HITACHI B50D MK Ⅲ 6×6 ARTICULATED DUMP TRUCK Service Repair Manual

B50D Mk III 6X6
ARTICULATED DUMP TRUCK
SERVICE MANUAL
Document Part Number 872152

TO THE SERVICE PERSONNEL
‹WARNING
Do not operate the machine unless you have read the Operator’s Manual and fully understand
how to operate the machine properly.
This manual is written for an experienced technician and are on-the-job guides containing only the vital
information needed for diagnosis, analyses, testing and repair. Essential tools required in performing
certain service works are identified and in this manual and are recommended for use.
The safe operation of your BELL EQUIPMENT machines very important to prevent any personal injury
and/ or damage. This manual must be read and fully understood before carrying out any tests on your
BELL EQUIPMENT machine.
Right and left hand sides are determined by facing in the direction of forward travel.
This manual is divided into chapters. The information contained in the manual is in logical sequence, with
the instructions written in step by step format.
Effective maintenance on your BELL EQUIPMENT machine is achieved when personnel fully understand
the information contained in this manual.
Every effort has been made to ensure that the information contained in this manual was correct at the
time of publication. BELL EQUIPMENT Co. has a policy of continuous product development,
improvement, and design. BELL EQUIPMENT Co. reserves the right to change, amend and update the
design of its product at any time without prior notice. With this policy, changes may have occurred that
are not included in this manual.

SAFETY SYMBOL
The following safety symbol is used for all safety messages. When you see the safety symbol, follow the
safety message to avoid personal injury or death.
WARNINGS and CAUTIONS must be read, fully understood and followed, before carrying out the action
or maintenance procedure concerned.
WARNINGS and CAUTIONS are always placed before any action or maintenance procedure where
personal injury and/or damage to the machine could occur if that action, test or maintenance procedure is
not carried out correctly.
WARNINGS and CAUTIONS are always placed before any action or maintenance procedure where
personal injury and/or damage to the machine could occur if that action or maintenance procedure is not
carried out correctly.
‹WARNING AND CAUTION SYMBOL
Throughout this manual the word WARNING is used to alert the operator and others of the risk of
personal injury during the operation of the equipment. CAUTION indicates the possible damage to the
machine. NOTE highlights information of special interest.
‹WARNING
Diesel engine exhaust and some of its constituents are known to the state of California to cause
Cancer, birth Defects and other Reproductive Harm.

B50D Mk III 6X6
ARTICULATED DUMP TRUCK
SERVICE MANUAL
Document Part Number 872152
Revision:0
Technical Documentation
BELL EQUIPMENT COMPANY
Richards Bay

IMPORTANT
Due to BELL EQUIPMENT’S policy of continuous product improvement, the information contained in this
manual was correct up to the time of printing (Revised date of manual). Any changes after this date will
only be included in the next update of this manual.
The illustrations in this manual are pictorial and not necessarily true representations of components.
Photographs and illustrations may show optional equipment.

ABBREVIATION LIST
The table below lists the abbreviations used in this manual:
Abbreviation Meaning
ºC degrees Celsius
ºF degrees Fahrenheit
A ampere
ADT Articulated Dump Truck
Ah ampere hours
CB circuit breaker
d diagnostic
D drive
DNS Do Not Shift
ECU Electronic Control Unit
FOPS Falling Objects Protective
Structure
ft foot (feet)
ft lb foot pound
HP Horsepower
ISO International Standards
Organisation
kg kilogram
km kilometre
km/hr kilometres per hour
kPa kilo pascal
kW kilowatt
lb pound
LCD Liquid Crystal Display
LED Light Emitting Diode
m³ cubic metre
N Neutral
m.p.h. miles per hour
MSDS Material Safety Data
Sheet
Abbreviation Meaning
Nm Newton metre
psi pounds per square inch
PTO Power Take-Off
R Reverse
r.p.m. revolutions per minute
ROPS Roll Over Protective
Structure
SMR Service Meter Reading
SS Single Speed
SSM Sealed Switch Module
USGAL United States Gallon
V Volt
yd³ cubic yard
OBW On Board Weighing
REVISION 0 7
B50D Mk III 6X6 ADT ABBREVIATIONS 872152

8 REVISION 0
872152 ABBREVIATIONS B50D Mk III 6X6 ADT

The table below is a record of amendments made to this manual after the publication date.
Amendment Record Sheet
Amendment
Page No’s.
Replaced
Date
Page amended/
Pages Inserted By
REVISION 0 9
B50D Mk III 6X6 ADT AMENDMENT 872152

10 REVISION 0
872152 AMENDMENT B50D Mk III 6X6 ADT

INTRODUCTION
‹WARNING
All specifications in this manual apply to a standard machine as supplied by the factory and any
modifications done to the machine such as greedy boards, etc. will result in different
specifications and we as OEM cannot take responsibility for this.
Read this manual carefully for it has been produced to assist you in the correct operation, maintenance
and care of your BELL EQUIPMENT machine. Failure to do so could result in personnel injury or
equipment damage.
Right and left hand sides are determined by facing in the direction of forward travel.
Warranty is provided as part of BELL EQUIPMENT’S support program for customers who operate and
maintain their equipment as described in this manual. The warranty is explained on the warranty
certificate which you should have received from your dealer.
Should the equipment be abused, or modified to change its performance beyond the original factory
specifications, the warranty will become void and field improvements may be denied.
This manual is divided into chapters. The information contained in the manual is in logical sequence, with
the instructions written in step by step format.
Effective maintenance on your BELL EQUIPMENT machine is achieved when personnel fully understand
the information contained in this manual.
Every effort has been made to ensure that the information contained in this manual was correct at the
time of publication. BELL EQUIPMENT Co. has a policy of continuous product development,
improvement, and design. BELL EQUIPMENT Co. reserves the right to change, amend and update the
design of its product at any time without prior notice. With this policy, changes may have occurred that
are not included in this manual.
Whilst every endeavour has been made to provide accurate and reliable information, BELL EQUIPMENT
Co. specifically disclaims any actual or implied warranty and under no circumstances shall be liable for
any loss, damage or injury to person or property suffered, whether direct, indirect or consequential,
arising from the use of this manual. In particular and without detracting from above, the disclaimer also
applies in the event of any specification, warning, or representation contained in this manual being
inadequate, inaccurate, or unintentionally misleading.
The user is urged to strictly comply with the instructions and warnings that are given in the interests of
general safety. Please do not hesitate to contact your BELL EQUIPMENT Product Support
Representative whenever you have a query on your BELL EQUIPMENT product or this manual.
REVISION 0 11
B50D Mk III 6X6 ADT INTRODUCTION 872152

12 REVISION 0
872152 INTRODUCTION B50D Mk III 6X6 ADT

SAFETY
SPECIFICATION
This machine complies to the CE Specification.
SAFETY FEATURES
1. ROPS/FOPS Cab Protection.
The Roll Over Protective Structure has been
certified to meet specified test requirements
according to SAE J1040 and ISO 3471. The
Falling Objects Structure has been certified
to meet specified test requirements
according to SAE J/ISO 3449 and ISO
3449.
2. Cab with Heater/Defroster.
Positive pressure ventilation system
circulates both outside and inside air
through filters for a clean working
environment. Built in defroster vents direct
air flow for effective window
de-fogging/de-icing.
3. Dump Body Service Lock.
4. Stop/Back lights. Highly visible lights.
5. Backup Alarm.
6. Independent Parking Brake.
7. Articulation locking Bar.
8. Secondary Steering.
Ground driven, continuously in operation.
Secondary steering indicator light will light
when activated.
9. Horn.
10. Halogen Lights and Turn Signals.
11. Engine Fan Guard.
12. By-pass Start Protection.
13. Exhaust Brake and Transmission
Retarder (If Equipped).
14. Safety Belt Retractors.
15. Mirrors.
16. Large Windshield Wiper With Washer.
REVISION 0 13
B50D Mk III 6X6 ADT SAFETY 872152
50D0004CV
12 14 16 15 12 11
10913876
5
4
3

MATERIAL SAFETY DATA SHEETS (MSDS)
The Federal Occupational, Safety and Health Administration (OSHA) Standard 29 CFR 1910.1200 and in
some cases, State and Local Right-to-Know laws, may require that specific MSDS be available to the
employees prior to operating this equipment. This may include information on substances contained in
this equipment such as antifreeze, engine oil, battery acid, hydraulic fluid and freon (if equipped with an
air conditioner).
To ensure a prompt response, please be sure to include your return address and ZIP (postal) code, along
with the model, serial number and/or VIN number of your machine.
UNAUTHORISED MODIFICATIONS OF THE ROLL OVER PROTECTIVE
STRUCTURE (ROPS) AND THE FALLING OBJECTS PROTECTIVE
STRUCTURE (FOPS)
Do not make unauthorised modifications or alterations to the ROPS and FOPS such as: welding on
extinguisher brackets, CB aerial brackets, fire suppression systems etc. Unauthorised modifications will
affect the structural limits of the ROPS and FOPS and will void the certification (and increase the risk of
an adverse safety incident.)
The Roll Over Protective Structure has been certified to meet specified test requirements according to
SAE J1040 and ISO 3471. The Falling Objects Protective Structure has been certified to meet specified
test requirements according to SAE J/ISO 3449 and ISO 3449, Level II.
Any planned modification or change must be reviewed in advance by the BELL EQUIPMENT
Engineering Department to determine if the modification or change can be made within the limits of the
certifying tests. It is important that each person in your organisation, including management, be made
fully aware of these rules involving ROPS and FOPS. Whenever anyone sees unauthorised modifications
or changes to a machine’s ROPS or FOPS both the customer and manufacturer must be notified in
writing. The protection offered by ROPS or FOPS will be impaired if they are subjected to structural
damage, is involved in an overturn incident, or is altered in any way and as such ROPS or FOPS must be
replaced, not reused.
LOOSENING OR REMOVAL OF THE ROLL OVER PROTECTIVE
STRUCTURE (ROPS) AND THE FALLING OBJECTS PROTECTIVE
STRUCTURE (FOPS)
Make sure that all parts are installed correctly if the ROPS or FOPS is loosened or removed for any
reason. Once the mounting bolt and nut assembly has been removed or loosened it must be replaced
with new parts as specified in the parts manual. Tighten the mounting bolts to the correct torque
specification as specified in the parts manual. Failure to comply could compromise product safety and
increase the risk to safety. A damaged ROPS or FOPS must be replaced, not reused.
NOISE EMISSION LEVELS
The sound pressure was tested according to ISO 6394 (SAE J/ISO 6394) and the sound power was
tested according to ISO 6393 (SAE J 2102).plain par
GENERAL SAFETY
Be sure all operators of this machine understand every safety message. Replace operator’s manual and
safety decals immediately if missing or damaged.
14 REVISION 0
872152 SAFETY B50D Mk III 6X6 ADT

SAFETY REGULATION
Every country (State) has its own safety
regulations. It is the obligation of the operator to
know and follow these. This also applies to local
regulations covering different types of work.
Should the recommendations in this manual
deviate from those of your country, your local
safety regulations should be followed.
Mounting And Dismounting The
Machine
Always use the handrails and steps provided to
get on and off the machine. Use both hands and
face the machine. Never get on or off a moving
machine. Never jump off the machine. Use a
hand line to pull equipment up onto the platform,
do not climb on or off the machine carrying tools
or supplies.
Use extra care when mud, snow, or moisture
present slippery conditions. Keep steps clean
and free of grease, oil and foreign objects.
Avoid Work Site Hazards
Avoid Overhead Power Lines
Never move any part of the machine within 4 m
(13 ft) plus twice the line insulator length, as
serious injury or death may result.
Operate Only On Solid Footing
Operate only on solid footing with strength
sufficient to support machine. Be alert working
near embankments, excavations and with bin
raised. Avoid working on surfaces that could
collapse under machine.
Use caution when backing up to berms before
dumping load.
Keep Riders Off the Machine
Do not allow unauthorised personnel on the
machine.
Prepare for Emergencies
Keep a first aid kit and fire extinguishers handy
and know how to use them. Inspect and have
your extinguisher serviced as recommended on
its instruction plate. Keep emergency numbers
for doctors, ambulance service, hospital and fire
department near your telephone.
REVISION 0 15
GD0014CFM
GD0015CFM
GD0017CFM

Avoid Backing Over Accidents
Make sure all persons are clear of machine path
before moving the machine. Where conditions
permit, raise bin for better visibility to the rear.
Use mirrors to assist in checking all round
machine.
Keep windows, mirrors and backup alarm clean
and in good condition.
Use a signal person when backing if view is
obstructed and/or in close quarters. Keep signal
person in view at all times.
Use prearranged hand signals to communicate.
Handle Chemical Products And Flammable
Fluids Safety
Exposure to hazardous chemicals can cause
serious injury. Under certain conditions,
lubricants, coolants, paints and adhesives used
with this machine may be hazardous.
If uncertain about safe handling or use of these
chemical products, contact your authorized
dealer for a Material Safety Data Sheet (MSDS).
Handle fuel with care, as it is highly flammable.
Do not smoke or go near an open flame or
sparks while refuelling. Always stop the engine
before refuelling the machine and fill the fuel tank
outdoors.
Keep all fuels and lubricants in properly marked
containers and away from all unauthorised
persons. Do not smoke in the storage areas.
Store oily rags and other flammable material in a
protective container, in a safe place.
Do not weld or flame cut pipes or tubes that have
contained flammable fluids. Clean them
thoroughly with nonflammable solvent before
welding or flame cutting them.
Starting fluid is highly flammable. Keep all sparks
and flames away when using it. To prevent
accidental discharge when storing the
pressurised can, keep the cap on the can and
store it in a cool protected place. Do not burn or
puncture a starting fluid container.
16 REVISION 0
GD0016CFM
GD0018CFM

Clean the Machine Regularly
Wait until the engine has cooled before removing
trash from areas such as the engine, radiator,
batteries, hydraulic lines, fuel tank and operators
cab. Remove any grease, oil or debris build-up.
Keep the machine, especially the walkways and
steps, free of foreign material, such as debris, oil,
tools and other items which are not part of the
machine.
Prevent Battery Explosions and Acid Burns
The standard battery supplied with the machine
is a sealed type that does not need maintenance.
Keep sparks and flames away from the batteries.
If a non-sealed battery is subsequently installed,
keep sparks and flames away from the batteries.
Use a flashlight to check the battery electrolyte
level. Use a voltmeter or hydrometer to check
battery charge. Never place a metal object
across the posts. Always remove the grounded
(Negative -) battery clamp first and replace it last.
Do not smoke in areas where batteries are being
charged.
Sulphuric acid in battery electrolyte is poisonous
and is strong enough to burn skin, eat holes in
clothing and cause blindness if splashed into the
eyes.
Avoid the hazard by:
• Filling the batteries in a well ventilated area.
• Wearing eye protection and rubber gloves.
• Avoid breathing fumes when electrolyte is
added.
• Avoid spilling or dripping electrolyte.
If you spill acid on yourself:
• Flush your skin with water.
• Apply baking soda or lime to help neutralise
the acid.
• Flush your eyes with water for 10 - 15 minutes
and get medical attention immediately.
If acid is swallowed:
• Drink large amounts of water or milk.
• Then drink milk of magnesia, beaten eggs, or
vegetable oil.
• Get medical attention immediately.
Wear Protective Equipment
Wear a hard hat, protective glasses and other
protective equipment as required by the job
conditions. Do not wear loose clothing or
jewellery that can catch on controls or other parts
of the machine.
When you drive connecting pins in or out, guard
against injury from flying pieces of debris by
wearing goggles or protective glasses. Prolonged
exposure to loud noise can cause impairment or
loss of hearing. Wear a suitable hearing
protective device such as earmuffs or earplugs.
Wear gloves when handling wire rope cable.
Use the Seat Belt
Use a seat belt at all times to minimise the
chance of injury in an accident.
The seat belt must not be altered or modified in
any way. Such changes can render the belt
ineffective and unsafe.
The seat belt is designed and intended for the
seat’s occupant to be of adult build and for one
occupant of the seat only.
REVISION 0 17
GD0019CFM
GD0013CFM

Avoid High Pressure Fluids
Escaping fluid under pressure can penetrate the
skin causing serious injury. Relieve the pressure
before disconnecting hydraulic or other lines.
Tighten all connections before applying pressure.
Keep hands and body away from pinholes and
nozzles which eject fluids under high pressure.
Use a piece of cardboard or paper to search for
leaks.
If any fluid is injected into the skin it must be
surgically removed within a few hours by a doctor
who is familiar with this type of injury or gangrene
may result.
Stay Clear Of Moving Parts
Entanglements in moving parts can cause
serious injury.
Stop engine before examining, adjusting or
maintaining any part of the machine with moving
parts.
Keep guards and shields in place. Replace any
guard or shield that has been removed for
access as soon as service or repair is complete.
Beware of Toxic Fumes
Prevent asphyxiation. Engine exhaust fumes can
cause sickness or death.
Operate only in well ventilated indoor areas.
Avoid hazardous fumes by first removing paint on
painted surfaces before welding.
Wear an approved respirator when sanding or
grinding painted surfaces.
If a solvent or paint stripper is used, wash surface
with soap and water. Remove solvent or paint
containers before welding and allow at least 15
minutes before welding or heating.
Dispose of Waste Properly
Improper disposal of waste can threaten the
environment. Fuel, oils, coolants, filters and
batteries used with this machine may be harmful
if not disposed of properly.
Never pour waste onto the ground, down a drain
or into any water source.
Air conditioning refrigerants can damage the
atmosphere. Government regulations may
require using a certified service centre to recover
and recycle used refrigerants.
If uncertain about the safe disposal of waste,
contact your local environmental centre or your
dealer for more information.
Start Only From Operator’s Seat
‹WARNING
Never turn the ignition switch On and
immediately OFF again. This will reset the
cranking time and damage to the starter
motor can occur.
Avoid unexpected machine movement. Start
engine only while sitting in operator’s seat.
Ensure all controls and working tools are in
proper position for a parked machine.
18 REVISION 0
GD0020CFM
GD0022CFM

Never attempt to start engine from the ground.
Do not attempt to start engine by shorting across
the starter solenoid terminals.
Lower bin during work interruptions, apply park
brake and be careful not to accidentally actuate
controls when co-workers are present.
Operating The Machine
Avoid Tip Over
Use safety belt at all times. Do not jump from
machine if it tips.
Use extra care when bin is raised. Machine
stability is greatly reduced when bin is raised.
Drive slowly, avoid sharp turns and uneven
ground.
Do not over load the machine.
Before operating machine after it has tipped,
carefully inspect all hydraulic and electrical lines.
Operating on Slopes
Avoid side slope travel whenever possible.
Check service brakes frequently when operating
on slopes.
The maximum slope will be limited by the ground
conditions.
Welding Repairs
NOTE: Disable electrical power before
welding. Turn off main battery switch or
disconnect positive battery cable. Separate
harness connectors to engine, alternator and
machine microprocessors.
Avoid welding near fluid lines. Do not let heat go
beyond work area near fluid lines.
Remove paint properly. Wear eye protection and
protective equipment when welding.
Do not inhale dust or fumes.
REVISION 0 19
GD0023CFM
GD0021CFM

Tyre Information
Welding or heating of the rim components, external fire or excessive use of brakes can cause overheating
of the tyres, which could cause a tyre explosion.
This explosion can propel the tyre, rim and final drive components approximately 500 metres (1 640ft)
from the machine, which may cause personal injury or death and/or property damage.
If the tyre is overheating and could explode, do not approach it within the area represented by the shaded
area in the drawing, until it has cooled.
Stand behind the tread and use a self attaching chuck with extension hose to inflate the tyres. Use a
safety cage if available. Do not stand over the tyre.
NOTE: It is recommended that only trained personnel service and change tyres and rims.
Inspect and Maintain ROPS
A damages roll-over protective structure (ROPS) should be replaced, not reused.
If the ROPS was loosened or removed for any reason, inspect it carefully before operating the machine
again.
To Maintain the ROPS:
• Replace missing hardware using correct grade hardware.
• Check hardware torque.
• Check isolation mounts for damage, looseness or wear; Replace if necessary.
• Check ROPS for cracks or physical damaged.
Drive Metal Pins
Always wear protective goggles or safety glasses and other safety equipment.
Use soft hammer or a brass bar between hammer and object to prevent chipping.
20 REVISION 0
500 m
(1 640 ft)
15 m
(49'3")
Use a safety cage if available
Do not stand over the tyre, use a clip-on chuck and extension hose
GC0002FM

SAFETY DECALS
There are several safety decals on your BELL EQUIPMENT machine. Their exact location and
description of the hazard are reviewed in this section. Please take the time to familiarise yourself with
these safety decals.
Keep the decals clean by using a soft cloth, water, and soap. Do not use solvent, gasoline, etc. You must
replace a decal if it is damaged, missing or cannot be read. If a decal is on a part that is replaced, ensure
a new decal is installed on the replacement part. Contact your BELL EQUIPMENT Representative for
new decals.
REVISION 0 21
This instructional seat has been provided only
for training operators or to diagnose machine
problems. Keep all other riders off this
machine. Always wear your seat belt.
CAUTION
207339-aFM
Located inside the cab
on the rear panel
207307FM
CAUTION
AVOID DEATH OR SERIOUS INJURY
*READ AND UNDERSTAND OPERATOR’S MANUAL BEFORE OPERATING
*THIS MACHINE.
*OPERATE ONLY FROM THE OPERATOR’S SEAT.
*BEFORE LEAVING SEAT: LOWER BODY TO FRAME REST.
PLACE TRANSMISSION IN NEUTRAL.
APPLY PARK BRAKE.
STOP ENGINE (TURN KEY SWITCH TO OFF).
*DO NOT PERMIT RIDERS.
*AVOID CONTACT WITH OVERHEAD OBSTACLES WHEN OPERATING OR
*HAULING THE TRUCK.
*USE EXTRA CARE TO AVOID TIP-OVER WHEN DUMPER BODY IS RAISED.
on the roof panel
Located on both sides
of the front chassis
Located on
both sides
of the
front chassis
COMPRESSED AIR
RESERVOIR
Avoid injury, drain
completely before carrying
out maintenance.
Typical working pressure:
800 kPa (116 PSI).
WARNING
207349-AFM
Located on the air reservoir
Located on the side of the machine
and suspension struts
Located on the inside of the rear chassis
Located inside
the cab next
to the park brake
Located on the
silencer heat
shield
Located on the
silencer heat
shield
Located on the inside of the front chassis
Located on the chassis
underneeth the cabWARNING
AVOID INJURY
Ensure propshaft
guards are in
place at all times
207330FM
Ensure that the cab
support is properly
engaged before
carrying out any
maintenance in this
area. 207383FM
WARNING
WARNING
Read the manual
before carrying out
maintenance in this
area
SPRING UNDER
PRESSURE
207350FM
WARNING
207338FM
AVOID SERIOUS
INJURY
Block wheels to
prevent machine
movement before
deactivating park
brake for towing.
WARNING
Torque all wheel
nuts to 650 N.m
[480 LB.FT.] after
the first 5 hours
and then again
after 50 hours.
Repeat this
procedure if
wheels are
changed.
207295FM
CAUTION
BEFORE WELDING ON THIS UNIT:
To avoid control circuit damage:
1.Turn the electrical disconnect
switch to “OFF”.
2. Make sure the vehicle ground straps
are properly installed.
3.The welding ground clamp must
have a good connection to the
machine structure and close to the
point of weld.
4. Attach welding ground clamp directly
to structure before welding.
50D0013CV
WARNING
HIGH PRESSURE
HYDRAULICS
See manual for correct
maintenance procedure.
Typical working
pressure: 8000 kPa
(1160 PSI). 207329FM
WARNING
217486V
CRUSHING INJURY
* Do not disconnect / loosen any of
the suspension hoses until the
pressure in the system has been
released.
* Front chassis could ‘sag’ slowly
after the engine has been switched
off.
* Refer to Operator’s Manual for the
correct removal, installation and
maintenance procedure of the
suspension hoses in this area.
WARNING
CRUSHING INJURY
Do not touch or move
the Height Sensor
when the ignition is on.
Refer to Operator’s
Manual.
217487V

Refer to Operator's or Parts Manuals for details
of decals.
22 REVISION 0
50D0014CFM
Located on the starter
Located in the engine
compartment on the
cab tilt pump
Located in the engine
compartment on the
fan cowling
Located on both sides of
the rear chassis
Located on both sides of
the articulation joint
Located inside
the cab on the
rear pillar
Located inside
the cab on the
rear pillar
Located inside
the cab next to
the gear shift
control
Located inside
the cab on the
right hand side
window
Located on the suspension
cylinders
Located on the rear
of the machine & on
the sides of the machine
WARNING
Avoid crushing
Do not jump
if machine tips
USE
SEAT
BELT
207192FM
WARNING
Crushing injury may result in
hinge area if machine is turned.
Make sure people are clear of
machine before starting engine
or moving steering wheel.
Attach locking bar before
performing service near center
of machine or transporting on
a truck.
207336FM
WARNING
207337FM
STAY CLEAR
OPERATOR MAY
REVERSE
MACHINE.
To avoid injury or
death, install bin
support pole before
carrying out any
maintenance in
this area 207351FM
DANGER
207191FM
DANGER
Serious injury or
death can result
from contact with
electric lines.
Never move any
part of unit or load
closer than:
3m[10FT] plus twice
the line insulator
length to an
electric line.
WARNING
AVOID INJURY
Keep clear
of rotating
fan blades
207331FM
CAB TILT PROCEDURE
IMPORTANT
Raising:
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
Lowering:
1
2.
3.
4.
5.
6.
7.
Park truck on level ground with body lowered. Engage
park brake.
Turn ignition switch off. Turn battery disconnect switch off.
Remove 2 retaining bolts per left hand side rubber cab
mounting.
Close cab and right hand side external compartment
doors. Mirrors to be in normal operating position.
Insert tilt pump lever into the pump.
Put directional valve lever in “Cab Raise” position.
Pump until cab is tilted to the up position.
Slowly rotate directional valve clockwise towards “Cab
Lower” position while pressing the strut handle towards
the engine compartment.
Ensure the cab support sliding bolt is properly locked into
the slot notch profile.
Place tilt pump lever in “Cab Raise” position.
.Ensure the cab area is free of obstacles.
Directional valve lever to be in “Cab Raise” position.
Ensure conditions apply as per 4 above.
Pump cab upward until peg has disengaged from
support strut slot.
Slowly rotate directional valve lever clockwise, while
pulling strut handle away from engine compartment,
lowering cab until properly seated.
Install and torque new locking bolts. Refer to operator
manual and parts manual for correct fastener and torque
specifications.
Ensure directional valve lever is in “Cab Lower” position.
207382-BFM
DANGER
207408FM
Start only from
seat in park or
neutral.
Starting in gear
kills.
EMERGENCY EXIT
Use tool to break window
207411FM
IMPORTANT
IMPORTANT
Neutral to forward or reverse
shifts are automatically prevented
at high engine speeds. Reduce
engine speed to below 900 rpm
to allow neutral to forward or
reverse shift.
207385-AFM
WARNING
HIGH PRESSURE
HYDRAULICS
See manual for correct
maintenance procedure.
Typical working
pressure: 8000 kPa
(1160 PSI).
207329
WARNING
ROLLOVER (ROPS) AND
FALLING OBJECT (FOPS)
PROTECTIVE STRUCTURE
CERTIFICATION
BELL EQUIPMENT C0. S.A.
(PTY) LTD
RICHARDS BAY
SOUTH AFRICA
208645
Any alteration, modification,
repair, structural damage or
an overturn reduces this
structure’s protective
capabilities and invalidates
this certification. Consult
the manufacturer to
determine this structure’s
limitations.
Performance certified at
date of manufacture to:
PROTECTIVE STRUCTURE
PART NUMBERS:
262796
CERTIFIED ARTICULATED
DUMP TRUCK MODELS:
B50D
ROPS:
SAE J 1040: 1994
FOPS:
SAE J/ISO 3449: 1998
ISO 3471: 2000
ISO 3449: 1992
CERTIFIED PRIME MOVER
MASS:
15750 Kg (34722 Lbs.)

BULLETINS
Record the relevant information from the Technical Documentation Bulletins, Service Bulletins and Parts
Bulletins into this manual as follows:
Ensure the manual number (87————) reflected in the bulletin is the same as the 87——— number at
the top of the main content pages.
Carry out the instructions as detailed in the bulletin.
Record the required information below.
File the bulletins in numerical order in a suitable 3 or 4 ring binder.
TECHNICAL DOCUMENTATION BULLETIN RECORD
BULLETIN No. SUBJECT
INSERTED BY
NAME SIGNATURE DATE
REVISION 0 23
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TECHNICAL DOCUMENTATION BULLETIN RECORD
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or omissions, then we would like to know.
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REVISION 0 25
B50D Mk III 6X6 ADT FEEDBACK 872152

26 REVISION 0
872152 FEEDBACK B50D Mk III 6X6 ADT

TABLE OF CONTENTS
SAFETY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
SAFETY FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
GENERAL SAFETY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
SAFETY REGULATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
SAFETY DECALS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
CHAPTER 1. OPERATIONAL CHECK-OUT PROCEDURE . . . . . . . . . . . . . . . . . . . . 39
OPERATIONAL CHECK-OUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
OPERATIONAL CHECKS - KEY SWITCH ON, ENGINE OFF . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
CHAPTER 2. ENGINE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
SECTION 1. THEORY OF OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
ENGINE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45
SECTION 2. DIAGNOSE ENGINE MALFUNCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
SECTION 3. ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
DISPLAY MENU TACHOMETER. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51
SLOW AND FAST IDLE ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51
VALVE CLEARANCE ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51
EXHAUST BRAKE ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53
SECTION 4. TESTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
CYLINDER COMPRESSION TEST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55
FUEL PUMP PRESSURE TEST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55
OIL PUMP PRESSURE TEST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57
CAN BUS J1939. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60
WHAT EXACTLY IS A “CAN BUS” . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60
CANBUS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .61
TESTING THE “CANBUS” . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .62
CHECKING THE CABLES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .62
CHECKING OPENS, SHORTS BETWEEN WIRES AND SHORTS TO GROUND ON THE CAN
HARNESS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .63
MAIN “CAN” HARNESS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .63
“CAN” SHORT TO GROUND. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64
“CAN “OPEN CIRCUIT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65
“CAN” SHORT TO POSITIVE 0 -24 VOLTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .66
REVISION 0 27

CHAPTER 3. ELECTRICAL SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
SECTION 1. SYSTEM INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
ELECTRICAL SCHEMATIC SYMBOLS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67
CHASSIS CONTROL UNIT (CCU & OEU) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .68
MDU2 (MONITOR DISPLAY UNIT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .69
MDU2 LAYOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .70
MDU2 INPUT AND OUTPUTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .71
RELAY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .73
START-UP DISPLAY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .74
DEFAULT SCREEN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .74
DEFAULT SCREEN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .74
DEFAULT SCREEN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .74
DEFAULT SCREEN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .74
DEFAULT SCREEN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .75
TO GO TO MAIN MENU FROM DEFAULT SCREEN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .75
MAIN MENU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .75
EXPLANATION OF WIRE MARKINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .80
SECTION 2. DESCRIPTION OF CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
SSM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .125
MDU2 WARNING LIGHTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .136
MDU2 GAUGES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .140
CCU2 OUTPUT SPECIFICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .141
OEU OUTPUT SPECIFICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .145
SECTION 3. REFERENCES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149
ENGINE FAULT CODES (ADM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .149
ENGINE FAULT CODES (PLD-MR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .154
SSM FAULT CODES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .180
PART 2. DM1 FAULT CODES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .181
SECTION 4. TESTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 199
KEY SWITCH TEST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .199
RELAYS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .199
Diode Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .200
Pneumatic System Solenoids, Pressure Switches, and Sensor Tests . . . . . . . . . . . . . . . . . . . . . . 201
Steering Column Switch Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .206
TABLE OF CONTENTS
28 REVISION 0

CHAPTER 4. TRANSMISSION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 219
SECTION 1. THEORY OF OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 219
GENERAL DESCRIPTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .219
STALL SPEEDS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .226
PLANETARY GEARS AND POWER FLOWS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .228
THE BASIC LAWS OF PLANETARY GEAR SETS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .229
HD TRANSMISSION PLANETARY CONFIGURATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .230
HD TRANSMISSION CLUTCH CONFIGURATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .231
POWER FLOW. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .232
HYDRAULIC SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .241
SOLENOIDS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .245
3000 and 4000 4th Generation Control Valve Body. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .246
HYDRAULIC CIRCUITS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .248
TORQUE CONVERTER AND LUBE PRESSURE CIRCUITS - OVERVIEW . . . . . . . . . . . . . . . . . 256
EXHAUST BACKFILL PRESSURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .257
PRESSURE TABLE AND TEST POINTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .262
RETARDER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .263
APPLICATIONS AND CAPACITIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .263
INPUTS AND OUTPUTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .265
RETARDER CONTROL HYDRAULICS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .265
TESTING RETARDER CHARGING PRESSURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .266
HD RETARDER HYDRAULIC SCHEMATIC RETARDER OFF . . . . . . . . . . . . . . . . . . . . . . . . . . .267
HD RETARDER HYDRAULIC SCHEMATIC RETARDER ON . . . . . . . . . . . . . . . . . . . . . . . . . . . .268
ELECTRONIC CONTROL SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .269
PUSH BUTTON SHIFT SELECTOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .273
SPEED SENSORS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .274
WIRING HARNESSES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .274
RANGE / SHIFT TESTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .275
DO NOT SHIFT LIGHT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .276
SECTION 2. DIAGNOSTIC INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 278
DIAGNOSTIC PROCEDURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .278
DIAGNOSE POWER TRAIN SYSTEM MALFUNCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .279
CHECK THE TRANSMISSION FLUID LEVEL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .290
TRANSMISSION CONTROL UNIT ERROR CODES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .293
REVISION 0 29
TABLE OF CONTENTS

TABLE OF ERROR CODES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 294
ALLISON HD 4560R ELECTRONIC CONTROL WTEC III . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .300
SECTION 3. ADJUSTMENTS AND TESTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 301
TRANSMISSION WARM-UP PROCEDURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .301
TRANSMISSION OIL COOLER RESTRICTION TEST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .310
CHAPTER 5. PNEUMATIC SYSTEM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 311
PNEUMATIC SYSTEM OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .311
PNEUMATIC SYSTEM SCHEMATIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .312
DIAGNOSE PNEUMATIC SYSTEM MALFUNCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .322
SECTION 3. ADJUSTMENTS AND TESTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 324
PNEUMATIC SYSTEM MAIN PRESSURE TEST AND ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . 324
PARK BRAKE PRESSURE TEST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .325
PARK BRAKE ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .326
GRAMMER SEAT FUNCTIONAL TEST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .328
CHAPTER 6. HYDRAULIC SYSTEM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 329
ARTICULATED DUMP TRUCK HYDRAULIC SYSTEM OPERATION . . . . . . . . . . . . . . . . . . . . . . 329
DIAGNOSE HYDRAULIC SYSTEM MALFUNCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .360
SECTION 3. TESTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 371
JT05800 DIGITAL THERMOMETER INSTALLATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .371
JT02156A DIGITAL ANALOGUE PRESSURE/TEMPERATURE ANALYSER INSTALLATION. . . 371
HYDRAULIC OIL CLEANUP PROCEDURE USING PORTABLE FILTER CADDY . . . . . . . . . . . . 371
HYDRAULIC SYSTEM WARM-UP PROCEDURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .372
CYCLE TIME TEST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .373
MAIN HYDRAULIC PUMP RESIDUAL AND COMPENSATOR VALVES TEST AND ADJUSTMENT
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .374
SYSTEM RELIEF VALVE AND BIN RAISE CIRCUIT RELIEF VALVE TEST. . . . . . . . . . . . . . . . . 376
PRIORITY VALVE TEST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .377
ACCUMULATOR PRESSURE REDUCING VALVE TEST AND ADJUSTMENT . . . . . . . . . . . . . . 377
BRAKE ACCUMULATOR CHARGE VALVE TEST AND ADJUSTMENT. . . . . . . . . . . . . . . . . . . . 378
BRAKE LOW PRESSURE SWITCH AND BRAKE ACCUMULATOR TEST. . . . . . . . . . . . . . . . . . 379
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FRONT AND REAR BRAKE ACCUMULATORS PRESSURE TEST AND CHARGE PROCEDURE
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .380
SERVICE BRAKE VALVE TEST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .382
STEERING RELIEF VALVE PRESSURE TEST AND ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . 383
STEERING CYLINDER LEAKAGE TEST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .383
SECONDARY STEERING PUMP RESIDUAL AND COMPENSATOR VALVES TEST AND
ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .384
BIN LOWER CIRCUIT RELIEF VALVE TEST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .385
SUSPENSION CALIBRATION PROCEDURE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .386
SUSPENSION SERVICE CHECK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .387
Hydraulic Pressure Setting and Fault Finding Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .390
CHAPTER 7. HEATING AND AIR CONDITIONING . . . . . . . . . . . . . . . . . . . . . . . . . 403
AIR CONDITIONING SYSTEM CYCLE OF OPERATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .403
HEATER CORE OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .404
DIAGNOSE AIR CONDITIONING SYSTEM MALFUNCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . .405
HEATING/AIR CONDITIONING COMPONENT LOCATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .407
SECTION 3. TESTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 409
AIR CONDITIONING OPERATIONAL CHECKS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .409
R134A AIR CONDITIONING SYSTEM TEST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .410
OPERATING PRESSURE DIAGNOSTIC CHART. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .411
A/C FREEZE CONTROL SWITCH TEST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .413
A/C COMPRESSOR CLUTCH TEST. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .413
A/C HIGH/LOW PRESSURE SWITCH TEST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .413
A/C EXPANSION VALVE TEST. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .414
EXPANSION VALVE BENCH TEST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .415
REFRIGERANT LEAK TEST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .416
CHAPTER 8. MAINTENANCE SCHEDULES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 419
NOTES:. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .421
CHAPTER 9. DAILY OR 10 HOURLY SERVICE CHECKS. . . . . . . . . . . . . . . . . . . . 423
CHAPTER 10. 500 HOURS SERVICE AND CHECKS . . . . . . . . . . . . . . . . . . . . . . . 425
SECTION 1. DRIVE TRAIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 425
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .425
SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .425
ENGINE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .425
TRANSMISSION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .428
BRAKES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .431
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AXLES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .431
TRANSFER CASE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .432
SECTION 2. CLEAN, CHECK AND REPLACE BREATHERS . . . . . . . . . . . . . . . . . . . . . . 433
GENERAL CHECK DRIVE LINE & SUSPENSION FASTENERS. . . . . . . . . . . . . . . . . . . . . . . . . .433
TRANSMISSION BREATHER (LOCATED UNDER CAB). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .433
REPLACE FUEL TANK BREATHER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .433
TRANSFER CASE BREATHER (LOCATED BEHIND CAB). . . . . . . . . . . . . . . . . . . . . . . . . . . . . .433
AXLE BREATHERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .434
SECTION 3. CAB AND ELECTRICAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 435
INSPECT, CLEAN AND REPLACE CAB AIR FILTER. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .435
CHECK BATTERIES, CLEAN AND TIGHTEN TERMINALS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .436
CHECK ELECTRICAL CONNECTORS, HARNESSES AND LOOMS . . . . . . . . . . . . . . . . . . . . . . 436
CHECK WORK LIGHTS, REVERSE BUZZER AND HORNS . . . . . . . . . . . . . . . . . . . . . . . . . . . . .436
RECORD & DELETE FAULT CODES ON THE MDU. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .436
CHECK THE OPERATOR CONTROLS AND INSTRUMENTS. . . . . . . . . . . . . . . . . . . . . . . . . . . .436
SECTION 4. LUBRICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 437
CHECK GREASE LEVEL OF AUTO GREASING SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .437
REPLACE AUTO GREASING SYSTEM FILTER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .437
HYDRAULICS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .438
CHAPTER 11. 500 HOURS SERVICE AND CHECKS . . . . . . . . . . . . . . . . . . . . . . . 441
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .441
ENGINE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .441
TRANSMISSION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .442
BRAKES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .445
TRANSFER CASE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .445
SECTION 2. CLEAN, CHECK AND REPLACE BREATHERS . . . . . . . . . . . . . . . . . . . . . . 447
GENERAL CHECK DRIVE LINE & SUSPENSION FASTENERS. . . . . . . . . . . . . . . . . . . . . . . . . .447
TRANSFER CASE BREATHER (LOCATED UNDER THE CAB) . . . . . . . . . . . . . . . . . . . . . . . . . .447
AXLE BREATHERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .447
SECTION 3. CAB AND ELECTRICAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 449
INSPECT, CLEAN AND REPLACE CAB AIR FILTER. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .449
CHECK BATTERIES, CLEAN AND TIGHTEN TERMINALS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .450
CHECK ELECTRICAL CONNECTORS, HARNESSES AND LOOMS . . . . . . . . . . . . . . . . . . . . . . 450
CHECK WORK LIGHTS, REVERSE BUZZER AND HORNS . . . . . . . . . . . . . . . . . . . . . . . . . . . . .450
RECORD & DELETE FAULT CODES ON THE MDU. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .450
CHECK THE OPERATOR CONTROLS AND INSTRUMENTS. . . . . . . . . . . . . . . . . . . . . . . . . . . .450
SECTION 4. LUBRICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 451
CHECK GREASE LEVEL OF AUTO GREASING SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .451
REPLACE AUTO GREASING SYSTEM FILTER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .451
HYDRAULICS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .452
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CHAPTER 12. 1 000 HOURS SERVICE AND CHECKS . . . . . . . . . . . . . . . . . . . . . . 455
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .455
Engine. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .455
SECTION 2. HYDRAULICS AND LUBRICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 459
REPLACE HYDRAULIC RESERVOIR BREATHER. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .459
SECTION 4. AXLES AND CHASSIS & SUSPENSION. . . . . . . . . . . . . . . . . . . . . . . . . . . . 461
CHECK AXLE OIL LEVEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .461
CHECK FINAL DRIVE OIL LEVELS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .461
CHECK BIN SHOCK PAD CLEARANCE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .461
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .463
ENGINE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .463
SECTION 2. HYDRAULICS AND LUBRICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 467
REPLACE HYDRAULIC OIL RETURN FILTER. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .467
SECTION 3. CAB, PNEUMATICS AND ELECTRICAL . . . . . . . . . . . . . . . . . . . . . . . . . . . 469
REPLACE PNEUMATIC SYSTEM DRYER FILTER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .469
DRYER FILTER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .469
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .471
SECTION 2. HYDRAULICS AND PNEUMATICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 473
SECTION 1. DRIVE TRAIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 475
REPLACE FAN BELT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .475
SECTION 2. HYDRAULICS AND PNEUMATICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 477
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .477
CHAPTER 16. AS REQUIRED SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 479
SECTION 1. ENGINE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 479
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INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .479
SECTION 2. CAB AND LUBRICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 483
CLEAN AIR CONDITIONING FILTERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .483
GREASE HINGES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .483
CHAPTER 17. MISCELLANEOUS SERVICE AND CHECKS . . . . . . . . . . . . . . . . . . 485
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .485
ENGINE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .485
WHEELS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .485
SECTION 2. ELECTRICAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 487
USING BATTERY CHARGER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .487
ADJUST HEADLIGHTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .489
SECTION 3. OPERATIONAL CHECKOUT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 493
OPERATIONAL CHECK-OUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .493
CHAPTER 18. TROUBLE SHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 501
SECTION 1. SYMPTOMS AND REMEDIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 501
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .501
CHAPTER 19. APPENDIX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 513
OBW Functional Description – ADT Mk IV
001-4002-00. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 513
HYDRAULIC FAN COOLER FUNCTIONAL DESCRIPTION – ADT MK IV
001-4003-02. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 516
TABLE OF CONTENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .516
1. INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .516
2. CHASSIS CONTROL UNIT SOFTWARE REQUIREMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . .516
CCU2 HEADLIGHT LOGIC AND CONTROL
001-4004-00. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 519
1. INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .519
2. HEADLIGHT LOGIC AND CONTROL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .519
CCU2 WIPER CONTROL LOGIC
001-4005-00. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 521
1. INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .521
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2. WIPER CONTROL LOGIC AND TIMING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .521
AIR-CONDITIONING CONTROL LOGIC
001-4006-00. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 523
1. INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .523
2. INPUTS/OUTPUTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .523
BIN CONTROL LOGIC
001-4007-00. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 525
1. INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .525
2. BIN CONTROL LOGIC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .525
PR001_PARK BRAKE FUNCTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 529
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .529
REVISION 0 35
B50D Mk III 6X6 ADT CHAPTER 10 872152

CHAPTER 1. OPERATIONAL CHECK-OUT PROCEDURE
OPERATIONAL CHECK-OUT
Use this procedure to check operation of the machine. This procedure is designed so you can make a
quick check of the machine operation while performing specific checks from the operator’s seat.
Should you experience a problem with the machine, you will find helpful diagnostic information in this
check-out that will help pinpoint the cause.
A location will be required which is level and has adequate space to perform the check-out procedure. No
tools or equipment are required to perform the check-out procedure.
Compete the necessary visual checks (oil levels, oil condition, external leaks, loose hardware, linkages,
wiring, etc.) prior to doing the operational check-out. The machine must be at operating temperature for
many of the checks.
Start at the top of the left column and read completely down column before performing check. Follow this
sequence from left to right. In the far right column, if no problem is found, you will be instructed to go to
next check. If a problem is indicated, you will be referred to either a chapter in this manual for specific test
or the repair manual for repair procedure.
OPERATIONAL CHECKS - KEY SWITCH ON, ENGINE OFF
Turn battery disconnect switch ON. Turn key switch to ON position.
CHECKS QUESTIONS/TASKS RESULTS
Gauges and
Indicator Lights
Do all indicator lights come ON or flash?
Do all gauges and speedometer move to centre position?
Do all sections of monitor liquid crystal display’s appear?
Does audible alarm come ON?
NOTE: 1. Cold start indicator light will remain ON for a
maximum of 20 seconds in low ambient temperature
conditions.
2. Air pressure indicator (1) on the numerical display
screen may remain ON, depending on system air pressure.
Do all gauges and displays return to normal operation mode
and audible alarm go OFF after 3 seconds?
Do all indicator lights, except for secondary steering (marked
emergency steering), battery charge and park brake to go
OFF and low brake accumulator brake pressure, depending
on the pressure in the accumulator?
YES: Go to next
check.
NO: Check circuit
breakers and
fuses. Reset circuit
breakers and/or
replace fuses as
necessary.
Check indicator
light bulbs.
Replace if
necessary.
Go to (“Menu
Display Unit”.
REVISION 0 39

Transmission
Shift Control
Does shift control operate correctly? YES: Go to next
check.
NO: Replace
transmission shift
control.
Gauges and
Indicator Lights
Start engine.
NOTE: 1. Low air pressure alarm will be ON until air
pressure reaches normal operating pressure.
2. Transmission oil temperature gauge will not begin to
indicate temperature until transmission oil is close to
operating temperature.
Do all indicator lights, except park brake indicator light, go
OFF after the engine starts?
Does the Menu Display Unit display engine speed?
Does engine oil pressure gauge display engine oil pressure?
Does the needle of the gauge indicates pressure is
increasing to green (Normal)?
Check the air pressure gauge immediately after the engine
has started.
Does the needle of the gauge indicates pressure is
increasing to green (Normal)?
YES: Go to next
check.
NO: Go to (“Menu
Display Unit”.
Service Brake
Accumulator
Apply brakes repeatedly until main hydraulic pump strokes to
charge accumulators. When accumulators are fully charged,
pump will de-stroke. Turn engine “OFF”.
Turn key switch “ON” again and wait for indicator lights to go
“OFF”
Apply the service brakes, counting the number of applications
until the accumulator low pressure light illuminates.
YES: Go to next
check.
NO: Go to (“Font
And Rear Brake
Accumulators
Pressure Test
And Charge
Procedure”.
Service Brake NOTE: Perform this check in an open area where machine
can travel at full speed.
Drive machine slowly.
Apply brake pedal to stop machine.
Release the brake pedal.
Does brake pedal push easily without binding?
Does brake pedal return to the released position so brakes
are not dragging?
Do brakes stop machine in a reasonable distance without
pulling to one side or making noise?
Drive machine at full speed.
Release accelerator and apply brake pedal to stop machine.
Do brakes stop machine in a reasonable distance without
pulling to one side or making noise?
YES: Go to next
check.
NO: Go to
(“Service Brake
System
Malfunction”.
40 REVISION 0
872152 CHAPTER 1 B50D Mk III 6X6 ADT

Park Brake
‹CAUTION
Machine will stop abruptly during this check. Fasten seat
belt. Perform check in open area.
From an initial start up, if the air pressure was below 6 bar,
the park brake needs to be released, applied and released
again.
Start engine.
Switch park brake switch "OFF"
Drive machine at slow idle in 1 st gear at ~ 4 km/h (2.5
m.p.h.). Switch park brake "ON".
Does park brake indicator light illuminates?
Does the park engages and machine stops
YES: Continue
check.
NO: Go to
(“Diagnose
Power Train
System
Malfunction”.
With engine “ON”, transmission in “N” (Neutral) and park
brake “ON” switch park brake switch "OFF".
Shift transmission to “D” (Drive).
Slowly increase engine speed.
Does machine move when engine speed is just above slow
idle?
Return engine to slow idle.
Shift transmission to “N” (Neutral).
YES: Continue
check.
NO: Go to
(“Diagnose
Power Train
System
Malfunction”.
Steering Park machine in an open area, on a hard level surface.
Turn inter-axle switch to the “OFF” position. Ensure that the
inter-axle lock switch is in the “OFF” position and the IDL
light on the MDU is “OFF”.
Release park brake.
Release service brakes.
Run engine at slow idle.
Turn steering wheel fully left and then fully right.
Does machine turn smoothly in both directions.
YES: Continue
check.
NO: Go to
(“Steering
System
Malfunction”.
Run engine at fast idle.
Turn steering wheel fully left then right.
Does machine turn smoothly in both directions.
YES: Continue
check.
NO: Go to
(“Steering
System
Malfunction”.
REVISION 0 41

Bin
‹CAUTION
Avoid possible serious injury from machine movement.
Clear area of all bystanders before performing test. Area
must have enough overhead clearance to raise bin to full
height of 6207 mm (20 ft. 4 in.). Do not perform this test
within 4 m (13ft.) of high voltage power lines.
Perform this check in an open area, clear of bystanders.
Position the machine frames straight.
Operate the engine at 1500 r.p.m.
Pull bin control lever rearward to raise bin.
When bin is almost complete up, reduce engine speed to
slow idle.
Does bin raise to full height smoothly?
YES: Continue
check.
NO: Go to
(“Hydraulic
System
Malfunctions”.
Release bin control lever.
Does bin control lever return to neutral position?
YES: Continue
check.
NO: Go to bin
Control Valve
Operation. (See
Chapter 21,
SECTION 1,
Repair Manual)
Push bin control lever to full forward detent bin float position
and release lever.
Does the control lever stay in the float position until the last
5% (3.5°) of body travel, at which time the lever returns to
neutral position?
Dos bin lower to full down position smoothly?
YES: Go to next
check.
NO: Go to (“Bin
Control Circuit”.
Viscous Fan
Drive
NOTE: Engine must be cool or fan may not turn freely by
hand.
Allow engine to cool.
Turn fan by hand, feel for rough bearing or fan not turning
freely.
Does fan turn freely and smoothly?
Start engine and run 2 -3 minutes.
Check that fan turns at near engine speed, then slows down.
As engine warms to normal operating temperature, fan will
speed up to near engine speed.
Does fan speed increase as engine warms?
Turn engine “OFF”
YES: Do to next
check.
NO: Replace
viscous fan drive.
42 REVISION 0

Exhaust Smoke Start engine and allow to warm to normal working
temperature.
Operate machine under full load at fast engine speed.
Observe exhaust colour.
No smoke is normal.
Blue smoke indicates faulty or stuck piston rings.
White or grey smoke indicates stuck piston rings, fuel cetane
too low or engine running too cold.
Heavy black smoke indicates injection nozzles faulty, engine
injection system incorrect, fuel cetane to low or air filter
element clogged.
Is engine exhaust smoke normal colour?
YES: Continue to
next check.
NO: Go to
(“Diagnose
Engine
Malfunctions”.
Engine Speed Start engine and warm to normal operating temperature.
Run engine at low idle; Record r.p.m.
Is engine speed 600 ± 20 r.p.m?
Increase engine speed to high idle. Record r.p.m.
Is engine speed 2600 ± 20 r.p.m.
YES: Check
complete.
NO: Do slow and
Fast idle
Adjustment. (See
“Slow And Fast
Idle Adjustment".
REVISION 0 43

44 REVISION 0

CHAPTER 2. ENGINE
SECTION 1. THEORY OF OPERATION
ENGINE
1. Final Fuel Filter.
2. Oil Filter.
3. Engine Exhaust Valve Rocker Arm.
4. Engine Intake Valve Rocker Arm.
5. Engine Exhaust Valve Brake.
6. Fuel Delivery Nozzle.
7. Electronic Unit Injector (EUI).
8. Intake Manifold.
9. Turbo Charger
10. Camshaft
11. Starter Motor.
12. Crankshaft.
13. Alternator.
14. Fuel Pump.
15. Flywheel.
16. Oil Pump.
The engine is a V - 8 cylinder lliquid cooled cast iron block and cast iron cylinderhead engine. It has
overhead valves, 3 per cylinder, two intake valves and one exhaust valve. Roller cam followers ride on
the camshaft which move the push rods that open and close the valves. The EUI’s (Electronic Unit
Injectors) also ride on the camshaft which send pressurized fuel through a fuel pipe to the fuel delivery
nozzles, which are located directly over the top of the piston. The EUI’s are electronically controlled by
the EUI controller, a crankshaft position sensor, camshaft position sensor and a solenoid.
REVISION 0 45

Electronic Unit Injector Fuel System
The EUI system is designed to precisely control:
• The start of injection.
• An accurate delivery of a calculated amount of
fuel.
• A sharp end of injection.
The fuel system consists of four sub-systems;
• Low Pressure Supply System,
• High Pressure System - Unit Injectors,
• Fuel Delivery Nozzles,
• Control System.
The electronic unit injector fuel system has these
notable features:
• Precision control of timing and fuel delivery,
• Field proven reliability,
• Electronic control of each cylinder,
• One unit injector per cylinder,
• High injection pressures,
• Low emissions,
• Compact design,
• Eliminates injection pump,
• No injection timing adjustment required.
Fuel Delivery
Suction Stage
2. Connector Pipe.
3. EUI (Electronic Unit Injector).
4. Valve.
5. Solenoid.
6. Supply Gallery in Crankcase.
7. High Pressure Chamber.
8. Pump Plunger.
9. Engine Camshaft.
10. Pressure Relief Chamber.
11. Return Flow Gallery in Crankcase.
12. Bleed-Off Chamber.
13. Return Fuel.
14. Low Pressure.
The EUI’s (3) ride on individual lobes on the
engine camshaft (9). There is one EUI per
cylinder. The EUI’s are mounted in the block of
the engine under the intake manifold.
46 REVISION 0
RETURN FUEL13
LOW PRESSURE14
40D3001CV
1
9
10
11
12
2 4 3
5
6
8
7

There are passages in the block that route fuel to
and from the EUI’s. The fuel delivery nozzles (1)
are located in the cylinder head and are
positioned directly above the pistons.
A connector pipe (2) is used to direct fuel from
the EUI’s to the nozzles. Internal passages in the
cylinder heads allow excess fuel from the nozzles
to be bled off.
A solenoid (5) controls the fuel metering valve
(4). For complete electrical theory of the MR/PLD
SEE “Engine Control Unit MR/PLD”.
During the suction stage, the pump plunger (8)
moves down. As a result of the constant fuel
excess pressure of approximately 600kPa (6 bar)
(87 psi) in the fuel low pressure circuit, the high
pressure chamber (7) of the unit pump is fitted
with fuel through the supply gallery (6).
Pre-Delivery Stage
2. Connector Pipe.
4. Valve.
5. Solenoid.
8. Pump Plunger.
9. Engine Camshaft.
13. Return Fuel.
14. Low Pressure.
During the pre-delivery stage, the pump plunger
(8) moves up. As the valve (4) is not yet closed,
the fuel is first forced into the pressure relief
chamber (10), then into the return gallery(11).
Delivery Stage
2. Connector Pipe.
4. Valve.
5. Solenoid.
8. Pump Plunger.
9. Engine Camshaft.
13. Return Fuel.
14. Low Pressure.
15. High Pressure.
REVISION 0 47
RETURN FUEL13
LOW PRESSURE14
HIGH PRESSURE15
40D3003CV
1 3
5
2 4
9
10
11 6
8 7
12

As soon as the valve (4) is closed while the pump
plunger (8) is moving towards its top dead centre,
the unit pump is in the delivery stroke. Fuel
injection into the combustion chamber takes
place in the delivery stage. During this stage the
fuel pressure in the high pressure chamber (7)
rises to a pressure approximately 160 000 kPa
(1600 bar) (23 206 psi).
Residual Stage
2. Connector Pipe.
4. Valve.
5. Solenoid.
8. Pump Plunger.
9. Engine Camshaft.
13. Return Fuel.
14. Low Pressure.
After the valve (4) has opened (end of delivery),
The fuel pressure in the high pressure chamber
(7) is collapsing.
The remaining fuel delivery by the pump plunger
(8) up to the apex of the camshaft (9), is again
forced into the pressure relief chamber (10) and
the return flow gallery (11).
The pressure relief chamber serves as an
expansion chamber for the pressure peaks of the
unit pump in the residual stage. This prevents the
pressure ratio of the adjacent unit pumps being
affected through the return flow gallery.
Cold Start Operation
1. Glow Plug.
2. Solenoid.
3. Cold Start Jet.
The cold start system operates only when the
engine coolant temperature is below 15° C (59°
F).
When the key switch is tuned to the “ON” the
position, the glow plug (1) begins to heat up and
the indicator light on the dash will light up. Light
will stay on and the glow plug will continue to
heat up for approximately twenty seconds.
When the key switch is turned to the START
position, the solenoid (2) is energized, allowing
fuel to flow to the cold start jet (3). The fuel from
the jet is sprayed on the glow plug causing the
fuel to atomize. The atomized air/fuel mixture is
directed to the cylinders by the incoming air
through the intake manifold. machine. Replace
the seat belt at least every three years,
regardless of the condition.
48 REVISION 0
RETURN FUEL13
LOW PRESSURE14
40D3004CV
1 3
5
2 4
9
10
11 6
8 7
12

CHAPTER 2. ENGINE
SECTION 2. DIAGNOSE ENGINE MALFUNCTIONS
Symptom Problem Solution
Starter motor turns engine too
slowly
Batteries under charged
Poor engine ground connection.
Loose or dirty battery terminals.
Worn starter motor.
Hydraulic Cut Off Solenoid
Valve.
Recharge or replace batteries.
Repair, clean or secure
connections.
Clean and tighten battery
terminals.
Perform starter load test.
Go to “Hydraulic System
Manifold Operation (Top
View)”.
Hard starting when cold Defective cold start aid.
Incorrect valve clearance.
Compression too low.
See “Cold Start Operation”
Adjust valve clearance (See
“Valve Clearance
Adjustment”)
Test compression (See
“Cylinder Compression Test”)
Engine turns but does not start Insufficient fuel in fuel tank.
Low fuel pump pressure.
Fill tank and bleed system.
Test fuel pump pressure (See
“Fuel Pump Pressure Test”)
Engine stops soon after starting Insufficient fuel in fuel tank.
Air in fuel system.
Blocked fuel filters.
Electronic Unit Injector.
Fill tank and bleed system.
Bleed system, check and repair
air entry.
Replace fuel filters.
Check fault codes.
Engine misfires Incorrect valve clearance.
Adjust valve clearance (See
“Valve Clearance
Adjustment”)
REVISION 0 49

Symptom Problem Solution
Low engine oil pressure Failed pressure gauge/sensor.
Incorrect grade of oil.
Low pump output.
Pressure relief valve stuck.
Engine bearings worn.
Test or replace.
Change oil.
Test oil pump pressure. Do Oil
Pump Pressure Test (See “Oil
Pump Pressure test”)
Install new pressure relief valve
(See Remove and Install Oil
Pressure relief valve in
CHAPTER 4, SECTION 5 of
Repair Manual.)
Remove, inspect and repair.
Abnormal oil consumption Crankcase breather or line
blocked.
Valve stem seals worn.
Valve guides worn.
Piston rings worn; cylinders
scored.
Inspect and repair.
Replace valve stem seals.
Replace valve guides.
Excessive vibration at any
speed.
Worn or broken engine
mountings.
Drive shaft out off balance.
Inspect, repair or replace.
Balance or replace.
Black smoke from exhaust. Inlet system restricted.
Incorrect grade of fuel.
Worn fuel delivery nozzles.
Service and repair inlet system.
Reset valve clearance.
Replace fuel delivery nozzles
(See Remove and Install Fuel
Delivery Nozzles in CHAPTER
4, SECTION 8 in repair
manual).
White smoke from exhaust. Engine running too cold.
Worn fuel delivery nozzles.
Pistons, rings or liners scored.
Coolant entering cylinder bores.
Cold start solenoid defective.
Check that thermostats are not
stuck open.
Replace fuel delivery nozzles
(See Remove and Install Fuel
Delivery Nozzles in CHAPTER
4, SECTION 8 in repair
manual).
Check cylinder head gasket.
Replace cylinder head gasket.
(See Cylinder Head in
CHAPTER 4, SECTION 6 in
repair manual).
Test solenoid. (See “Cold Start
Circuit”)
50 REVISION 0

CHAPTER 2. ENGINE
SECTION 3. ADJUSTMENTS
DISPLAY MENU TACHOMETER
The tachometer on the Menu Display Unit is
accurate enough for test work. (See Operators
Manual CHAPTER 2 for more information and
CHAPTER 8 for detail operating the Menu
Display Unit).
SLOW AND FAST IDLE
ADJUSTMENT
There is no slow or fast idle adjustment. If slow or
fast idle is not within specification, check for an
engine mechanical problem or an electrical
failure.
Slow Idle Speed RPM’s . . . . . . . . . 600 ± 20
Fast Idle Speed RPM’s . . . . . . . . 2240 ± 20
If no mechanical failure is found and the
controller is suspected, See Engine Control Unit
(ADM)” and “Engine Control Unit (MR/PLD)”
VALVE CLEARANCE
ADJUSTMENT
‹CAUTION
To prevent accidental starting of the engine
while performing valve adjustments, always
turn battery disconnect switch to “OFF”
NOTE: Check and adjust valve clearance only
when engine is COLD.
Remove rocker arm cover.
Install cranking device DC280088.
There are 37 slots (1) machined in the flywheel.
One slot has a dimple in it. This is the TDC timing
mark. Turn engine in the direction of rotation until
TDC timing mark (2) on flywheel lines up in
centre of the window in timing case.
NOTE: All valves can be adjusted in two
crankshaft positions.
Rocker arms and push rods for number one
cylinder should be loose. If not, rotate engine
360°. Engine must be at TDC on the
compression stroke for number one cylinder.
NOTE: When adjusting valve clearance, the
bolt on the valve bridge should on no account
be loosened.
REVISION 0 51

Measure the valve clearance between the rocker
arm and the valve bridge with a feeler gauge.
Check the valve clearance on cylinder two -
intake, cylinder three - exhaust, cylinder four -
exhaust, cylinder five - intake, cylinder six - intake
and exhaust, cylinder seven - intake and cylinder
eight - exhaust.
Crank engine until cylinder six is on TDC
(cylinder six valve overlap):
Check valve clearance on cylinder one - intake
and outlet, cylinder two - exhaust, cylinder three -
intake, cylinder four - intake, cylinder five -
exhaust, cylinder seven - exhaust and cylinder
eight - intake.
With number one cylinder on TDC (cylinder one
valve overlap):
Check the valve clearance on cylinder two -
intake, cylinder three - exhaust, cylinder four -
exhaust, cylinder five - intake, cylinder six - intake
and exhaust, cylinder seven - intake and cylinder
eight - exhaust.
Crank engine until cylinder six is on TDC
(cylinder six valve overlap):
Check valve clearance on cylinder one - intake
and outlet, cylinder two - exhaust, cylinder three -
intake, cylinder four - intake, cylinder five -
exhaust, cylinder seven - exhaust and cylinder
eight - intake.
Intake Valve Clearance . . . 0.40 mm (0.016in.)
Exhaust Valve Clearance . . 0.60 mm (0.024in.)
Locknut tightening torque . . . . 50Nm (37 lb-ft)
To adjust clearance: Loosen locknut (1) and turn
adjusting screw (2) in or out depending on gap to
big or small.
Tighten locknut to specification while holding
adjusting screw in position.
Adjust valves in same order used for checking.
Check clearance again after tightening locknut.
52 REVISION 0

EXHAUST BRAKE
ADJUSTMENT
With engine off, check the clearance between the
control arm (1) and the stop (2). In the brake
valve “OFF” position, the control arm should be
resting on the stop.
Disconnect the air line (3) from the cylinder.
Connect a regulated air supply line to the
cylinder. Regulate air pressure so pressure is
approximately 740 - 810 kPa (7.4 - 8.1 bar) (107 -
117 psi).
Check control arm (1) to stop (2) clearance. The
control arm must not rest on the stop. There must
be slight clearance between the control arm and
stop to ensure that exhaust brake is fully closed.
If adjustment is needed, loosen locknut (3),
remove clip (4) and disconnect cylinder from
control arm. Turn rod end (5) for adjustment.
REVISION 0 53

54 REVISION 0

CHAPTER 2. ENGINE
SECTION 4. TESTS
CYLINDER COMPRESSION
TEST
The test is normally performed with the
MiniDiag Special Tool.
NOTE: Compression pressures are affected
by the cranking speed of the engine. Before
beginning the test, ensure that the batteries
are fully charged and the starter motor is in a
good working condition.
Remove fuel delivery nozzle from cylinder being
tested. See CHAPTER 4, SECTION 8 of repair
Manual Remove and Install Fuel Delivery
Nozzle.
Install JDG1599 compression tester adapter (1)
into cylinder head.
Install holddown clamp (2) using an M10 x 1.5 x
70 mm long cap screw (3).
Install compression tester to adapter.
‹CAUTION
Engine must not be started with fuel line from
EUI disconnected.
Remove Fuse 17 (ECU/EUI Power Fuse).
Crank engine approximately ten seconds. Record
readings and compare to specification.
Engine Compression Pressure
. . . . . . . . . . . 2800 kPa (28 bar) (406 psi).
Permissible Difference Between Cylinders
. . . . . . . . . . . . . 400 kPa (4 bar) (58psi).
FUEL PUMP PRESSURE TEST
Specification
Pressure At Slow Idle . . . . . . . 210 -300 kPa
. . . . . . . . . . . . . (2.1 - 3 bar) (30 - 44psi).
Pressure At Fast Idle. . . . . . . . 500 - 600kPa
. . . . . . . . . . . . . . (5 - 6 bar) (73 - 87psi).
Essential Tools
Parker No. 34982-16-6: Banjo Union.
Parker No. 0502-12-12: 1 1/16 - 12M x 3/4 -
14NPT F Adapter.
Parker No. 3/4 x 1/2 PTR: 3/4 - 14
PT M x 1/2 - 14 NPT F Pipe Thread Reducer.
Parker No. 1/2 x 3/8 PTR: 1/2 - 14 NPT M x 3/8 - 18
NPT F Pipe Thread Reducer.
Parker No. 30182-6-6: 3/8 - 18 NPT M x 3/8 Barb
Fitting.
Service Equipment And Tools
JT07148 Digital Hydraulic Tester.
JT07156 0.5 to 15 GPM Lt. Flow Meter.
REVISION 0 55

NOTE: Above illustration is of a LA 501 engine with photos of the LA 502 engine inserted.
Connect banjo union fittings (1) to fuel pump outlet port and fuel filter inlet.
Connect fittings (2 - 5) to flow meter and flow meter to hydraulic tester.
Run engine at slow idle and measure fuel pump pressure. Compare to specification.
Run engine at fast idle and compare to specification.
56 REVISION 0
50D3001CV
1
1
1
1
2
3
5
4

OIL PUMP PRESSURE TEST
Specification
Engine Oil Pressure at Slow Idle
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 50kPa (0.5 bar) (7.3psi).
Engine Oil Pressure at Fast Idle
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 250 kPa (2.5 bar) (36.3psi).
Essential Tools
Parker No. 8M16F80MX: M 16 x 1.5 M x 3/4 - 16 M 37° Adapter.
JT03132: 3/4 - 16 M 37° x 3/4 - 16 F 37° Sw 90° Elbow.
JT03003: 7/16 - 20 M 37° x 3/4 - 16 F 37° Reducer.
Service Equipment And Tools
• 413 kPa (4.1 bar) (60psi) Gauge.
Remove engine oil pressure sensor. (See “Engine Main Harness” ).
REVISION 0 57
2000
1500
1000
0
500
40D3006CV
1
2
3

Install adapter (1), elbow (2) and reducer (3) to
engine and connect gauges to fittings.
NOTE: To achieve an accurate oil pressure
reading, warm engine to 105° C (220° F).
Run engine at slow idle. Compare reading to
specification.
Run engine at fast idle. Compare reading to
specification.
58 REVISION 0

Engine Schematic
REVISION 0 59
87
908988
296Ay
8
888
181
DIAG-G
START-K150
R7-87
MCB1-2
15
86
95
91
14
2
8
8
8
2
FUSE8-1
R5-86
R7-86
DIAG-F
FUSE6-1
GN1.5
RD/YL1.5
BK/WH1.5
OR1.5
BK1.5
BK1.5
30
87a
8586
87
RELAY12
ADM/MR
SUPPLY
BK1.5
RD1.5
X106
X7
X9
X8
X10
YL1.0
PL0.35
BK/YL0.5
GN0.5
BR/YL0.5
BL0.5
VL0.5
BR/BK0.5
GN/BL0.5
GR/YL0.5
BL/WH0.5
YL0.5
BR/GY0.5
RD/BK0.5
WH0.5
RD/WH0.5
BR/VL0.5
WH/YL0.5
BR/WH0.5
RD/YL0.5
GY/BR0.5
GN0.35
WH0.35
RD0.35
BN0.35
GN1.0
SHIELD
X19-B
X19-C
X19-A
BL/GN1.5
BK/YL1.5
BL/RD1.5
X3-14
X25-6
X25-4
X25-3
X25-5
X25-1
X3-5
X3-6
X3-28
X3-25
BK2.5
RD1.5
PL1.5
YL/GN1.0
X3-24BL1.0
BN1.0
RD1.5
RD1.5
RD1.5
BK/WH1.5
BK/WH1.5
GN2.5
GN2.5
BK1.5
RD1.5
PWM-
ACCELERATOR
PEDAL
6
4
3
5
2
1
PWMPWM
(4) (2)
(3) (1)(6) (5)
+
+
_ _
BL/YL1.5
X3-13BK1.0
X25-2
MR-1
N3-2
N3-1
N3-44
N3-32
MR-3
N3-19
N3-20
N3-46
N3-10
N3-24
MR-4
N3-3
N3-38
N3-6
N3-26
MR-2
N3-34
N3-37
N3-8
N3-27
MR-9
N3-15
N3-9
N3-49
N3-28
MR-11
N3-39
N3-53
N3-33
N3-4
MR-15
N3-45
N3-30
N3-36
MR-5
N3-47
N3-25
N3-13
MR-6
N3-7
N3-16
N3-35
N3-40
N3-14
MR-8
N3-22
N3-17
N3-11
N3-41
N3-50
MR-12
N3-29
N3-18
N3-12
N3-42
N3-51
MR-13
N3-48
N3-54
N3-43
N3-52
N3-55
N3-21
N3-31
PLD
ENGINE
CONTROL
UNIT
12-1
18-2
21-3
21-20
21-21
21-19
21-12
21-13
21-14
21-1
15-15
15-14
15-13
15-5
12-2
18-9
21-2
15-6
ADM-
MERCEDES
ENGINE
CONTROL
UNITYL0.35
E1
E1
E1
E1
E2
B15
B16
B65
B14
Y6
Y8
Y10
Y11
1
4
2
5
3
6
7
8
2
2
1
2
2
1
2
2
4
3
1
1
2
1
1
2
1
1
B11
B90
START
S10
V8
STOP
S11
3
1
2
B12
2
1B10
TEMP
Y7
Y9
Y12
Y13
N3-5
N3-23
BK/VL0.5
MERCDESBENZAND
SCHEMATICFOROM502LA
B50DADT
ADMPLD
GY/BK1.5
GY/BL1.5
WH/RD1.5
OR/GN1.5
GY/PL1.5
OR/BL1.5
GY/WH1.5
WH/BL1.5
GY/YL1.5
GY/GN1.5
CHARGEAIRPRESSURESENSOR(COMBINATION)
CHARGEAIRTEMPERATURESENSOR
STARTBUTTON
UNITPUMPSOLENOIDCYLINDER1
CAMSHAFTSENSOR
CRANKSHAFTSENSOR
OILTEMPERATURESENSOR(COMBINATIONSENSOR)2260........2701Ohm
2205........2653Ohm
NORMALLYOPEN
NORMALLYOPEN
2260........2701Ohm
15........22Ohm
1000........1385Ohm
1000........1385Ohm
0,07........0.37Ohm
0,07........0.37Ohm
0,07........0.37Ohm
0,07........0.37Ohm
0,07........0.37Ohm
0,07........0.37Ohm
0,07........0.37Ohm
0,07........0.37Ohm
0,6...1,1Volt
1,0...1,4Volt
OILPRESSURESENSOR(COMBINATIONSENSOR)
FUELPRESSURESENSOR
STOPBUTTON
COOLANTTEMPERATURESENSOR
OILLEVELSENSOR
B11
B10
B12
UNITDESCRIPTIONVALUE@20C
B14
B15
B16
B65
B90
S10
S11
Y6
Y7
Y8
Y9
Y10
Y11
Y12
Y13
LEGEND
BELLTRAININGCENTER
TR001233
B50DREVISION0.1

CAN BUS J1939
WHAT EXACTLY IS A “CAN
BUS”
The Controller Area Network (CAN) is a serial
communications protocol that efficiently
distributes real time control (Data) with great
Data integrity. In other words it is a system that
sends data (In a binary code or math between
electronic control units.)
The “CAN” is a means of transferring data
between components and in the case of the "D"
Series ADT’s there is a “CAN” between
numerous components, namely:
SSM · Sealed Switch Module
MDU · Monitor Display Unit
TCU · Transmission Control Unit
CCU · Chassis Control Unit
ECU · Commonly known as the ADM is the
· · · · Engine control unit (Cab Mounted).
MR · · Engine mounted control unit (PLD).
OBW · On Board Weighing
FDC · Fan Drive Controller
SCU · Suspension control unit
MM· · Memory module
OEU · Output Expansion Unit.
There are numerous advantages of using a
“CAN” system:
Reliable.
Fast.
Cost effective.
High flexibility.
The following illustrations describe the Bell
“CAN” and the tests that can be carried out to
test the wiring.
60 REVISION 0

CANBUS
REVISION 0 61
BELLTRAININGCENTER
TR001634
B50DREVISION01
SAEJ1939CANBUS
X94-A
X94-C
X94-B
120OHM3WAY
DEUTSCHCAN
TERMINATOR
X93-A
X93-C
X93-B
120OHM3WAY
DEUTSCHCAN
TERMINATOR
DiagCTITCUMDUCCUOBW
FDCADMMRSCUMM&
GPS
SAT.
Modem
Wakeup
Module
7.2V
GN 1.0
YL 1.0
SHIELD
GN 1.0
YL 1.0
SHIELD
GN 1.0
YL 1.0
SHIELD
GN 1.0
YL 1.0
SHIELD
GN 1.0
YL 1.0
SHIELD
GN 1.0
YL 1.0
SHIELD
GN 1.0
YL 1.0
SHIELD
GN 1.0
YL 1.0
SHIELD
GN 1.0
YL 1.0
SHIELD
GN 1.0
YL 1.0
SHIELD

HITACHI B50D MK Ⅲ 6×6 ARTICULATED DUMP TRUCK Service Repair Manual

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