2. CONTENTS
01 GENERAL ............................................................................................................ 01-1
10 STRUCTURE AND FUNCTION ........................................................... 10-1
20 TESTING AND ADJUSTING ................................................................ 20-1
30 DISASSEMBLY AND ASSEMBLY ..................................................... 30-1
40 MAINTENANCE STANDARD ............................................................... 40-1
90 OTHERS ............................................................................................................... 90-1
00-2 WD600-3
(2)
3. SAFETY SAFETY NOTICE
00-3
SAFETY
SAFETY NOTICE
IMPORTANT SAFETY NOTICE
Proper service and repair is extremely important for safe machine operation. The service and
repair techniques recommended by Komatsu and described in this manual are both effective
and safe. Some of these techniques require the use of tools specially designed by Komatsu for
the specific purpose.
To prevent injury to workers, the symbol k is used to mark safety precautions in this manual.
The cautions accompanying these symbols should always be followed carefully. If any danger-
ous situation arises or may possibly arise, first consider safety, and take the necessary actions
to deal with the situation.
GENERAL PRECAUTIONS
Mistakes in operation are extremely dangerous.
Read the Operation and Maintenance Manual care-
fully BEFORE operating the machine.
1. Before carrying out any greasing or repairs, read
all the precautions given on the decals which are
fixed to the machine.
2. When carrying out any operation, always
wear safety shoes and helmet. Do not wear
loose work clothes, or clothes with buttons
missing.
• Always wear safety glasses when hitting
parts with a hammer.
• Always wear safety glasses when grinding
parts with a grinder, etc.
3. If welding repairs are needed, always have a
trained, experienced welder carry out the work.
When carrying out welding work, always wear
welding gloves, apron, hand shield, cap and
other clothes suited for welding work.
4. When carrying out any operation with two or
more workers, always agree on the operating
procedure before starting. Always inform your
fellow workers before starting any step of the
operation. Before starting work, hang UNDER
REPAIR signs on the controls in the operator's
compartment.
5. Keep all tools in good condition and learn the
correct way to use them.
6. Decide a place in the repair workshop to keep
tools and removed parts. Always keep the tools
and parts in their correct places. Always keep
the work area clean and make sure that there is
no dirt or oil on the floor. Smoke only in the areas
provided for smoking. Never smoke while work-
ing.
PREPARATIONS FOR WORK
7. Before adding oil or making any repairs, park the
machine on hard, level ground, and block the
wheels or tracks to prevent the machine from
moving.
8. Before starting work, lower blade, ripper, bucket
or any other work equipment to the ground. If
this is not possible, insert the safety pin or use
blocks to prevent the work equipment from fall-
ing. In addition, be sure to lock all the control
levers and hang warning signs on them.
9. When disassembling or assembling, support the
machine with blocks, jacks or stands before
starting work.
10.Remove all mud and oil from the steps or other
places used to get on and off the machine.
Always use the handrails, ladders or steps when
getting on or off the machine. Never jump on or
off the machine. If it is impossible to use the
handrails, ladders or steps, use a stand to pro-
vide safe footing.
4. SAFETY SAFETY NOTICE
00-4
PRECAUTIONS DURING WORK
11.When removing the oil filler cap, drain plug or
hydraulic pressure measuring plugs, loosen
them slowly to prevent the oil from spurting out.
Before disconnecting or removing components
of the oil, water or air circuits, first remove the
pressure completely from the circuit.
12.The water and oil in the circuits are hot when the
engine is stopped, so be careful not to get
burned.
Wait for the oil and water to cool before carry-
ing out any work on the oil or water circuits.
13.Before starting work, remove the leads from the
battery. Always remove the lead from the nega-
tive (–) terminal first.
14.When raising heavy components, use a hoist or
crane.
Check that the wire rope, chains and hooks are
free from damage.
Always use lifting equipment which has ample
capacity.
Install the lifting equipment at the correct places.
Use a hoist or crane and operate slowly to pre-
vent the component from hitting any other part.
Do not work with any part still raised by the hoist
or crane.
15.When removing covers which are under internal
pressure or under pressure from a spring,
always leave two bolts in position on opposite
sides. Slowly release the pressure, then slowly
loosen the bolts to remove.
16.When removing components, be careful not to
break or damage the wiring. Damaged wiring
may cause electrical fires.
17.When removing piping, stop the fuel or oil from
spilling out. If any fuel or oil drips onto the floor,
wipe it up immediately. Fuel or oil on the floor
can cause you to slip, or can even start fires.
18.As a general rule, do not use gasoline to wash
parts. In particular, use only the minimum of
gasoline when washing electrical parts.
19.Be sure to assemble all parts again in their origi-
nal places.
Replace any damaged parts with new parts.
• When installing hoses and wires, be sure
that they will not be damaged by contact
with other parts when the machine is being
operated.
20.When installing high pressure hoses, make sure
that they are not twisted. Damaged tubes are
dangerous, so be extremely careful when install-
ing tubes for high pressure circuits. Also, check
that connecting parts are correctly installed.
21.When assembling or installing parts, always use
the specified tightening torques. When installing
protective parts such as guards, or parts which
vibrate violently or rotate at high speed, be par-
ticularly careful to check that they are installed
correctly.
22.When aligning two holes, never insert your fin-
gers or hand. Be careful not to get your fingers
caught in a hole.
23.When measuring hydraulic pressure, check that
the measuring tool is correctly assembled before
taking any measurements.
24.Take care when removing or installing the tracks
of track-type machines.
When removing the track, the track separates
suddenly, so never let anyone stand at either
end of the track.
5. FOREWORD GENERAL
00-5
FOREWORD
GENERAL
This shop manual has been prepared as an aid to improve the quality of repairs by giving the serviceman an
accurate understanding of the product and by showing him the correct way to perform repairs and make judge-
ments. Make sure you understand the contents of this manual and use it to full effect at every opportunity.
This shop manual mainly contains the necessary technical information for operations performed in a service
workshop. For ease of understanding, the manual is divided into the following chapters; these chapters are fur-
ther divided into the each main group of components.
STRUCTURE AND FUNCTION
This section explains the structure and function of each component. It serves not only to give an under-
standing of the structure, but also serves as reference material for troubleshooting.
In addition, this section may contain hydraulic circuit diagrams, electric circuit diagrams, and mainte-
nance standards.
TESTING AND ADJUSTING
This section explains checks to be made before and after performing repairs, as well as adjustments to
be made at completion of the checks and repairs.
Troubleshooting charts correlating "Problems" with "Causes" are also included in this section.
DISASSEMBLY AND ASSEMBLY
This section explains the procedures for removing, installing, disassembling and assembling each com-
ponent, as well as precautions for them.
MAINTENANCE STANDARD
This section gives the judgment standards for inspection of disassembled parts.
The contents of this section may be described in STRUCTURE AND FUNCTION.
OTHERS
This section mainly gives hydraulic circuit diagrams and electric circuit diagrams.
In addition, this section may give the specifications of attachments and options together.
NOTICE
The specifications contained in this shop manual are subject to change at any time and without any
advance notice. Use the specifications given in the book with the latest date.
6. FOREWORD HOW TO READ THE SHOP MANUAL
00-6
HOW TO READ THE SHOP MANUAL
VOLUMES
Shop manuals are issued as a guide to carrying out
repairs. They are divided as follows:
Chassis volume: Issued for every machine model
Engine volume: Issued for each engine series
Electrical volume:
Attachments volume:
These various volumes are designed to avoid dupli-
cating the same information. Therefore, to deal with
all repairs for any model , it is necessary that chas-
sis, engine, electrical and attachment volumes be
available.
DISTRIBUTION AND UPDATING
Any additions, amendments or other changes will be
sent to KOMATSU distributors. Get the most up-to-
date information before you start any work.
FILING METHOD
1. See the page number on the bottom of the page.
File the pages in correct order.
2. Following examples show how to read the page
number.
Example 1 (Chassis volume):
10 - 3
Item number (10. Structure and
Function)
Consecutive page number for each
item.
Example 2 (Engine volume):
12 - 5
Unit number (1. Engine)
Item number (2. Testing and Adjust-
ing)
Consecutive page number for each
item.
3. Additional pages: Additional pages are indicated
by a hyphen (-) and number after the page
number. File as in the example.
Example:
10-4
10-4-1
10-4-2
10-5
REVISED EDITION MARK
When a manual is revised, an edition mark
((1)(2)(3)....) is recorded on the bottom of the pages.
REVISIONS
Revised pages are shown in the LIST OF REVISED
PAGES next to the CONTENTS page.
SYMBOLS
So that the shop manual can be of ample practical
use, important safety and quality portions are
marked with the following symbols.
Symbol Item Remarks
k Safety
Special safety precautions
are necessary when per-
forming the work.
a Caution
Special technical precau-
tions or other precautions
for preserving standards
are necessary when per-
forming the work.
4 Weight
Weight of parts of sys-
tems. Caution necessary
when selecting hoisting
wire, or when working pos-
ture is important, etc.
3
Tightening
torque
Places that require special
attention for the tightening
torque during assembly.
2 Coat
Places to be coated with
adhesives and lubricants,
etc.
5 Oil, water
Places where oil, water or
fuel must be added, and
the capacity.
6 Drain
Places where oil or water
must be drained, and
quantity to be drained.
}·
Each issued as one
volume to cover all
models
12-203
12-203-1
12-203-2
12-204
Added pages
7. WD600-3 01-1
01 GENERAL
General assembly drawing............................ 01-2
Specifications ................................................. 01-3
Weight table.................................................... 01-6
List of lubricant and water ............................. 01-7
8. WD600-3
GENERAL
01-2
GENERAL ASSEMBLY DRAWING
Item Unit WD600-3
A Overall length mm 9,285
B Overall height mm 4,250
C Blade clearance mm 1,500
D Max. drop below ground mm 450
E Max. tilt adjustment mm 1,430
F Blade width mm 5,100
G Overall width mm 3,570
H Front overhung mm 2,210
I Wheel base mm 4,100
– Blade size (width x height) mm 5,100 x 1,470
GENERAL ASSEMBLY DRAWING
9. GENERAL
WD600-3 01-3
SPECIFICATIONS
Machine model WD600-3
Serial Number 50001 and up
Operating weight kg 42,900
Front wheel load kg 20,400
Rear wheel load kg 22,500
Travel speed FORWARD 1st speed km/h 6.5
FORWARD 2nd speed km/h 11.4
FORWARD 3rd speed km/h 20.0
FORWARD 4th speed km/h 34.3
REVERSE 1st speed km/h 7.2
REVERSE 2nd speed km/h 12.6
REVERSE 3rd speed km/h 22.1
REVERSE 4th speed km/h 37.7
Max. rimpull kN {kg} 419.7{42,800}
Gradeability deg 25
Center of outside wheel 6,980
Outer end of blade
mm
8,500
Overall length mm 9,285
Overall width (Outside of wheel) mm 3,570
(Blade) mm 5,100
Overall height (Upper end of ROPS) mm 4,250
(Top of exhaust pipe) mm 4,125
Wheelbase mm 4,100
Tread mm 2,650
Min. ground clearance mm 495
SPECIFICATIONS
WeightPerformance
Min.
turning
radius
Dimension
10. WD600-3
GENERAL
01-4
SPECIFICATIONS
Axle,wheelBrakesPowertrainEngine
Performance
Model SAA6D170E-3
Type
No. of cylinders - bore x stroke mm 6 – 170 x 170
Piston displacement ¬ {cc} 23.15 {23,150}
Flywheel horsepower kW/rpm {HP/rpm} 362/2,000 {485/2,000}
Maximum torque Nm/rpm {kgm/rpm} 2,390/1,400 {244/1,400}
Fuel consumption ratio g/kW•h {g/HP•h} 231 {172}
High idling speed rpm 2,175
Low idling speed rpm 700
Starting motor
Alternator
Battery
Torque converter
Transmission
Reduction gear
Differential Straight bevel gear
Final drive
Drive type Front/rear-wheel drive
Front axle Fixed-frame, full-floating
Rear axle Center pin support type, full-floating
Tire 35/65 x 33 – 24 PR (L4)
Wheel rim 28.00 x 33 WTB
Inflation pressure Front tire kPa {kg/cm2
} 343 {3.5}
Rear tire kPa {kg/cm2
} 392 {4.0}
Main brake
Parking brake
Machine model WD600-3
Serial No. 50001 and up
Front/rear wheel braking, separate front/rear wheel,
wet disc, hydraulically actuated
Drive shaft, dry caliper type disc brake,
Hydraulically released spring type
4-cycle, water-cooled, in-line,
6-cylinder, direct injection, with turbocharger,
and after-cooler
3-element, 1-stage,
single-phase
Planetary gear, constant-mesh
multiple-disc, hydraulically actuated,
pressure rised lubrication, modulation type
Spiral bevel gear, splash lubrication
Planetary gear single stage,
splash lubrication
24V, 7.5kW x 2
24V, 50A
(12V, 200Ah) x 2
11. GENERAL
WD600-3 01-5
SPECIFICATIONS
Machine model WD600-3
Serial Number 50001 and up
Type Articulated steering
Structure Hydraulic power steering
Work equipment pump 152 (Gear pump: SAL (3)-80)
Switch pump 204 (Gear pump: SAL (4)-100)
Steering pump 246 (Gear pump: SAL (4)-125)
PPC pump 63 (Gear pump: SAL (1)- 32)
247 (Gear pump: SAL (3)-125)
2-spool type 20.6 {210}
Orbit roll + spool valve type 20.6 {210}
Double acting piston type 1 – 160 x 1,080
Double acting piston type 2 – 180 x 236.5
Double acting piston type 2 – 140 x 495
Blade width mm 5,100
Blade height mm 1,470
Max. lifting height mm 1,500
Max. tilting distance mm 1,430
Pitch angle deg 23
Max. digging depth mm 450
Transmission and PTO
lubrication pump
Steering
system
Dozersystem
Delivery of
hydraulic
pump
Control
valve
Cylinder
For work equipment,
set pressure
For steering system,
set pressure
Lift cylinder
No. - bore x stroke
Pitch and tilt cylinder
No. - bore x stroke
Steering cylinder
No. - bore x stroke
Hydraulicsystem
¬ /min
MPa {kg/cm2
}
mm
12. WD600-3
GENERAL
01-6
WEIGHT TABLE
WEIGHT TABLE
Unit: kg
Machine model WD600-3
Serial Number 50001 and up
Engine assembly 2,900
Radiator assembly 630
Torque converter assembly 340
Transmission assembly 1,465
Upper drive shaft 27
Center drive shaft 57
Front drive shaft 57
Rear drive shaft 49
Center support 46
Front axle assembly 3,065
Rear axle assembly 2,965
Front differential assembly 499
Rear differential assembly 508
Planetary carrier assembly (1 piece) 115
Wheel (1 piece) 453
Front axle support 126
Rear axle support 153
Tire (1 piece) 1,027
Steering valve 48
Steering cylinder (1 piece) 84
Hydraulic tank assembly 362
Steering + switch pumps 39
Transmission + PPC pumps 24
Work equipment pump 12.2
Work equipment valve 71
Machine model WD600-3
Serial Number 50001 and up
Lift cylinder 205
Pitch and tilt cylinder 184
Front frame 3,905
Rear frame 3,645
Blade assembly 2,776
End bit (1 piece) 35
Edge (1 piece) 67
H linkage 486
Y linkage 549
Rear bumper 410
Fuel tank 405
Battery (1 piece) 59
Cab 456
ROPS 822
Operator seat 35
Floor frame 184
Counterweight (1 piece) 600
Bulk head 182
Engine hood 80
Side hood (1 piece) 38
Radiator guard 270
Side floor (beside cab) (1 piece) 71
Side floor (beside hood) (1 piece) 11
Step (beside hood) (1 piece) 38
Unit: kg
5 This table describes mass of assemblies requiring teamwork or lifting tool for hauling.
13. GENERAL
WD600-3 01-7
LIST OF LUBRICANT AND WATER
LIST OF LUBRICANT AND WATER
RESER-
VOIR
KIND OF
FLUID
Engine oil
pan
Transmis-
sion case
Hydraulic
system
Axle
(Front and
rear)
(each)
Pins
Fuel tank
Cooling
system
–22 –4 14 32 50 68 86 104 122°F
–30 –20 –10 0 10 20 30 40 50°C
CAPACITY
Specified Refill
SAE 30
SAE 10W
SAE 10W-30
SAE 15W-40
SAE 30
SAE 10W
120 ¶ 110 ¶
330 ¶ 215 ¶
124 ¶ 124 ¶
– –
670 ¶ –
SAE 10W
Engine
oil
Grease
Diesel
fuel
Water
NLGI No. 2
ASTM D975 No. 2
ª
See Note 1
Add antifreeze
AMBIENT TEMPERATURE
Note 1:
For axle oil, use only recommended oil as follows.
ª ASTM D975 No. 1
–
62 ¶
160 ¶
47 ¶
Meker Description
SHELL DONAX TD 5W-30
MOBIL MOBILFLUID 424
14. WD600-3
GENERAL
01-8
LIST OF LUBRICANT AND WATER
REMARK:
• When fuel sulphur content is less than 0.5 %,
change oil in the oil pan every periodic main-
tenance hours described in this manual.
Change oil according to the following table if
fuel sulphur content is above 0.5 %.
Fuel sulphur content
0.5 to 1.0 % 1/2 of regular interval
Above 1.0 % 1/4 of regular interval
• When starting the engine in an atmospheric
temperature of lower than 0°C, be sure to use
engine oil of SAE10W, SAE10W-30 and
SAE15W-40 even though an atmospheric tem-
perature goes up to 10°C more or less in the
day time.
• Use API classification CD as engine oil and if
API classification CC, reduce the engine oil
change interval to half.
• There is no problem if single grade oil is mixed
with multigrade oil (SAE10W-30, 15W-40), but
be sure to add single grade oil that matches
the temperature in the table.
• We recommend Komatsu genuine oil which
has been specifically formulated and ap-
proved for use in engine and hydraulic work
equipment applications.
Specified capacity: Total amount of oil including
oil for components and oil in piping.
Refill capacity: Amount of oil needed to refill sys-
tem during normal inspection and maintenance.
ASTM: American Society of Testing and Material
SAE: Society of Automotive Engineers
API: American Petroleum Institute
Change interval of
oil in engine oil pan
15. 10-1WD600-3
10 STRUCTURE AND FUNCTION
Cooling system ............................................. 10- 2
General .......................................................... 10- 4
Power train system ...................................... 10- 6
Torque converter and transmission piping .. 10- 8
Torque converter .......................................... 10-10
Torque converter regulator valve................ 10-14
Lock-up valve ................................................ 10-16
Lock-up solenoid valve ................................ 10-20
Torque converter relief valve....................... 10-21
Transmission ................................................ 10-23
Transmission control valve ......................... 10-28
Lubrication bypass valve ............................. 10-38
Transmission solenoid valve ....................... 10-39
Emergency manual spool ............................ 10-41
Transfer ......................................................... 10-42
Drive shaft ..................................................... 10-43
Center support .............................................. 10-44
Axle................................................................ 10-45
Differential .................................................... 10-47
Final drive ..................................................... 10-55
Axle and center hinge pin............................ 10-56
Steering piping .......................................... 10-57-1
Steering column ........................................... 10-58
Steering unit (orbit-roll valve) ..................... 10-59
Steering valve ............................................... 10-62
Two-way restriction valve ............................ 10-73
Stop valve ..................................................... 10-74
Emergency steering piping ......................... 10-75
Diverter valve (for emergency steering)..... 10-76
Brake piping .................................................. 10-79
Brake valve.................................................... 10-80
Charge valve ................................................. 10-85
Accumulator (for brake) ............................... 10-89
Slack adjuster ............................................... 10-90
Brake.............................................................. 10-93
Parking brake ................................................ 10-95
Spring cylinder ............................................. 10-97
Parking brake solenoid valve ...................... 10-98
Hydraulic piping ........................................... 10-99
Work equipment lever linkage .................. 10-100
Hydraulic tank ............................................. 10-101
Accumulator (for PPC valve) ..................... 10-104
PPC valve .................................................... 10-105
PPC relief valve ........................................... 10-110
Work equipment valve ............................... 10-112
DECO valve ................................................. 10-123
Air conditioner ............................................ 10-134
Machine monitor system ........................... 10-137
Main monitor .............................................. 10-138
Maintenance monitor................................. 10-142
Engine starting circuit ................................ 10-144
Engine stop circuit...................................... 10-145
Pre-heating circuit ...................................... 10-146
Electric transmission control ..................... 10-147
Kick-down, hold switch .............................. 10-150
Transmission and joystick steering system ... 10-151
Throttle control system.............................. 10-170
(3)
16. STRUCTURE AND FUNCTION
10-2 WD600-3
COOLING SYSTEM
1. After cooler
2. Water level sensor
3. Upper tank
4. Radiator core
5. Fuel cooler
6. Sub tank
7. Lower tank (hydraulic oil cooler 7A, 7B)
A: After cooler outlet port
B: After cooler inlet port
C: Cooling water inlet port
D: Hydraulic oil cooler inlet port
E: Hydraulic oil cooler outlet port
F: Cooling water outlet port
SPECIFICATIONS
Radiator
• Core model: PF2-7
• Total heat dissipating area: 166.80 m2
• Cross-sectional area of water flow:
233.43 cm2
Hydraulic oil cooler
Oil cooler 7A Oil cooler 7B
Core type PTO-OL PTO-OL
Heat dissipating area 1.829 m2 1.829 m2
After cooler
• Core type: CF40-1
• Total heat dissipating area: 6.45 m2
COOLING SYSTEM
18. STRUCTURE AND FUNCTION
10-4 WD600-3
GENERAL
GENERAL
• LOCATION OF COMPONENTS
OUTLINE
• The motive force from engine (1) is transmit-
ted from the flywheel through the ring gear
to torque converter (2).The torque converter
uses oil as a medium to convert the transmit-
ted torque to match the variation in the load.
It transmits this motive force to the input shaft
of transmission (4).
• In addition, the motive power of the engine
passes through the pump drive gear and is
sent to the two double pumps, and drives each
of the pumps.
• In transmission (4), solenoid valves are used
to operate the direction spool and speed spool
of the transmission valve. In this way, the six
hydraulically operated clutches are actuated
to select FORWARD and REVERSE speeds.
The speed selection is carried out manually.
• The output shaft of transmission (4) transmits
the motive force through the gear of transfer
(5) to the output shaft of the transfer.
At the front, the motive force is transmitted
through center drive shaft (6), center support
(7), and front drive shaft (8) to front differen-
tial (9).
At the rear, the motive force is transmitted
from rear drive shaft (10) to rear differential
(11).
• The motive force transmitted to front differ-
ential (9) and rear differential (11) is transmit-
ted to the sun gear shaft (axle shaft) of final
drives.
• The motive force of the sun gear is reduced
by a planetary mechanism, and passes
through the planetary hub to front wheel and
rear wheel.
20. 10-7
STRUCTURE AND FUNCTION
WD600-3
POWER TRAIN SYSTEM
OUTLINE
• The motive force from engine (1) is transmit-
ted from the flywheel through the ring gear
to torque converter (2). The torque converter
uses oil as a medium to convert the transmit-
ted torque to match the variation in the load.
It transmits this motive force to the input shaft
of transmission (8).
• In addition, the motive power of the engine
passes through the pump drive gear and is
sent to the pumps (4), (5) and (6), and drives
each of the pumps.
• In transmission (8), solenoid valves are used
to operate the direction spools and speed
spools of the transmission valve. In this way,
the six hydraulically operated clutches are
actuated to select FORWARD and REVERSE
speeds. The speed selection is carried out
manually.
• The output shaft of transmission (8) transmits
the motive force through the gear of transfer
(9) to the output shaft of the transfer.
At the front, the motive force is transmitted
through center drive shaft (11), center support
(12), and front drive shaft (13) to front differ-
ential (15).
At the rear, the motive force is transmitted
from rear drive shaft (20) to rear differential
(21).
• The motive force transmitted to front differ-
ential (15) and rear differential (21) is trans-
mitted to the sun gear shaft (axle shaft) of fi-
nal drives (18) and (24).
• The motive force of the sun gear is reduced
by a planetary mechanism, and passes
through the planetary hub to front wheel (19)
and rear wheel (25).
1. Engine
2. Torque converter
3. P T O
4. Steering + Switch pump
(SAL(4)125 + (4)100)
5. Torque converter charging + PPC pump
(SAL(3)125 + (1)32)
6. Work equipment pump
(SAL(3)80)
7. Upper drive shaft
8. Transmission
9. Transfer
10. Emergency steering pump (If equipped)
11. Center drive shaft
12. Center support
13. Front drive shaft
14. Parking brake
15. Front differential
16. Front axle
17. Front brake
18. Front final drive
19. Front wheel
20. Rear drive shaft
21. Rear differential
22. Rear axle
23. Rear brake
24. Rear final drive
25. Rear wheel
21. STRUCTURE AND FUNCTION
10-8 WD600-3
TORQUE CONVERTER AND TRANSMISSION PIPING
TORQUE CONVERTER AND TRANSMISSION PIPING
1. Transmission
2. Transmission control valve
3. Torque converter
4. Oil cooler
5. Oil filter
6. Torque converter charging
and PPC pump
A. Oil inlet
B. Oil outlet
22. Thank you very much for
your reading. Please Click
Here. Then Get COMPLETE
MANUAL. NO WAITING
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click on the link above,
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24. 10-11
STRUCTURE AND FUNCTION
WD600-3
TORQUE CONVERTER
1. Regulator valve
2. Coupling
3. Housing
4. Torque converter inlet pressure
pick-up (PT 1/8)
5. Torque converter outlet oil temperature
pick-up
6. Torque converter outlet pressure
pick-up (PT 1/8)
7. Stator
8. Turbine
9. Drive case
10. Pump
11. Shaft
12. Lock-up valve
13. Lock-up clutch
14. One-way clutch
15. Mounting part of torque converter charge
pump and PPC pump
16. Mounting part of work equipment pumps
17. Mounting part of steering pump and
switching pump
18. Mounting part of drain piping
A. Inlet port Inlet
B. Outlet port
Specifications
Type: 3-element, single stage, single phase
25. STRUCTURE AND FUNCTION
10-12 WD600-3
TORQUE CONVERTER
Path of power transmission
Flow of power
Lock-up clutch disengaged
• When the lock-up clutch is disengaged, the
connection of drive case (3) and turbine (4) is
disconnected, and the torque converter func-
tions as normal.
The power generated by the engine is trans-
mitted from flywheel (1) to clutch housing (2),
and rotates drive case (3) and pump (6) as one
unit.
The power from pump (6) uses oil as a me-
dium to rotate turbine (4) and transmits the
power from turbine (4) to transmission input
shaft (14).
Lock-up clutch engaged
• When the lock-up clutch is engaged, drive
case (3) and turbine (4) are connected and
form one unit. Stator (11) is rotated by the
rotation of pump (6) and turbine (4).
The power generated by the engine is trans-
mitted from flywheel (1) to clutch housing (2),
and rotates drive case (3) and pump (6) as one
unit. In addition, drive case (3) and turbine
(4) are connected by the clutch, so the power
is transmitted directly from turbine (4) to
transmission input shaft (14) without using oil
as a medium.
