KOMATSU WA270-3 WHEEL LOADER Service Repair Manual SN：WA270H20051 and up

This is the Highly Detailed factory service repair manual for theKOMATSU WA270-3 WHEEL LOADER, this Service Manual has detailed illustrations as well as step by step instructions,It is 100 percents complete and intact. they are specifically written for the do-it-yourself-er as well as the experienced mechanic.KOMATSU WA270-3 WHEEL LOADER Service Repair Workshop Manual provides step-by-step instructions based on the complete dis-assembly of the machine. It is this level of detail, along with hundreds of photos and illustrations, that guide the reader through each service and repair procedure. Complete download comes in pdf format which can work under all PC based windows operating system and Mac also, All pages are printable. Using this repair manual is an inexpensive way to keep your vehicle working properly.

Service Repair Manual Covers:
Safety
General
Structure and function
Testing and adjusting
Disassembly and assembly
Others
File Format: PDF
Compatible: All Versions of Windows & Mac
Language: English
Requirements: Adobe PDF Reader

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8

2. 00-2
CONTENTS
00 SAFETY .............................................................................00-3
01 GENERAL......................................................................... 01-1
10 STRUCTURE AND FUNCTION....................................... 10-1
20 TESTING AND ADJUSTING............................................ 20-1
30 DISASSEMBLY AND ASSEMBLY................................... 30-1
90 OTHERS ........................................................................... 90-1
No. of page

3. SAFETY Safety Notice

00-3
00 SAFETY
Safety Notice
Important Safety Notice
Proper service and repair is extremely important for safe machine operation. Some of the described service
and repair techniques require the use of tools specially designed by Komatsu for the specific purpose.
To prevent injury to workers, the symbolis used to mark safety precautions in this manual. The cautions
accompanying these symbols must always be followed carefully. If any dangerous 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 ca-
refully before operating the machine! Always follow the safety rules valid in your country carefully!
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, glasses, 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.
Never smoke while working. Smoke only in the areas provided for smoking.
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 and install the
safety bar on the frame. If this is not possible, insert the safety pin or use blocks to prevent the work equip-
ment from falling. 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 provide safe footing.

4. Safety Notice SAFETY
00-4
Precautions during Work
11. When measuring hydraulic pressure, check that the measuring tool is correctly assembled before taking any
measurements.
12. 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 com-
pletely from the circuit.
13. 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 carrying out any work on the oil or water circuits.
14. Before starting work, remove the leads from the battery. Always remove the lead from the negative (-) ter-
minal first.
15. 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 prevent the
component from hitting any other part.
Do not work with any part still raised by the hoist or crane.
16. 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.
17. When removing components, be careful not to break or damage the wiring. Damaged wiring may cause
electrical fires.
18. 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.
19. As a general rule, do not use gasoline to wash parts. In particular, use only the minimum of gasoline when
washing electrical parts. Do not smoke!
20. Be sure to assemble all parts again in their original 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.
21. When installing high pressure hoses, make sure that they are not twisted.
Damaged tubes are dangerous, so be extremely careful when installing tubes for high pressure circuits. Al-
so, check that connecting parts are correctly installed.
22. When aligning two holes, never insert your fingers or hand. Be careful not to get your fingers caught in a
hole.
23. 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 particularly careful to check
that they are installed correctly.

5. SAFETY Foreword

00-5
Foreword
General
This shop manual has been prepared as an aid to improve the quality of repairs by giving the service personnel
an accurate understanding of the product and by showing them the correct way to perform repairs and make
judgements. 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
further 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 understanding
of the structure, but also serves as reference material for troubleshooting.
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" to "Causes" are also in-
cluded in this section.
Disassembly and Assembly
This section explains the order to be followed when removing, installing, disassembling or assembling each com-
ponent, as well as precautions to be taken for these operations.
Maintenance Standard
This section gives the judgement standards when inspecting disassembled parts.
NOTE:The specifications contained in this shop manual are subject to change at any time and without any ad-
vance notice. Use the specifications given in the book with the latest date.

6. How to Read the Shop Manual SAFETY
00-6
HowtoReadtheShopManual
Volumes
Shop manuals are issued as a guide to carrying out repairs.
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):
3. Additional pages: Additional pages are indicated by a hyphen (-) and number after the page number. File
as in the example.
Example:
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
Safety Special safety precautions are necessary when performing the work.
Caution Special technical precautions or other precautions for preserving stan-
dards are necessary when performing the work.
Weight Weight of parts of systems. Caution necessary when selecting hoisting
wire, or when working posture is important, etc.
Tightening
torque
Places that require special attention for the tightening torque during
assembly.
Coat Places to be coated with adhesives and libricants, etc.
Oil, water Places where oil, water or fuel must be added, and the capacity.
Drain Places where oil or water must be drained, and quantity to be drained.
10 - 3
Item number (10. Structure and Function)
Consecutive page number for each item
10-4
10-4-1
10-4-2
10-5
Added Pages


4
3
2
5
6

7. SAFETY Hoisting Instructions

00-7
Hoisting Instructions
Heavy parts (25kg or more) must be lifted with a hoist, etc. In the DISASSEMBLY AND
ASSEMBLY section, every part weigthing 25 kg or more is indicated clearly with the
symbol:
If a part cannot be smoothly removed from the machine by hoisting, the following checks should be made:
1. Check for removal of all bolts fastening the part to the relative parts.
2. Check for existence of another part causing interference with the part to be removed.
Wire Ropes
1. Use adequate ropes depending on the weight of parts to be hoisted, refering to the table below:
The allowable load in tons, is given by vertical tensible force.
The allowable load value is estimated to be one-sixth or one-seventh of the breaking strength of the rope
used.
2. Sling wire ropes from the middle portion of the hook.
Slinging near the edge of the hook may cause the rope to slip off the hook during hoisting, and a serious
accident can result. Hooks have maximum strength at the middle portion.
Wire ropes:
(Standard "Z" or "S" twist ropes without galvanizing)
Rope diameter (mm) Allowable load (tons)
10 1.0
11.2 1.4
12.5 1.6
14 2.2
16 2.8
18 3.6
20 4.4
22.4 5.6
30 10.0
40 18.0
50 28.0
60 40.0
4
100% 88% 79% 71% 41%

8. Hoisting Instructions SAFETY
00-8
3. Do not sling a heavy load with one rope alone, but sling with two or more ropes symmetrically wound onto
the load.
αSlinging with one rope may cause turning of the load during hoisting, untwisting of the rope, or slipping of
the rope from its original winding position on the load, which can result in a dangerous accident.
4. Do not sling a heavy load with ropes forming a wide hanging angle from the hook.
When hoisting a load with two or more ropes, the force subjected to each rope will increase with the hanging
angles.
The table below shows the variation of allowable load (kg) when hoisting is made with two ropes, each of
which is allowed to sling up to 1000 kg vertically, at various hanging angles.
When two ropes sling a load vertically, up to 2000 kg of total weight can be suspended. This weight beco-
mes 1000 kg when two ropes make a 120° hanging angle. On the other hand, two ropes are subjected to
an excessive force as large as 4000 kg if they sling a 2000 kg load at a lifting angle of 150°.
300 600 900 1200 1500
1000
2000
2000
1900
1700
1400
1000
500
kg
Lifting angle (α)
Load capacity (kg)
α
Hebewinkel (°)
Gewicht (kg)

9. 01-1
01GENERAL
General overwiew WA270-3 .............................01-3
General overwiew WA270PT-3.........................01-4
Technical datas ................................................01-5
Weight table WA270-3 .....................................01-8
Weight table WA270PT-3 ................................01-9
List of lubricant and water .............................01-10
Maintenance schedule ....................................01-11
Outlines of service..........................................01-12
Torque list ....................................................01-16
General view of controls and gauges ............01-17
Emergency drive ............................................01-18

11.
Dimensions, Operating Data
Buckets (capacities in
accordance with ISO 7546)
m³ 2.1 2.4
Specific density t/m³ 1.8 1.6
Bucket weight without teeth kg 950 1,050
Static tipping weight, straight kg 9,800 9,600
Stat. tipping weight, 40° articulatedkg 8,600 8,500
Breakout force, hydraulic kN 107 101
Hydraulic lifting capacity, on groundkN 112 110
Operating weight kg 12,300 12,350
a Reach at full lift at 45° mm 950 1.000
b Dumping height at 45° mm 2,900 2,860
c Lift height, hinge pin mm 3,78 3,782
The 2.1/2.4 m³ standard buckets
shown in the table can also be
delivered with bolt-on cutting
edges, 2.2/2.5 m³.
d Height at bucket upper edge mm 5,075 5,075
e Digging depth, 0° mm 27 27
f Carry height, hinge pin mm 460 460
A Overall length mm 7,060 7,120
Special buckets:
3.4 m³ light material bucket
B Wheelbase mm 2,900 2,900
C Bucket width mm 2.550 2.550
These values refer to
20,5 R25 tyres.
D Width over tyres mm 2,440 2,440
E Track width mm 1,880 1,880
F Ground clearance mm 460 460
Machine without additional
counterweight
H Overall height mm 3,250 3,250
I:\DTP\BA270GB\ABMES.TBL

270-128
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12.

Dimensions, Operating Data
Buckets (capacities in
accordance with ISO 7546)
m³ 2,0
Specific density t/m³ 1.75
Bucket weight without teeth kg 800
Static tipping weight, straight kg 8200
Stat. tipping weight, 40° articulatedkg 7400
Breakout force, hydraulic kN 96
Hydraulic lifting capacity, on groundkN 99
Operating weight *) kg 12700
a Reach at full lift at 45° mm 1188
b Dumping height at 45° mm 2726
c Lift height, hinge pin mm 3838
d Height at bucket upper edge mm 5385
e Digging depth, 0° mm 126
f Carry height, hinge pin mm 332
A Overall length mm 7060
B Wheelbase mm 2900
C Bucket width mm 2500
These values refer to machines
with
20,5 R25 tyres.
D Width over tyres mm 2440
E Track width mm 1880
F Ground clearance mm 460
*) Machine without additional
counterweight
H Overall height mm 3250
U:\DTP\BA270GB\270PT\ABMES-PT.TBL
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18. 01-10
LUBRICANTS AND OPERATING EQUIPMENT
WA270-3
WA270PT-3
LUBRICANTS AND OPERATING EQUIPMENT
BI abbreviations *), specifications and filling quantities
Lubricants and
operating
equipment
BI abbreviation Quality class
Temperature
range
Viscosity
class
Filling
quantity in
litres
(approx.)
Engine EO engine oil
EO 1540 A EO 1030 A
NRS
CCMC D4
or, if not available,
API CE or
API CF -4 ²)
-10° to 50°C -25° to 20°C -40° to 20°CSAE 15W-40 ¹) SAE 10W-30 SAE 05W-30
16
Transmission EO engine oil EO 10
CCMC D4
or, if not available,
API CD
- SAE 10W 17
Axles with
multi-disc locking
differential
GO gearbox oil GO 90 LS API GL5+LS -
SAE 90 ¹) SAE 85W-90 SAE 80W-90
2x25.5
Hydraulic system,
steering, brakes
HYD hydraulic oil HYD 0530 HVLP, HVLP D -35° to 50°CISO VG 46 ¹)
120
or EO engine oil EO 10
CCMC D4
or, if not available,
API CD
-35° to 40°CSAE 10W
or BIO-E-HYD
hydraulic oil
BIO-E-HYD 0530
HEES
(to VDMA fluid
technology)
-35° to 50°C
ISO VG 46
Cooling system
SP-C long-term
coolant with
anti-frost and rust
protection
SP-C
Anti-frost and rust
protection
56
Fuel tank Diesel fuel ³)
CFPP class B
CFPP class D
CFPP class E
CFPP class F
DIN-EN 590
up to 0°C up to -10°C up to -15°C up to -20°C
185
Grease nipples,
central lubrication
Multi-purpose
grease on a lithium
basis
MPG-A KP2N-20 - NLGI 2
Air-conditioning
Coolant
Refrigerating
machine oil
NRS NRS R134a (CFC-free)
PAG (Polyalcohol glycol oil)
1000 g
150 cm ³
The specified filling capacities are approximate guidelines; test specifications are binding. The selection of the viscosity class depends on the predominantly existing outside temperature. The temperature limits are to be regarded as guidelines which can be exceeded up or down for a brief period.
*) Works filling **) Top-up quantity
²) If no engine oil of the API CE or API CF-4 specification is available, API CC or API CD-classified engine oil can be used
alternatively. The oil change intervals must be split in half in this case, however.
³) If the fuel sulphur content is between 0.5 and 1.0 %, the oil change interval must be 1/2 normal. With a sulphur content of more
than 1.0 %, the oil change interval must be 1/4 normal.
****) BI codes are the "standard lubricants" for construction machinery and vehicles of the Hauptverband der Deutschen
Bauindustrie e.V. (BI). The brochure "Regelschmierstoffe für Baumaschinen- und Fahrzeuge" (Standard Lubricants for Construction
Machinery and Vehicles" can be obtained from bookstores or Bauverlag GmbH, Wiesbaden and Berlin, under the ISBN no.
3-7625-3102-1.
GENERAL LUBRICATION CHART

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MAINTENANCE SCHEDULE
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20.

GREASE:
Grease is used to prevent wear and build-up of noise.
Grease nipples not mentioned in the service section are for
overhaul purposes; for this reason, they do not need to be greased.
If a part becomes sluggish after long use, lubricate with grease.
Wipe off any old grease which is pressed out when lubricating.
Any sand or dirt in the grease causes considerable wear.
OIL:
The oil in the engine and the hydraulic system is subject to extre-
me conditions (high temperatures, high pressure). The quality
decreases, therefore, as operation increases.
Always use oil types complying with the operation and temperature
specifications in the operation and maintenance manual. Always
observe prescribed oil change intervals.
Special attention must be paid when storing, handling and, in
particular, topping up oil and grease to prevent these from becoming
soiled. The majority of functional faults are caused by unclean oil.
Never mix different types or brands of oil.
Always top up the prescribed oil quantities.
Functional disturbances can be caused by too much or too little
oil.
If the oil in the work hydraulic system is not clear (milky), oil or air
is probably penetrating the circuit. In this case, contact you local
Komatsu dealer.
If changing oil, change corresponding oil filter as well.
We recommend having a regular oil analysis carried out by your
local Komatsu dealer in order to establish the condition of the
machine.
),)-" %/,),,2)5/."/,)

21.
FUEL:
The fuel injection pump is a precision instrument. Fuel containing
water or dirt causes damage to the fuel injection pump.
Take maximum care when storing fuel or refuelling to avoid any
soiling.
Always use the fuel prescribed in the operation and maintenance
manual.
Paraffin can precipitate from fuel at temperatures below -15 °C
and block filters and lines. Always use suitable fuel if working in
this temperature range.
Always top up fuel at the end of each working day to prevent air
humidity precipitating and water forming in the fuel tank.
If you want to drain dirt and water from the fuel tank, wait at least
ten minutes after filling so that the swirling foreign bodies can settle
again.
Fuel system will have to be bled if it has been run dry or the filter
has been changed.
Engine oil change periods will have to be reduced by half if fuel is
being used with a sulphur content of 0.5 to 1.0 % and reduced to
one quarter if fuel with a sulphur content of more than 1.0 % is
being used.
BIOLOGICALLY DEGRADABLE HYDRAULIC OILS AND GREASE:
Biologically degradable hydraulic oils and grease - on a diester oil
basis - can be used in Komatsu machines. Please contact our
works dealers for the products approved by us and most suitable
for your requirements.
STORAGE OF OIL AND FUEL:
Store oil and fuel indoors to prevent it being contaminated by water,
dirt or other foreign bodies.
If storing for longer periods, lay the drum on its side so that the
filler opening is located at the side. This prevents moisture from
forming inside the drum.
Drums being stored in the open must be covered with watertight
foil or other appropriate measures taken to protect them.
Always use the principle "first in, first out" to prevent any loss in
quality if storing for longer periods of time, i.e. always use the
oldest oil or fuel first.
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22.
COOLANT:
Always mix coolant according to specifications of machine-related
section of the maintenance manual.
River water contains large quantities of calcium and other foreign
bodies. If using this type of water, scale collects in the engine and
the radiator and restricts heat exchange which can result in
overheating.
Do not use water which is also not suitable as drinking water.
When using anti-freeze, always observe the instructions in the
operating and maintenance manual.
Our machines are supplied with original antifreeze from Komatsu.
This antifreeze prevents corrosion in the cooling system, among
other things, lubricates moving parts, raises the boiling point of
the coolant and must therefore also be used at hot working sites.
Anti-freeze is inflammable and particular attention must therefore
be paid that it does not come into contact with naked flames.
If the anti-freeze level is too low, it can cause overheating and
corrosion to the cooling system because of the air in the coolant.
If the engine overheats and it is necessary to top up with coolant,
wait until the engine has cooled down before topping up.
FILTERS:
Filters are extremely important safety components. They prevent
foreign bodies from entering individual circuits and sections of
equipment and causing damage there.
Change all filters regularly. Further details in this respect can be
found in the operating and maintenance manual. The filters will
have to be changed more frequently if working under extreme
conditions depending on the type of oil and fuel being used, e.g.
with a high sulphur content.
Never attempt to clean cartridge filters and use them again. Always
replace these filters with new ones. If changing oil filters, check
whether there are any metal particles inside the old filter. If this is
the case, contact your local Komatsu dealer.
Do not open the package with the replacement filters until
immediately before installing.
Always use original filters from Komatsu.
),)-" %/,),,2)5/."/,)

23.
DETAILS OF ELECTRICAL SYSTEM:
Never remove or alter electrical components installed in the
machine.
Never install any other electrical components other than those
approved by Komatsu.
Pay attention that no water enters the electrical system if washing
the machine or working in the rain.
Wet wiring or damaged insulation can result in insulation faults in
the electrical system and, consequently, functional faults in the
machine.
If working close to the coast, clean the machinery carefully to
prevent any corrosion.
A foreign source of power must never be connected to the fuses,
the starter switch or the battery relay.
Maintenance of the electrical system consists of:
1. checking the tension of the belt for the three-phase generator
2. checking the belt of the three-phase generator for damage and
wear
3. checking the acid level in the battery.
WEARING PARTS:
Wearing parts such as filter cartridge, air filter element, exhauster,
must be changed when carrying out regular maintenance work or
when the respective wear or dirt level limit has been reached.
This work must be carried out regularly and correctly at the
prescribed intervals in order to ensure economical use of the
machine.
Only use original KOMATSU spare parts
Always quote the part number as listed in the spare parts catalogue
when ordering spare parts.
),)-" %/,),,2)5/."/,)

24.

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Tread diameter Width across
of the bolt (mm) flat (mm)
(a) (b)
Nm kpm
M 6 10 10 1
M 8 13 24 2,4
M 10 17 (15) 48 4,8
M 12 19 83 8,3
M 14 22 130 13
M 16 24 200 20
M 18 27 280 28
M 20 30 390 39
M 22 32 520 52
M 24 36 670 67
M 27 41 980 98
M 30 46 1330 133
M 33 50 1790 179
M 36 55 2310 231
M 39 60 2970 297
NOTE
When tightening panels or other parts having tightening fixtures made of plastic, be careful not to use
excessive tightening torque: doing so will damage the plastic parts.


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27. STRUCTURE AND FUNCTION POWER TRAIN
10-1
10STRUCTURE AND FUNCTION
Power train ...................................................... 10-3
Power train system .......................................... 10-4
Torque converter and gearbox piping ............... 10-6
Torque converter.............................................. 10-8
Principle of operation ..................................... 10-10
Powershift transmission................................. 10-11
Gear change control ...................................... 10-11
Construction of transmission 4WG-150..........10-13
Electro-hydraulic control valve .......................10-18
Inductive sender / Proximity switch ................10-19
Pressure check points for 4WG - 150 ...........10-29
Solenoid expansions valve and
overlap valve ................................................. 10-29
Transmission hydraulic
system diagram ............................................. 10-31
Control valve with solenoid
expansions valve ........................................... 10-33
Thermostat valve............................................10-38
Drive shaft .....................................................10-41
Front and rear axle.........................................10-42
Differential .....................................................10-43
Wheel hub .....................................................10-46
Axle mountings...............................................10-51
Steering articulation joint ................................10-52
Assembly of the steering joint.........................10-53
Steering system .............................................10-61
Steering column, orbit roll ..............................10-62
Hydraulic steering system ..............................10-63
Control sleeve................................................10-68
Steering and working
hydraulic pump .............................................. 10-70
Steering orbit roll ........................................... 10-71
Steering valve block ...................................... 10-72
Steering damper ............................................ 10-74
Steering cylinder location ............................... 10-75
Steering cylinder ............................................ 10-76
Emergency steering pump ............................. 10-77
Brake system............................................... 10-102
Brake system circuit .................................... 10-103
Gear pump .................................................. 10-104
Pressure filter .............................................. 10-105
Brake pressure regulating valve .................. 10-106
Brake operation ........................................... 10-107
Brake valve .................................................. 10-108
Pressure switch ........................................... 10-111
Accumulator (Brake system) ....................... 10-112
Hydraulic accumulator ................................. 10-113
Main brakes ................................................. 10-114
Piston seals ................................................. 10-115
Hand brake (parking brake) ......................... 10-116
Work equipment hydraulic system ............... 10-132
Pilot servo system ....................................... 10-133
Oil cooler system ......................................... 10-134
Work equipment hydraulic
system diagram ........................................... 10-136
Steering and working
hydraulic pump ............................................ 10-138
Cut-off valve ................................................ 10-139
Main control valve ........................................ 10-140
Shock and anticavitation valve..................... 10-142
Anticavitation valve ...................................... 10-143
Pressure control valve ................................. 10-144
Joystick, servo control valve ........................ 10-145
Lift cylinder ..................................................10-147
Tilt cylinder...................................................10-149
ALS-Control unit ..........................................10-150
ALS hydraulic system ..................................10-151
Hydraulic accumulator .................................10-154
Lifting frame .................................................10-156
Bucket positioner and boom kick-out ...........10-160
Machine monitor system ..............................10-165
Pre-heater plug ............................................10-172
Electric wiring diagrams ...............................10-170
Air-conditioner .............................................10-301

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30. STRUCTURE AND FUNCTION POWER TRAIN
10-4
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49. STRUCTURE AND FUNCTION TRANSMISSION
10-23
TRANSMISSION HYDRAULIC SYSTEM DIAGRAM
Refer also to fig. 6 and 7
17. Thermostat valve
18. Heat changer
Press. drop ≤ 1bar
19. Filter
Filtration µm: ß
30
≥20
ß
10
≥1.5
Filtration area cm
2
: 2450
20. Oil pump
p=16
+2
bar
Q
p
=52 l/min
-1
at 2000rpm
21. Check valves 0,15bar
22. Spring accumulator
23. Check valve 0,5bar
24. Dashboard torque converter
output temerature
25. Dashboard pressure gauge
26. Lubrication
27. Sump
28. Torque converter
SDV. Control pressure valve 16
+2
bar
RDV. Reducing valve 10 bar
WSV.Torque converter safety valve 8.5 bar
WDV.Torque converter pressure holding valve
DSV. Pressure control valve
ÜSV. Overlap valve
SPV. Expansion valve
EV. Breather valve
Clutch pressure
Reduced pressure
Modulated pressure
Torque converter input pressure
Torque converter output pressure
Lubrication
Return to sump
10-23

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