KOMATSU WA150-5 WHEEL LOADER Service Repair Manual SN：65001 and up

00-1
MACHINE MODEL SERIAL NUMBER
WA150-5 65001 and up
• This shop manual may contain attachments and optional equipment that are not available in your
area. Please consult your local Komatsu distributor for those items you may require.
Materials and specifications are subject to change without notice.
• WA150-5 mounts the SAA4D102E-2 engine.
For details of the engine, see the 102 Series Engine Shop Manual.
SEBM033805
© 2005
All Rights Reserved
Printed in Japan 04-05(02)
(5)

00-2 WA150-5
CONTENTS
No. of page
01 GENERAL ................................................................................................................01-1
10 STRUCTURE, FUNCTION AND
MAINTENANCE STANDARD......................................................................10-1
20 TESTING AND ADJUSTING .......................................................................20-1
30 DISASSEMBLY AND ASSEMBLY ..........................................................30-1
90 OTHERS ....................................................................................................................90-1
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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.

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.

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.

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

FOREWORD HOISTING INSTRUCTIONS
00-7
HOISTING INSTRUCTIONS
HOISTING
k Heavy parts (25 kg or more) must be lifted
with a hoist, etc. In the DISASSEMBLY
AND ASSEMBLY section, every part
weighing 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, referring to
the table below:
Wire ropes
(Standard "Z" or "S" twist ropes
without galvanizing)
! 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 max-
imum strength at the middle portion.
3) Do not sling a heavy load with one rope alone,
but sling with two or more ropes symmetrically
wound onto the load.
k Slinging 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 kN {kg}
when hoisting is made with two ropes, each of
which is allowed to sling up to 9.8 kN {1000 kg}
vertically, at various hanging angles.
When two ropes sling a load vertically, up to
19.6 kN {2000 kg} of total weight can be sus-
pended. This weight becomes 9.8 kN {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 39.2 kN {4000
kg} if they sling a 19.6 kN {2000 kg} load at a
lifting angle of 150°.
Rope diameter Allowable load
mm kN tons
10
11.5
12.5
14
16
18
20
22.4
30
40
50
60
9.8
13.7
15.7
21.6
27.5
35.3
43.1
54.9
98.1
176.5
274.6
392.2
1.0
1.4
1.6
2.2
2.8
3.6
4.4
5.6
10.0
18.0
28.0
40.0
4
SAD00479
41%71%79%88%100%

FOREWORD METHOD OF DISASSEMBLING, CONNECTING PUSH-PULL TYPE COUPLER
00-8
METHOD OF DISASSEMBLING, CONNECTING PUSH-PULL TYPE COUPLER
k Before carrying out the following work, release
the residual pressure from the hydraulic tank.
For details, see TESTING AND ADJUSTING,
Releasing residual pressure from hydraulic
tank.
k Even if the residual pressure is released from
the hydraulic tank, some hydraulic oil flows out
when the hose is disconnected. Accordingly,
prepare an oil receiving container.
Disconnection
1) Release the residual pressure from the hydrau-
lic tank. For details, see TESTING AND
ADJUSTING, Releasing residual pressure from
hydraulic tank.
2) Hold adapter (1) and push hose joint (2) into
mating adapter (3). (See Fig. 1)
! The adapter can be pushed in about 3.5
mm.
! Do not hold rubber cap portion (4).
3) After hose joint (2) is pushed into adapter (3),
press rubber cap portion (4) against (3) until it
clicks. (See Fig. 2)
4) Hold hose adapter (1) or hose (5) and pull it out.
(See Fig. 3)
! Since some hydraulic oil flows out, prepare
an oil receiving container.
Connection
1) Hold hose adapter (1) or hose (5) and insert it in
mating adapter (3), aligning them with each
other. (See Fig. 4)
! Do not hold rubber cap portion (4).
2) After inserting the hose in the mating adapter
perfectly, pull it back to check its connecting
condition. (See Fig. 5)
! When the hose is pulled back, the rubber
cap portion moves toward the hose about
3.5 mm. This does not indicate abnormality,
however.
Type 1

FOREWORD METHOD OF DISASSEMBLING, CONNECTING PUSH-PULL TYPE COUPLER
00-9
Type 2 Type 3Disassembly
1) Hold the mouthpiece of the tightening portion
and push body (2) in straight until sliding pre-
vention ring (1) contacts contact surface a of
the hexagonal portion at the male end.
2) Hold in the condition in Step 1), and turn
lever (4) to the right (clockwise).
3) Hold in the condition in Steps 1) and 2), and
pull out whole body (2) to disconnect it.
1) Hold the mouthpiece of the tightening portion
2) Hold in the condition in Step 1), and push
until cover (3) contacts contact surface a of
3) Hold in the condition in Steps 1) and 2), and
pull out whole body (2) to disconnect it.
Connection
• Hold the mouthpiece of the tightening portion
the hexagonal portion at the male end to con-
nect it.
• Hold the mouthpiece of the tightening portion
the hexagonal portion at the male end to con-
nect it.

FOREWORD COATING MATERIALS
00-10
COATING MATERIALS
! The recommended coating materials such as adhesives, gasket sealants and greases used for disassembly
and assembly are listed below.
! For coating materials not listed below, use the equivalent of products shown in this list.
Category Komatsu code Part No. Q’ty Container Main applications, features
Adhesives
LT-1A 790-129-9030 150 g Tube
• Used to prevent rubber gaskets, rubber
cushions, and cock plug from coming out.
LT-1B 790-129-9050
20 g
(2 pcs.)
Polyethylene
container
• Used in places requiring an immediately
effective, strong adhesive.
Used for plastics (except polyethylene,
polyprophylene, tetrafluoroethlene and
vinyl chloride), rubber, metal and non-
metal.
LT-2 09940-00030 50 g
Polyethylene
container
• Features:
Resistance to heat and chemicals
• Used for anti-loosening and sealant
purpose for bolts and plugs.
LT-3
790-129-9060
(Set of adhesive
and hardening
agent)
Adhesive:
1 kg
Hardening
agent:
500 g
Can
• Used as adhesive or sealant for metal,
glass and plastic.
LT-4 790-129-9040 250 g
Polyethylene
container
• Used as sealant for machined holes.
Holtz
MH 705
790-126-9120 75 g Tube
• Used as heat-resisting sealant for
repairing engine.
Three bond
1735
790-129-9140 50 g
Polyethylene
container
• Quick hardening type adhesive
• Cure time: within 5 sec. to 3 min.
• Used mainly for adhesion of metals,
rubbers, plastics and woods.
Aron-alpha
201
790-129-9130 2 g
Polyethylene
container
• Quick hardening type adhesive
• Quick cure type
(max. strength after 30 minutes)
• Used mainly for adhesion of rubbers,
plastics and metals.
Loctite
648-50
79A-129-9110 50 cc
Polyethylene
container
• Resistance to heat, chemicals
• Used at joint portions subject to high
temperatures.
Gasket
sealant
LG-1 790-129-9010 200 g Tube
• Used as adhesive or sealant for gaskets
and packing of power train case, etc.
LG-5 790-129-9080 1 kg Can
• Used as sealant for various threads, pipe
joints, flanges.
• Used as sealant for tapered plugs,
elbows, nipples of hydraulic piping.
LG-6 790-129-9020 200 g Tube
• Features: Silicon based, resistance to
heat, cold
• Used as sealant for flange surface, tread.
• Used as sealant for oil pan, final drive
case, etc.
LG-7 790-129-9070 1 kg Tube
• Features: Silicon based, quick hardening
type
• Used as sealant for flywheel housing,
intake manifold, oil pan, thermostat
housing, etc.
Three bond
1211
790-129-9090 100 g Tube
• Used as heat-resisting sealant for
repairing engine.
Three bond
1207B
419-15-18131 100 g Tube
• Features: Silicone type, heat resistant,
vibration resistant, and impact resistant
sealing material
• Used as sealing material for transfer case

FOREWORD COATING MATERIALS
00-11
Molybdenum
disulphide
lubricant
LM-G 09940-00051 60 g Can
• Used as lubricant for sliding portion (to
prevent from squeaking).
LM-P 09940-00040 200 g Tube
• Used to prevent seizure or scuffling of the
thread when press fitting or shrink fitting.
• Used as lubricant for linkage, bearings,
etc.
Grease
G2-LI
SYG2-400LI
SYG2-350LI
SYG2-400LI-A
SYG2-160LI
SYGA-160CNLI
Various Various
• General purpose type
G2-CA
SYG2-400CA
SYG2-350CA
SYG2-400CA-A
SYG2-160CA
SYGA-160CNCA
Various Various
• Used for normal temperature, light load
bearing at places in contact with water or
steam.
Molybdenum
disulphide
grease
LM-G (G2-M)
SYG2-400M
SYG2-400M-A
SYGA-16CNM
400 g × 10
400 g × 20
16 kg
Bellows type
Bellows type
Can
• Used for heavy load portion
Hyper White
Grease G2-T
G0-T (*)
*: For use in
cold district
SYG2-400T-A
SYG2-16CNT
SYG0-400T-A (*)
SYG0-16CNT (*)
400 g
16 kg
Bellows type
Can
• Seizure resistance and heat resistance
higher than molybdenum disulfide grease
• Since this grease is white, it does not
stand out against machine body.
Biogrease G2B
G2-BT (*)
*: For high
temperature
and large load
SYG2-400B
SYGA-16CNB
SYG2-400BT (*)
SYGA-16CNBT (*)
400 g
16 kg
Bellows type
Can
• Since this grease is decomposed by
bacteria in short period, it has less effects
on microorganisms, animals, and plants.
Primer
SUNSTAR
PAINT PRIMER
580 SUPER
417-926-3910
20 ml
Glass
container
Adhesiveforcabglass
• Used as primer for cab side
(Using limit: 4 months)
SUNSTAR
GLASSPRIMER
580 SUPER
20 ml
Glass
container
• Used as primer for glass side
SUNSTAR
PAINT PRIMER
435-95
22M-54-27230 20 ml
Glass
container
• Used as primer for painted surface on
cab side
SUNSTAR
GLASSPRIMER
435-41
22M-54-27240 150 ml Can
• Used as primer for black ceramic-
coated surface on glass side and for
hard polycarbonate-coated surface
SUNSTAR
SASH PRIMER
GP-402
22M-54-27250 20 ml
Glass
container
• Used as primer for sash (Alumite).
Adhesive
SUNSTAR
PENGUINE
SUPER 560
22M-54-27210 320 ml
Ecocart
(Special
container)
• Used as adhesive for glass.
SUNSTAR
PENGUINE
SEAL 580
SUPER “S” or
“W”
417-926-3910 320 ml
Polyethylene
container
• “S” is used for high-temperature
season (April - October) and “W” for
low-temperature season (November -
April) as adhesive for glass.
Sika Japan,
Sikaflex 256HV
20Y-54-39850 310 ml
Polyethylene
container
• Used as adhesive for glass.
Caulking
material
SUNSTAR
PENGUINE
SEAL No. 2505
417-926-3920 320 ml
Polyethylene
container
• Used to seal joints of glass parts.
SEKISUI
SILICONE
SEALANT
20Y-54-55130 333 ml
Polyethylene
container
• Used to seal front window.
GE TOSHIBA
SILICONES
TOSSEAL 381
22M-54-27220 333 ml Cartridge
• Used to seal joint of glasses.
Translucent white seal.
Category Komatsu code Part No. Q’ty Container Main applications, features

FOREWORD STANDARD TIGHTENING TORQUE
00-12
STANDARD TIGHTENING TORQUE
STANDARD TIGHTENING TORQUE TABLE (WHEN USING TORQUE WRENCH)
! In the case of metric nuts and bolts for which there is no special instruction, tighten to the torque given in
the table below.
TABLE OF TIGHTENING TORQUES FOR FLARED NUTS
! In the case of flared nuts for which there is no
special instruction, tighten to the torque given in
the table below.
Thread diameter
of bolt
Width across
flats
Tightening torque
mm mm Nm kgm
6
8
10
12
14
10
13
17
19
22
11.8 – 14.7
27 – 34
59 – 74
98 – 123
153 – 190
1.2 – 1.5
2.8 – 3.5
6 – 7.5
10 – 12.5
15.5 – 19.5
16
18
20
22
24
24
27
30
32
36
235 – 285
320 – 400
455 – 565
610 – 765
785 – 980
23.5 – 29.5
33 – 41
46.5 – 58
62.5 – 78
80 – 100
27
30
33
36
39
41
46
50
55
60
1150 – 1440
1520 – 1910
1960 – 2450
2450 – 3040
2890 – 3630
118 – 147
155 – 195
200 – 250
250 – 310
295 – 370
Thread diameter
of bolt
Width across
flats
Tightening torque
mm mm Nm kgm
6
8
10
12
10
13
14
27
5.9 – 9.8
13.7 – 23.5
34.3 – 46.1
74.5 – 90.2
0.6 – 1.0
1.4 – 2.4
3.5 – 4.7
7.6 – 9.2
SAD00483
Sealing surface
Thread diameter Width across flat Tightening torque
mm mm Nm kgm
14
18
22
24
30
33
36
42
19
24
27
32
36
41
46
55
24.5 ± 4.9
49 ± 19.6
78.5 ± 19.6
137.3 ± 29.4
176.5 ± 29.4
196.1 ± 49
245.2 ± 49
294.2 ± 49
2.5 ± 0.5
5 ± 2
8 ± 2
14 ± 3
18 ± 3
20 ± 5
25 ± 5
30 ± 5

00-13
TABLE OF TIGHTENING TORQUES FOR SPLIT FLANGE BOLTS
! In the case of split flange bolts for which there is no special instruction, tighten to the torque given in the
table below.
TABLE OF TIGHTENING TORQUES FOR O-RING BOSS PIPING JOINTS
! Unless there are special instructions, tighten the O-ring boss piping joints to the torque below.
TABLE OF TIGHTENING TORQUES FOR O-RING BOSS PLUGS
! Unless there are special instructions, tighten the O-ring boss plugs to the torque below.
Thread diameter Width across flat Tightening torque
mm mm Nm kgm
10
12
16
14
17
22
59 – 74
98 – 123
235 – 285
6 – 7.5
10 – 12.5
23.5 – 29.5
Norminal No.
Thread diameter Width across flat Tightening torque (Nm {kgm})
mm mm Range Target
02
03, 04
05, 06
10, 12
14
14
20
24
33
42
Varies depending
on type of
connector.
35 – 63 {3.5 – 6.5}
84 – 132 {8.5 – 13.5}
128 – 186 {13.0 – 19.0}
363 – 480 {37.0 – 49.0}
746 – 1010 {76.0 – 103}
44 {4.5}
103 {10.5}
157 {16.0}
422 {43.0}
883 {90.0}
Norminal No.
Thread diameter Width across flat Tightening torque (Nm {kgm})
mm mm Range Target
08
10
12
14
16
18
20
24
30
33
36
42
52
08
10
12
14
16
18
20
24
30
33
36
42
52
14
17
19
22
24
27
30
32
32
—
36
—
—
5.88 – 8.82 {0.6 – 0.9}
9.8 – 12.74 {1.0 – 1.3}
14.7 – 19.6 {1.5 – 2.0}
19.6 – 24.5 {2.0 – 2.5}
24.5 – 34.3 {2.5 – 3.5}
34.3 – 44.1 {3.5 – 4.5}
44.1 – 53.9 {4.5 – 5.5}
58.8 – 78.4 {6.0 – 8.0}
93.1 – 122.5 {9.5 – 12.5}
107.8 – 147.0 {11.0 – 15.0}
127.4 – 176.4 {13.0 – 18.0}
181.3 – 240.1 {18.5 – 24.5}
274.4 – 367.5 {28.0 – 37.5}
7.35 {0.75}
11.27 {1.15}
17.64 {1.8}
22.54 {2.3}
29.4 {3.0}
39.2 {4.0}
49.0 {5.0}
68.6 {7.0}
107.8 {11.0}
124.4 {13.0}
151.9 {15.5}
210.7 {21.5}
323.4 {33.0}

00-14
TIGHTENING TORQUE FOR 102 AND 114 ENGINE SERIES
1) BOLT AND NUTS
Use these torques for bolts and nuts (unit: mm) of Cummins Engine.
2) EYE JOINTS
Use these torques for eye joints (unit: mm) of Cummins Engine.
3) TAPERED SCREWS
Use these torques for tapered screws (unit: inch) of Cummins Engine.
TIGHTENING TORQUE TABLE FOR HOSES (TAPER SEAL TYPE AND FACE SEAL TYPE)
! Tighten the hoses (taper seal type and face seal type) to the following torque, unless otherwise specified.
! Apply the following torque when the threads are coated (wet) with engine oil.
Thread diameter Tightening torque
mm Nm kgm
6
8
10
12
10 0 2
24 0 4
43 0 6
77 0 12
1.02 0 0.20
2.45 0 0.41
4.38 0 0.61
7.85 0 1.22
mm Nm kgm
6
8
10
12
14
8 0 2
10 0 2
12 0 2
24 0 4
36 0 5
0.81 0 0.20
1.02 0 0.20
1.22 0 0.20
2.45 0 0.41
3.67 0 0.51
inch Nm kgm
1 / 16
1 / 8
1 / 4
3 / 8
1 / 2
3 / 4
1
3 0 1
8 0 2
12 0 2
15 0 2
24 0 4
36 0 5
60 0 9
0.31 0 0.10
0.81 0 0.20
1.22 0 0.20
1.53 0 0.20
2.45 0 0.41
3.67 0 0.51
6.12 0 0.92
Nominal size
of hose
Widthacross
flats
Tightening torque (Nm {kgm})
Taper seal
type Face seal type
Range Target
Thread size
(mm)
Nominal thread
size - Threads per
inch, Thread series
Root diameter
(mm) (Reference)
02 19
34 – 54 {3.5 – 5.5} 44 {4.5} – – 18UN 14.3
34 – 63 {3.5 – 6.5} 44 {4.5} 14 – –
03
22 54 – 93 {5.5 – 9.5} 74 {7.5} – – 16UN 17.5
24 59 – 98 {6.0 – 10.0} 78 {8.0} 18 – –
04 27 84 – 132 {8.5 – 13.5} 103 {10.5} 22 – 16UN 20.6
05 32 128 – 186 {13.0 – 19.0} 157 {16.0} 24 1 – 14UNS 25.4
06 36 177 – 245 {18.0 – 25.0} 216 {22.0} 30 1 – 12UN 30.2
(10) 41 177 – 245 {18.0 – 25.0} 216 {22.0} 33 – –
(12) 46 197 – 294 {20.0 – 30.0} 245 {25.0} 36 – –
(14) 55 246 – 343 {25.0 – 35.0} 294 {30.0} 42 – –
9
—
16
11
—
16
13
—
16
3
—
16

FOREWORD ELECTRIC WIRE CODE
00-15
ELECTRIC WIRE CODE
In the wiring diagrams, various colors and symbols are employed to indicate the thickness of wires.
This wire code table will help you understand WIRING DIAGRAMS.
Example: 5WB indicates a cable having a nominal number 5 and white coating with black stripe.
CLASSIFICATION BY THICKNESS
CLASSIFICATION BY COLOR AND CODE
Norminal
number
Copper wire
Cable O.D.
(mm)
Current
rating
(A)
Applicable circuit
Number of
strands
Dia. of
strands
(mm2
)
Cross
section
(mm2
)
0.85 11 0.32 0.88 2.4 12 Starting, lighting, signal
etc.
2 26 0.32 2.09 3.1 20 Lighting, signal etc.
5 65 0.32 5.23 4.6 37 Charging and signal
15 84 0.45 13.36 7.0 59 Starting (Glow plug)
40 85 0.80 42.73 11.4 135 Starting
60 127 0.80 63.84 13.6 178 Starting
100 217 0.80 109.1 17.6 230 Starting
Priori-
ty
Circuits
Classi-
fication
Charging Ground Starting Lighting Instrument Signal Other
1 Pri-
mary
Code W B B R Y G L
Color White Black Black Red Yellow Green Blue
2
Auxi-
liary
Code WR — BW RW YR GW LW
Color White & Red — White & Black Red & White Rellow & Red Green & White Blue & White
3
Code WB — BY RB YB GR LR
Color White & Black — Black & Yellow Red & Black Yellow & Black Green & Red Blue & Yellow
4
Code WL — BR RY YG GY LY
Color White & Blue — Black & Red Red & Yellow
Yellow &
Green
Green &
Yellow Blue & Yellow
5
Code WG — — RG YL GB LB
Color White & Green — — Red & Green Yellow & Blue Green & Black Blue & Black
6
Code — — — RL YW GL
Color — — — Red & Blue Yellow & White Green & Blue

FOREWORD CONVERSION TABLE
00-16
CONVERSION TABLE
METHOD OF USING THE CONVERSION TABLE
The Conversion Table in this section is provided to enable simple conversion of figures. For details of the
method of using the Conversion Table, see the example given below.
EXAMPLE
• Method of using the Conversion Table to convert from millimeters to inches
1. Convert 55 mm into inches.
(1) Locate the number 50 in the vertical column at the left side, take this as (A), then draw a horizontal line
from (A).
(2) Locate the number 5 in the row across the top, take this as (B), then draw a perpendicular line down
from (B).
(3) Take the point where the two lines cross as (C). This point (C) gives the value when converting from
millimeters to inches. Therefore, 55 mm = 2.165 inches.
2. Convert 550 mm into inches.
(1) The number 550 does not appear in the table, so divide by 10 (move the decimal point one place to the
left) to convert it to 55 mm.
(2) Carry out the same procedure as above to convert 55 mm to 2.165 inches.
(3) The original value (550 mm) was divided by 10, so multiply 2.165 inches by 10 (move the decimal point
one place to the right) to return to the original value. This gives 550 mm = 21.65 inches.
Millimeters to inches
1 mm = 0.03937 in
0 1 2 3 4 5 6 7 8 9
0
10
20
30
40
50
60
70
80
90
0
0.394
0.787
1.181
1.575
1.969
2.362
2.756
3.150
3.543
0.039
0.433
0.827
1.220
1.614
2.008
2.402
2.795
3.189
3.583
0.079
0.472
0.866
1.260
1.654
2.047
2.441
2.835
3.228
3.622
0.118
0.512
0.906
1.299
1.693
2.087
2.480
2.874
3.268
3.661
0.157
0.551
0.945
1.339
1.732
2.126
2.520
2.913
3.307
3.701
0.197
0.591
0.984
1.378
1.772
2.165
2.559
2.953
3.346
3.740
0.236
0.630
1.024
1.417
1.811
2.205
2.598
2.992
3.386
3.780
0.276
0.669
1.063
1.457
1.850
2.244
2.638
3.032
3.425
3.819
0.315
0.709
1.102
1.496
1.890
2.283
2.677
3.071
3.465
3.858
0.354
0.748
1.142
1.536
1.929
2.323
2.717
3.110
3.504
3.898
(A)
(B)
(C)

00-17
Millimeters to Inches
1 mm = 0.03937 in
Kilogram to Pound
1 kg = 2.2046 lb
0 1 2 3 4 5 6 7 8 9
0
10
20
30
40
50
60
70
80
90
0
0.394
0.787
1.181
1.575
1.969
2.362
2.756
3.150
3.543
0.039
0.433
0.827
1.220
1.614
2.008
2.402
2.795
3.189
3.583
0.079
0.472
0.866
1.260
1.654
2.047
2.441
2.835
3.228
3.622
0.118
0.512
0.906
1.299
1.693
2.087
2.480
2.874
3.268
3.661
0.157
0.551
0.945
1.339
1.732
2.126
2.520
2.913
3.307
3.701
0.197
0.591
0.984
1.378
1.772
2.165
2.559
2.953
3.346
3.740
0.236
0.630
1.024
1.417
1.811
2.205
2.598
2.992
3.386
3.780
0.276
0.669
1.063
1.457
1.850
2.244
2.638
3.032
3.425
3.819
0.315
0.709
1.102
1.496
1.890
2.283
2.677
3.071
3.465
3.858
0.354
0.748
1.142
1.536
1.929
2.323
2.717
3.110
3.504
3.898
0 1 2 3 4 5 6 7 8 9
0
10
20
30
40
50
60
70
80
90
0
22.05
44.09
66.14
88.18
110.23
132.28
154.32
176.37
198.42
2.20
24.25
46.30
68.34
90.39
112.44
134.48
156.53
178.57
200.62
4.41
26.46
48.50
70.55
92.59
114.64
136.69
158.73
180.78
202.83
6.61
28.66
50.71
72.75
94.80
116.85
138.89
160.94
182.98
205.03
8.82
30.86
51.91
74.96
97.00
119.05
141.10
163.14
185.19
207.24
11.02
33.07
55.12
77.16
99.21
121.25
143.30
165.35
187.39
209.44
13.23
35.27
57.32
79.37
101.41
123.46
145.51
167.55
189.60
211.64
15.43
37.48
59.53
81.57
103.62
125.66
147.71
169.76
191.80
213.85
17.64
39.68
61.73
83.78
105.82
127.87
149.91
171.96
194.01
216.05
19.84
41.89
63.93
85.98
108.03
130.07
152.12
174.17
196.21
218.26

00-18
Liter to U.S. Gallon
1l = 0.2642 U.S. Gal
Liter to U.K. Gallon
1l = 0.21997 U.K. Gal
0 1 2 3 4 5 6 7 8 9
0
10
20
30
40
50
60
70
80
90
0
2.642
5.283
7.925
10.567
13.209
15.850
18.492
21.134
23.775
0.264
2.906
5.548
8.189
10.831
13.473
16.115
18.756
21.398
24.040
0.528
3.170
5.812
8.454
11.095
13.737
16.379
19.020
21.662
24.304
0.793
3.434
6.076
8.718
11.359
14.001
16.643
19.285
21.926
24.568
1.057
3.698
6.340
8.982
11.624
14.265
16.907
19.549
22.190
24.832
1.321
3.963
6.604
9.246
11.888
14.529
17.171
19.813
22.455
25.096
1.585
4.227
6.869
9.510
12.152
14.795
17.435
20.077
22.719
25.361
1.849
4.491
7.133
9.774
12.416
15.058
17.700
20.341
22.983
25.625
2.113
4.755
7.397
10.039
12.680
15.322
17.964
20.605
23.247
25.889
2.378
5.019
7.661
10.303
12.944
15.586
18.228
20.870
23.511
26.153
0 1 2 3 4 5 6 7 8 9
0
10
20
30
40
50
60
70
80
90
0
2.200
4.399
6.599
8.799
10.998
13.198
15.398
17.598
19.797
0.220
2.420
4.619
6.819
9.019
11.281
13.418
15.618
17.818
20.017
0.440
2.640
4.839
7.039
9.239
11.438
13.638
15.838
18.037
20.237
0.660
2.860
5.059
7.259
9.459
11.658
13.858
16.058
18.257
20.457
0.880
3.080
5.279
7.479
9.679
11.878
14.078
16.278
18.477
20.677
1.100
3.300
5.499
7.969
9.899
12.098
14.298
16.498
18.697
20.897
1.320
3.520
5.719
7.919
10.119
12.318
14.518
16.718
18.917
21.117
1.540
3.740
5.939
8.139
10.339
12.528
14.738
16.938
19.137
21.337
1.760
3.950
6.159
8.359
10.559
12.758
14.958
17.158
19.357
21.557
1.980
4.179
6.379
8.579
10.778
12.978
15.178
17.378
19.577
21.777

00-19
kgm to ft. lb
1 kgm = 7.233 ft. lb
0 1 2 3 4 5 6 7 8 9
0
10
20
30
40
50
60
70
80
90
100
110
120
130
140
150
160
170
180
190
0
72.3
144.7
217.0
289.3
361.7
434.0
506.3
578.6
651.0
723.3
795.6
868.0
940.3
1012.6
1084.9
1157.3
1129.6
1301.9
1374.3
7.2
79.6
151.9
224.2
296.6
368.9
441.2
513.5
585.9
658.2
730.5
802.9
875.2
947.5
1019.9
1092.2
1164.5
1236.8
1309.2
1381.5
14.5
86.8
159.1
231.5
303.8
376.1
448.5
520.8
593.1
665.4
737.8
810.1
882.4
954.8
1027.1
1099.4
1171.7
1244.1
1316.4
1388.7
21.7
94.0
166.4
238.7
311.0
383.4
455.7
528.0
600.3
672.7
745.0
817.3
889.7
962.0
1034.3
1106.6
1179.0
1251.3
1323.6
1396.0
28.9
101.3
173.6
245.9
318.3
390.6
462.9
535.2
607.6
679.9
752.2
824.6
896.9
969.2
1041.5
1113.9
1186.2
1258.5
1330.9
1403.2
36.2
108.5
180.8
253.2
325.5
397.8
470.2
542.5
614.8
687.1
759.5
831.8
904.1
976.5
1048.8
1121.1
1193.4
1265.8
1338.1
1410.4
43.4
115.7
188.1
260.4
332.7
405.1
477.4
549.7
622.0
694.4
766.7
839.0
911.4
983.7
1056.0
1128.3
1200.7
1273.0
1345.3
1417.7
50.6
123.0
195.3
267.6
340.0
412.3
484.6
556.9
629.3
701.6
773.9
846.3
918.6
990.9
1063.2
1135.6
1207.9
1280.1
1352.6
1424.9
57.9
130.2
202.5
274.9
347.2
419.5
491.8
564.2
636.5
708.8
781.2
853.5
925.8
998.2
1070.5
1142.8
1215.1
1287.5
1359.8
1432.1
65.1
137.4
209.8
282.1
354.4
426.8
499.1
571.4
643.7
716.1
788.4
860.7
933.1
1005.4
1077.7
1150.0
1222.4
1294.7
1367.0
1439.4

00-20
kg/cm2
to lb/in2
1kg/cm2
= 14.2233 lb/in2
0 1 2 3 4 5 6 7 8 9
0
10
20
30
40
50
60
70
80
90
100
110
120
130
140
150
160
170
180
190
200
210
220
230
240
0
142.2
284.5
426.7
568.9
711.2
853.4
995.6
1138
1280
1422
1565
1707
1849
1991
2134
2276
2418
2560
2702
2845
2987
3129
3271
3414
14.2
156.5
298.7
440.9
583.2
725.4
867.6
1010
1152
1294
1437
1579
1721
1863
2005
2148
2290
2432
2574
2717
2859
3001
3143
3286
3428
28.4
170.7
312.9
455.1
597.4
739.6
881.8
1024
1166
1309
1451
1593
1735
1877
2020
2162
2304
2446
2589
2731
2873
3015
3158
3300
3442
42.7
184.9
327.1
469.4
611.6
753.8
896.1
1038
1181
1323
1465
1607
1749
1892
2034
2176
2318
2460
2603
2745
2887
3030
3172
3314
3456
56.9
199.1
341.4
483.6
625.8
768.1
910.3
1053
1195
1337
1479
1621
1764
1906
2048
2190
2333
2475
2617
2759
2901
3044
3186
3328
3470
71.1
213.4
355.6
497.8
640.1
782.3
924.5
1067
1209
1351
1493
1636
1778
1920
2062
2205
2347
2489
2631
2773
2916
3058
3200
3343
3485
85.3
227.6
369.8
512.0
654.3
796.5
938.7
1081
1223
1365
1508
1650
1792
1934
2077
2219
2361
2503
2646
2788
2930
3072
3214
3357
3499
99.6
241.8
384.0
526.3
668.5
810.7
953.0
1095
1237
1380
1522
1664
1806
1949
2091
2233
2375
2518
2660
2802
2944
3086
3229
3371
3513
113.8
256.0
398.3
540.5
682.7
825.0
967.2
1109
1252
1394
1536
1678
1821
1963
2105
2247
2389
2532
2674
2816
2958
3101
3243
3385
3527
128.0
270.2
412.5
554.7
696.9
839.2
981.4
1124
1266
1408
1550
1693
1835
1977
2119
2262
2404
2546
2688
2830
2973
3115
3257
3399
3542

00-21
Temperature
Fahrenheit-Centigrade Conversion ; a simple way to convert a Fahrenheit temperature reading into a Cen-
tigrade temperature reading or vice versa is to enter the accompanying table in the center or boldface col-
umn of figures.
These figures refer to the temperature in either Fahrenheit or Centigrade degrees.
If it is desired to convert from Fahrenheit to Centigrade degrees, consider the center column as a table of
Fahrenheit temperatures and read the corresponding Centigrade temperature in the column at the left.
If it is desired to convert from Centigrade to Fahrenheit degrees, consider the center column as a table of
Centigrade values, and read the corresponding Fahrenheit temperature on the right.
1°C = 33.8°F
°C °F °C °F °C °F °C °F
–40.4
–37.2
–34.4
–31.7
–28.9
–28.3
–27.8
–27.2
–26.7
–26.1
–25.6
–25.0
–24.4
–23.9
–23.3
–22.8
–22.2
–21.7
–21.1
–20.6
–20.0
–19.4
–18.9
–18.3
–17.8
–17.2
–16.7
–16.1
–15.6
–15.0
–14.4
–13.9
–13.3
–12.8
–12.2
–40
–35
–30
–25
–20
–19
–18
–17
–16
–15
–14
–13
–12
–11
–10
–9
–8
–7
–6
–5
–4
–3
–2
–1
0
1
2
3
4
5
6
7
8
9
10
–40.0
–31.0
–22.0
–13.0
–4.0
–2.2
–0.4
1.4
3.2
5.0
6.8
8.6
10.4
12.2
14.0
15.8
17.6
19.4
21.2
23.0
24.8
26.6
28.4
30.2
32.0
33.8
35.6
37.4
39.2
41.0
42.8
44.6
46.4
48.2
50.0
–11.7
–11.1
–10.6
–10.0
–9.4
–8.9
–8.3
–7.8
–7.2
–6.7
–6.1
–5.6
–5.0
–4.4
–3.9
–3.3
–2.8
–2.2
–1.7
–1.1
–0.6
0
0.6
1.1
1.7
2.2
2.8
3.3
3.9
4.4
5.0
5.6
6.1
6.7
7.2
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
51.8
53.6
55.4
57.2
59.0
60.8
62.6
64.4
66.2
68.0
69.8
71.6
73.4
75.2
77.0
78.8
80.6
82.4
84.2
86.0
87.8
89.6
91.4
93.2
95.0
96.8
98.6
100.4
102.2
104.0
105.8
107.6
109.4
111.2
113.0
7.8
8.3
8.9
9.4
10.0
10.6
11.1
11.7
12.2
12.8
13.3
13.9
14.4
15.0
15.6
16.1
16.7
17.2
17.8
18.3
18.9
19.4
20.0
20.6
21.1
21.7
22.2
22.8
23.3
23.9
24.4
25.0
25.6
26.1
26.7
46
47
48
49
50
51
52
53
54
55
56
57
58
59
0
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
114.8
116.6
118.4
120.2
122.0
123.8
125.6
127.4
129.2
131.0
132.8
134.6
136.4
138.2
140.0
141.8
143.6
145.4
147.2
149.0
150.8
152.6
154.4
156.2
158.0
159.8
161.6
163.4
165.2
167.0
168.8
170.6
172.4
174.2
176.0
27.2
27.8
28.3
28.9
29.4
30.0
30.6
31.1
31.7
32.2
32.8
33.3
33.9
34.4
35.0
35.6
36.1
36.7
37.2
37.8
40.6
43.3
46.1
48.9
51.7
54.4
57.2
60.0
62.7
65.6
68.3
71.1
73.9
76.7
79.4
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
105
110
115
120
125
130
135
140
145
150
155
160
165
170
175
117.8
179.6
181.4
183.2
185.0
186.8
188.6
190.4
192.2
194.0
195.8
197.6
199.4
201.2
203.0
204.8
206.6
208.4
210.2
212.0
221.0
230.0
239.0
248.0
257.0
266.0
275.0
284.0
293.0
302.0
311.0
320.0
329.0
338.0
347.0

FOREWORD UNITS
00-22 04-05
UNITS
In this manual, the measuring units are indicated with Internatinal System of units (SI).
As for reference, conventionally used Gravitational System of units are indicated in parentheses { }.
Example:
N {kg}
Nm {kgm}
MPa {kg/cm2
}
kPa {mmH2O}
kPa {mmHg}
kW/rpm {HP/rpm}
g/kWh {g/HPh}

WA150-5 01-1
GENERAL ASSEMBLY DRAWINGS......................................... 01-2
SPECIFICATIONS..................................................................... 01-3
WEIGHT TABLE ........................................................................ 01-7
LIST OF LUBRICANT AND COOLANT..................................... 01-9
01 GENERAL

01-2 WA150-5
GENERAL GENERAL ASSEMBLY DRAWINGS
GENERAL ASSEMBLY DRAWINGS
Item Unit WA150-5
Operating weight (With BOC) kg 7,425
Rated load kN {kg} 23.5 {2,400}
Bucket capacity (piled) (With BOC) m3 1.5
Engine model — KOMATSU SAA4D102E-2 Diesel engine
Flywheel horse power kW {HP} / rpm 71 {96} / 2,000
A Overall length (With BOC) mm 6,320
B Overall height mm 3,035
C Overall height when bucket is raised mm 4,630
D Overall width mm 2,250
E Min. ground clearance mm 400
F Bucket width mm 2,390
G Dumping clearance Tip of bucket/Tip of BOC mm 2,765 / 2,705
H Dumping reach Tip of bucket/Tip of BOC mm 940/ 970
I Bucket dump angle deg. 45
Min. turning radius
Tip of bucket/Tip of BOC mm 5,165 / 5,185
Center of outside wheel mm 4,470
Travel speed
F1 km / h 4.6 – 13.0
F2 km / h 13.0
F3 km / h 20.0
F4 km / h 38.0
R1 km / h 4.6 – 13.0
R2 km / h 13.0
R3 km / h 20.0
R4 km / h 38.0

WA150-5 01-3
GENERAL
SPECIFICATIONS
Machine model WA150-5
Serial No. 65001 and up
Weight
Operating weight (With BOC) kg 7,425
Distribution (front) SAE travel posture kg 2,975
Distribution (rear) SAE travel posture kg 4,450
Performance
Bucket capacity (piled) (With BOC) m³ 1.5
Rated load kN {kg} 23.5 {2,400}
Travel speed FORWARD 1st km / h 4.6 – 13.0
FORWARD 2nd km / h 13.0
FORWARD 3rd km / h 20.0
FORWARD 4th km / h 38.0
REVERSE 1st km / h 4.6 – 13.0
REVERSE 2nd km / h 13.0
REVERSE 3rd km / h 20.0
REVERSE 4th km / h 38.0
Max. rimpull FORWARD kN {kg} 63.7 {6,500}
REVERSE kN {kg} 63.7 {6,500}
Gradeability deg. 25
Min. turning radius
(Center of outside
wheel) mm 4,470
Min. turning radius [SAE travel posture]
(Tip of bucket/Tip of BOC) mm 5,165 / 5,185
Dimensions
Overall length (with BOC) mm 6,320
Overall width (chassis) mm 2,250
Bucket width (with BOC) mm 2,390
Overall height (top of cab) mm 3,035
Overall height (Bucket approx. raised to
max.) mm 4,630
Wheel base mm 2,600
Tread mm 1,780
Min. ground clearance mm 400
Max. height of bucket hinge pin mm 3,485
Dumping clearance (Tip of bucket/Tip of BOC) mm 2,765 / 2,705
Dumping reach (Tip of bucket/Tip of BOC) mm 940 / 970
Steering angle deg. 40
Bucket tilt angle (travel posture) deg. 46
Bucket tilt angle (max. height) deg. 66
Bucket dump angle (max. height) deg. 46
Digging depth (10° dump)
(Tip of bucket/Tip of BOC) mm 220 / 255
SPECIFICATIONS

01-4 WA150-5
GENERAL
*1: Battery capacity (Ah) shows the rate of 5 hours.
Engine
Model SAA4D102E-2
Type 4-cycle, water-cooled, in-line, 4-cylinder,
direct injection with turbocharger, air-cooled after cooler
No. of cylinders - bore x stroke mm 4 – 102 x 120
Piston displacement l {cc} 3.92 {3,920}
Flywheel horsepower kW / rpm 71 / 2,000
{HP / rpm} {96 / 2,000}
Maximum torque Nm / rpm 402 / 1,300
{kgm / rpm} {41 / 1,300}
Min. fuel consumption ratio g / kWh {g / HPh} 219 {163}
High idle speed rpm 2,250
Low idle speed rpm 825
Starting motor 24 V 5.5 kW
Alternator 24 V 35 A
Battery (*1) 24 V 92 Ah x 2 pcs.
Powertrain
HST pump Variable displacement swash plate type piston pump
HST motor 1 Variable displacement bent axis type piston motor
HST motor 2 Variable displacement bent axis type piston motor
Transfer
Multiple shaft planetary compound-type, spur gear
constant mesh-type, 2 alternative power systems
Reduction gear Spiral bevel gear, splash lubrication type
Differential Straight bevel gear type, torque portioning
Final drive Planetary gear 1-stage, splash lubrication type
Axle
Drive type Front and rear wheel drive
Front axle Fixed to frame, semi-floating type
Rear axle Center pin support, semi-floating type
Tire
Tire size 16.9–24–10PR (L2)
Rim size W15L × 24
Inflation pressure Front tire kPa {kg / cm²} 235 {2.4}
Rear tire kPa {kg / cm²} 235 {2.4}
Brakes
Main brake
Braking system
4 wheel braking, Front and rear wheel independent sys-
tem control
Brake type Enclosed wet multiple disc type
Operation method Hydraulically controlled
Control method Hydraulic power servo assisted brake
Parking brake
Braking system Speed change gear output shaft braking
Brake type Wet multiple disc type
Operation method Mechanical type
Control method Hand lever type
SPECIFICATIONS
(5)

WA150-5 01-5
GENERAL
Steering
control
Type Articulated steering
Control Hydraulic control
Hydraulicsystem
Hydraulicpump
Work equipment and Steering pump
• Type Gear type
• Theoretical capacity cm³/rev 63.1
Brake and cooling fan pump
• Type Gear type
Transfer lubrication pump
• Type Gear type
Cylinder
Steeringcylinder
Type Reciprocating piston type
Cylinder inner diameter mm 55
Piston rod diameter mm 30
Stroke mm 375
Max. length between pins mm 1,020
Min. length between pins mm 645
Liftcylinder
Stroke mm 628
Min. length between pins mm 1,031
Bucketcylinder
Stroke mm 452
Min. length between pins mm 915
SPECIFICATIONS

01-6 WA150-5
GENERAL
Hydraulicsystem
Controlvalve
Work equipment control valve
• Type 2-spool type
• Set pressure MPa {kg / cm²} 20.6 {210}
Steering valve
• Type Orbit-roll type
• Set pressure MPa {kg / cm²} 18.6 {190}
Motor
Cooling fan motor
• Type Fixed displacement piston type
Work
equipment
Link type Single link
Bucket edge type Flat blade with top BOC
SPECIFICATIONS

WA150-5 01-7
GENERAL
WEIGHT TABLE
This weight table is a guide for use when transporting or handling components.
Unit: kg
Serial Numbers 65001 and up
Engine (without coolant and oil)
Cooling assembly (without coolant)
Cooling fan motor
Damper
450
71
6
3
HST pump
HST motor 1
HST motor 2
56
26
26
Transfer
Front drive shaft
Rear drive shaft
Front axle
Rear axle
Axle pivot (rear axle)
158
14
4
410
380
66
Wheel (each)
Tire (each)
Orbit-roll valve
Priority valve
Steering cylinder assembly (each)
Brake valve
53
91
7
6
13
10
Hydraulic tank (without hydraulic oil)
3-gear pump unit
Work equipment PPC valve
Work equipment control valve
Lift cylinder assembly (each)
Bucket cylinder assembly
Engine hood (with side panel)
Front frame
Rear frame
59
20
3
19
64
50
140
593
573
WEIGHT TABLE

01-8 WA150-5
GENERAL
Unit: kg
Serial Numbers 65001 and up
Lift arm (including bushing)
Bucket (1.5m3, including BOC)
Bell crank
Bucket link
Counterweight
Additional counterweight (1 piece)
Fuel tank (without fuel)
Battery (each)
Operator’s Cab (including air conditioner and interior parts)
Operator’s seat
447
595
108
17
660
100
70
33
755
41
WEIGHT TABLE
(5)

WA150-5 01-9
GENERAL
LIST OF LUBRICANT AND COOLANT
For details of the notes (Note 1, Note 2, ---) in the table, see the Operation and Maintenance Manual.
Reservoir Engine oil
pan
Transfer
case
Hydraulic
system
Axle
Fuel tank
Cooling
systemCapacity Front Rear
Specified
Liters 14 4.8 90 14.0 14.5 133 17
US gal 3.70 1.27 23.78 3.70 3.83 35.14 4.49
Refill
Liters 12.5 4.4 47 14.0 14.5 – –
US gal 3.30 1.16 12.42 3.70 3.83 – –
(5)
LIST OF LUBRICANT AND COOLANT

WA150-5 10-1
ENGINE MOUNT AND TRANSFER MOUNT 10- 2
DAMPER........................................................ 10- 3
COOLING SYSTEM....................................... 10- 4
POWER TRAIN.............................................. 10- 5
POWER TRAIN SYSTEM DIAGRAM ............ 10- 6
DRIVE SHAFT (PROPELLER SHAFT) ......... 10- 8
HST HYDRAULIC PIPING DIAGRAM ........... 10- 9
HST PUMP .................................................... 10-10
HIGH-PRESSURE RELIEF VALVE............... 10-12
LOW-PRESSURE RELIEF VALVE................ 10-14
HST CHARGE PUMP .................................... 10-15
SPEED-RELATED VALVE (DA VALVE) ....... 10-16
HIGH-PRESSURE CUT-OFF VALVE............ 10-17
HST MOTOR ................................................. 10-18
EP SERVO VALVE ........................................ 10-21
HA SERVO VALVE........................................ 10-22
FORWARD-REVERSE SHUTTLE VALVE .... 10-23
TRANSFER.................................................... 10-24
CLUTCH SOLENOID VALVE ........................ 10-35
AXLE.............................................................. 10-36
DIFFERENTIAL ............................................. 10-38
LIMITED-SLIP DIFFERENTIAL ..................... 10-44
FINAL DRIVE................................................. 10-48
AXLE MOUNTING AND
CENTER HINGE PIN .............................. 10-50
STEERING PIPING ....................................... 10-55
STEERING COLUMN .................................... 10-56
PRIORITY VALVE ......................................... 10-57
ORBIT-ROLL VALVE..................................... 10-60
STEERING CYLINDER ................................. 10-68
EMERGENCY STEERING PIPING ............... 10-70
EMERGENCY STEERING VALVE................ 10-71
BRAKE PIPING.............................................. 10-74
BRAKE VALVE .............................................. 10-75
INCHING VALVE ........................................... 10-79
CHARGE VALVE ........................................... 10-80
ACCUMULATOR (FOR BRAKE) ................... 10-84
SLACK ADJUSTER ....................................... 10-85
BRAKE........................................................... 10-88
PARKING BRAKE CONTROL ....................... 10-91
PARKING BRAKE.......................................... 10-92
HYDRAULIC PIPING ..................................... 10-94
WORK EQUIPMENT LEVER LINKAGE ........ 10-96
HYDRAULIC TANK........................................ 10-97
3-GEAR PUMP UNIT....................................10-100
ACCUMULATOR (FOR PPC CIRCUIT).......10-102
LOCK VALVE ...............................................10-103
E.C.S.S. VALVE ...........................................10-104
ACCUMULATOR (FOR E.C.S.S.) ................10-107
HYDRAULIC PIPING OF
COOLING SYSTEM...............................10-108
COOLING FAN MOTOR...............................10-109
WORK EQUIPMENT CONTROL VALVE.....10-110
WORK EQUIPMENT PPC VALVE ...............10-123
WORK EQUIPMENT LINKAGE....................10-130
BUCKET .......................................................10-132
BUCKET POSITIONER AND
BOOM KICK-OUT..................................10-133
WORK EQUIPMENT CYLINDER.................10-139
AIR CONDITIONER......................................10-140
MACHINE MONITORING SYSTEM.............10-141
MACHINE MONITOR ...................................10-151
LIST OF ITEMS DISPLAYED
ON MONITOR........................................10-152
ELECTRICAL SYSTEM
(HST CONTROLLER SYSTEM) ............10-178
HST CONTROLLER.....................................10-182
ENGINE START CIRCUIT............................10-183
ENGINE STOP CIRCUIT..............................10-185
PREHEATING CIRCUIT...............................10-186
PARKING BRAKE CIRCUIT.........................10-187
ELECTRONICALLY CONTROLLED
SUSPENSION SYSTEM........................10-190
SENSORS ....................................................10-191
10 STRUCTURE, FUNCTION AND
MAINTENANCE STANDARD

10-2 WA150-5
STRUCTURE, FUNCTION AND MAINTENANCE STANDARD
ENGINE MOUNT AND TRANSFER MOUNT
ENGINE MOUNT AND TRANSFER MOUNT

WA150-5 10-3
DAMPER
Unit: mm
3. Flange
4. HST pump input shaft
5. Hub
6. Cover
7. Flywheel
8. Insert
Outline
• The damper reduces the torsional vibration
caused by fluctuation of the engine torque to pro-
tect the drive system after the engine from the
torsional vibration.
• The power from the engine is transmitted through
flywheel (7) to flange (3), which absorbs the tor-
sional vibration, and then transmitted through
hub (5) to the HST pump.
No. Check item Criteria Remedy
1
Distance between HST pump
mounting face and end of hub
Standard size Repair limit
Adjust
61.2 ± 0.8
2 Wear of flange and insert Repair limit: 1.0 Replace
DAMPER

10-4 WA150-5
COOLING SYSTEM
1. Oil cooler
2. After cooler
3. Radiator
4. Reservoir tank
5. Cooling fan
6. Cooling fan motor
Specification
Radiator Oil cooler After cooler
Core type AL WAVE–4 CF40–1 AL WAVE
Fin pitch (mm) 3.5 / 2 3.5 / 2 4.0 / 2
Total heat radiating area (m2) 22.0 5.72 5.75
Pressure valve opening pressure
(kPa {kg/cm2
})
68.6
{0.7}
— —
Vacuum valve opening pressure
(kPa {kg/cm2
})
0 – 4.9
{0 – 0.05}
— —
COOLING SYSTEM

WA150-5 10-5
POWER TRAIN
1. Engine
2. Damper
3. HST pump
4. 3-gear pump unit
5. High-pressure hose
6. HST motor 1
7. HST motor 2
8. Transfer
9. Front drive shaft
10. Front axle
11. Rear drive shaft
12. Rear axle
POWER TRAIN

10-6 WA150-5
POWER TRAIN SYSTEM DIAGRAM

WA150-5 10-7
1. Engine
2. Damper
3. HST pump
4. Work equipment and Steering pump
5. Brake and cooling fan pump
6. Transfer lubricating oil pump
7. High-pressure hose
8. HST motor 1
9. HST motor 2
10. Emergency steering valve (If equipped)
11. Transfer
12. Transfer clutch
13. Parking brake
15. Front axle
16. Differential
17. Wet multiple disc brake
18. Final drive
19. Front tire
20. Rear drive shaft
21. Rear axle
22. Differential
23. Wet multiple disc brake
24. Final drive
25. Rear tire
Outline
• The power of engine (1) is transmitted to HST
pump (3) through damper (2) which is installed to
the flywheel and which absorbs the torsional vi-
bration of the power,
• The power of engine (1) is also transmitted to
HST pump (3), HST charge pump built in HST
pump (3), work equipment and steering pump (4)
connected to HST pump (3), brake and cooling
fan pump (5), and transfer lubricating oil pump
(6).
• HST pump (3) is equipped with the forward-re-
verse shifting valve and servo piston, which
changes the discharge direction and discharge
rate of HST pump (3) continuously by changing
the swash plate angle.
• HST motors (8) and (9) are installed to transfer
(11) and connected to HST pump (3) by high-
pressure hose (7).
• The turning direction and speed of HST motors
(8) and (9) are changed by the hydraulic power of
HST pump (3) to control the travel direction and
travel speed of the machine.
• The power of HST motor 1 (8) is transmitted
through transfer clutch (12) in transfer (11) to the
output shaft.
The power of HST motor 2 (9) is transmitted
through the gear in transfer (11) to the output
shaft.
• Parking brake (13) is installed on the rear side in
transfer (11). It operates the wet multiple disc
brake to stop the machine according to the oper-
ation of the parking brake lever.
• The power for the front side is transmitted
through front drive shaft (14) to front axle (15).
The power for the rear side is transmitted
through rear drive shaft (20) to rear axle (21).
• The power transmitted to axles (15) and (21) is
reduced in speed by the pinion gears of differen-
tials (16) and (22), and then transmitted through
the sun gear shaft to the sun gear.
• The power of the sun gear is reduced in speed by
the planetary mechanisms of final drives (18) and
(24), and then transmitted through the axle shaft
and wheels to tires (19) and (25).

10-8 WA150-5
DRIVE SHAFT
1. Front axle
3. Transfer
4. Rear drive shaft
5. Rear axle
Outline
• The power from the output shaft of the transfer is
transmitted through front drive shaft (2) and rear
drive shaft (4) to front axle (1) and rear axle (5).
• When the machine is articulated or it receives an
impact from the road during travel or a working
impact, the positions of the transfer and front and
rear axles change. The drive shafts can change
their angles and lengths by means of the univer-
sal joints and sliding joints so that the power will
be transmitted without damaging any part even
when the positions of the components change
because of the impacts.
DRIVE SHAFT

WA150-5 10-9
HST HYDRAULIC PIPING DIAGRAM
1. Hydraulic tank
2. HST pump
3. Clutch solenoid valve
4. HST oil filter
5. HST motor 1
6. HST motor 2
HST HYDRAULIC PIPING DIAGRAM

10-10 WA150-5
HST PUMP
a HST: Abbreviation for Hydro Static Transmission
1. Forward-reverse shifting solenoid valve
2. High-pressure cut-off valve
3. Speed-related valve (DA valve)
4. Charge pump
5. Low-pressure relief valve
6. Servo cylinder
7. High-pressure relief valve
8. Control plate
9. Cylinder block
10. Piston
11. Swash plate
Specifications
Model A4VG71DA
Type
Variable displacement swash
plate-type piston pump
Theoretical capacity
(cc / rev)
0 – 71
Set pressure of high-pressure
relief valve (MPa {kg/cm2
})
43.2 {441}
cut-off valve (MPa {kg/cm2
})
Effective differential pressure
40.2 {410}
Set pressure of low-pressure
})
2.5 {25}
HST PUMP

WA150-5 10-11
Operation
Flow of power
• The HST pump is installed to the coupling which
is installed to the engine flywheel.
• The power of the engine is transmitted from the
flywheel through the coupling to the HST pump.
• The HST pump is equipped with forward-reverse
shifting solenoid valve (1) and servo cylinder (6).
If the operator operates for forward or reverse
travel, forward-reverse shifting solenoid valve (1)
operates and swash plate (11) in the HST pump
slants to reverse the oil flow.
• Cylinder block (9) and pistons (10) in it rotate to-
gether with drive shaft (12) and the tips of pistons
(10) slide on swash plate (11) which does not ro-
tate. The pump has 9 pistons (10) in it.
Flow of oil
• As swash plate (11) of the HST pump slants, pis-
tons (10) in contact with its surface reciprocate
and work as pumps to suck and discharge the oil
in cylinder block (9).
• As a result, high-pressure oil flows in a constant
direction into the HST motor.
• If swash plate (11) slants in the opposite direc-
tion, the sucking and discharging directions of the
oil are reversed, that is, the oil flows in the oppo-
site direction. While swash plate (11) is in neu-
tral, pistons (10) do not reciprocate, thus they do
not discharge any oil.
• The strokes of pistons (10) are changed to con-
trol the travel speed by increasing or decreasing
inclination (angle) of swash plate (11).
• If the quantity of the oil in the low-pressure circuit
(the return circuit from the motor to the pump) be-
comes insufficient because of leakage from the
HST pump, HST motor, and control valve, the
charge pump adds oil through speed-related
valve (3) and check valve of high-pressure relief
valve (7).
HST PUMP

10-12 WA150-5
HIGH-PRESSURE RELIEF VALVE
1. Nut
2. Locknut
3. Poppet spring
4. Check spring
5. Main piston
6. Valve seat
7. Pilot poppet
8. Adjustment screw
Function
• The high-pressure relief valve is installed to the
HST pump. If the oil pressure in the high-pres-
sure circuit between the HST pump and HST mo-
tor rises higher than the set pressure, the high-
pressure relief valve drains the oil into the low-
pressure circuit.
The high-pressure relief valve controls the maxi-
mum pressure in the circuit to protect the circuit
with this function.
• If the quantity of the oil in the circuit becomes in-
sufficient, the high-pressure valve leads oil in
from the HST charge pump to prevent cavitation.

WA150-5 10-13
Operation
• Port A is connected to the high-pressure circuit of
the HST pump and ports C and D are connected
to the low-pressure circuit of the HST pump.
The oil fills chamber B through the orifice of main
piston (5).
Pilot poppet (7) is seated on valve seat (6).
• If the oil pressure in port A and chamber B reach-
es the set pressure of poppet spring (3), pilot
poppet (7) opens and the oil in chamber B flows
through chamber D to port C, and the oil pressure
in chamber B lowers consequently.
If the oil pressure in chamber B lowers, a pres-
sure difference is made between port A and
chamber B by the orifice of main piston (5). As a
result, main piston (5) is pushed open and the oil
in port A flows into port C to relieve the abnormal
pressure.
• The set pressure can be adjusted by increasing
or decreasing the tension of poppet spring (3).
To adjust the set pressure, remove the nut and
loosen the locknut. If the adjustment screw is
tightened, the set pressure is heightened. If the
former is loosened, the latter is lowered.
• If the oil pressure in port A lowers below that in
port C, check spring (4) pushes back main piston
(5) and the oil in port C flows through chamber D
into port A so that the quantity of the oil in port A
will not become insufficient.

10-14 WA150-5
LOW-PRESSURE RELIEF VALVE
1. Locknut
2. Adjustment screw
3. Piston
4. Spring
Function
• The low-pressure relief valve is installed to the
HST pump. If the oil pressure in the low-pressure
circuit between the HST pump and HST motor
rises higher than the set pressure, the low-pres-
sure relief valve drains the oil into the hydraulic
tank.
The low-pressure relief valve controls the pres-
sure in the HST pump charge circuit to protect the
circuit with this function.
Operation
• Port A is connected to the HST pump charge cir-
cuit and port B is connected to the drain circuit.
If the oil pressure is below the set pressure, the
oil does not flow into port B.
• If the pressure in port A reaches the set pressure
for some reason, piston (3) opens and the oil in
port A flows into port B, and the oil pressure in
port A lowers consequently.
• The set pressure can be adjusted by increasing
or decreasing the tension of spring (4).
To adjust the set pressure, loosen locknut (1) and
turn adjustment screw (2). If the adjustment
screw is tightened, the set pressure is height-
ened. If the former is loosened, the latter is low-
ered.
LOW-PRESSURE RELIEF VALVE

WA150-5 10-15
HST CHARGE PUMP
1. Cover bolt
2. Pump gear
3. Key
4. Coupling
5. Drive shaft
6. Plate
7. Charge pump cover
8. Crescent divider board
Outline
• The HST charge pump is built in the HST pump
and driven together with the HST pump to supply
oil to the HST speed-related valve and low-pres-
sure relief valve of the HST pump.
• The HST charge pump sucks in oil from the hy-
draulic tank.
Specifications
Function
• The HST charge pump is connected to drive shaft
(5) of the HST pump and rotated by coupling (4).
• The HST charge pump has pump gear (2) and
crescent divider board (8) in it and sucks and dis-
charges the oil in the direction shown in the
above figure.
Type
Gear pump
(Inscribed type)
Theoretical capacity
(cc/rev)
19.6
HST CHARGE PUMP

10-16 WA150-5
SPEED-RELATED VALVE (DA VALVE)
1. Locknut
2. Adjustment screw
3. Poppet spring
4. Spring seat
5. Pilot poppet
Function
• The speed-related valve is installed to the HST
pump and used to divide the oil from the HST
charge pump into two parts. One part flows
through a throttle valve to the forward-reverse
shifting solenoid valve of the HST pump and the
other part flows to the low-pressure relief valve of
the HST pump.
Operation
• Port A is connected to the HST pump charge cir-
cuit. Port D is connected to the low-pressure re-
lief valve circuit. Port C is connected to the
forward-reverse shifting solenoid valve circuit.
• The oil from the HST charge pump always flow
through the throttle valve of pilot poppet (5),
chamber B, and port D to the low-pressure relief
valve.
As the hydraulic pressure from the HST charge
pump is applied a differential pressure is gener-
ated between port A and chamber B because of
the throttle valve of pilot poppet (5). Since this dif-
ferential pressure moves pilot poppet (5), the oil
flows from chamber B through port C to the for-
ward-reverse shifting solenoid valve.
• Pilot poppet (5), poppet spring (3), and spring
seat (4) are used as a set. To change the set
pressure, loosen locknut (1) and turn the adjust-
ment screw (2). If the adjustment screw is tight-
ened, the set pressure is lowered. If the former is
loosened, the latter is heightened.
SPEED-RELATED VALVE (DA VALVE)

WA150-5 10-17
HIGH-PRESSURE CUT-OFF VALVE
1. Adjustment screw
2. Locknut
3. Spring
4. Spool
5. Piston
6. Barrel
7. Shuttle spool
8. Valve seat
Function
• The high-pressure cut-off valve is installed to the
HST pump. If the oil pressure in the high-pres-
sure circuit between the HST pump and HST mo-
tor rises higher than the set pressure, the high-
pressure cut-off valve drains the oil from the ser-
vo cylinder circuit into the hydraulic tank to con-
trol the maximum pressure in the HST pump
circuit.
Operation
• Port A is connected to the high-pressure circuit
during reverse travel. Port B is connected to the
high-pressure circuit during forward travel. Port
Pc is connected to the speed-related valve, and
port T is connected to the drain circuit.
• If the pressure on the port A side rises high for
some reason, shuttle spool (7) is pushed down
and the circuit on port B side is closed. At the
same time, piston (5) is pushed up by the hydrau-
lic pressure on port A side and spring (3) is com-
pressed and spool (4) is also pushed up. Then,
ports Pc and T are opened and the hydraulic oil
in the speed-related valve circuit flows into the
drain port.
As a result, the oil pressure in port Pc lowers and
the swash plate angle of the HST pump reduces,
and consequently the discharge reduces and the
abnormal pressure in the HST pump circuit low-
ers.
HIGH-PRESSURE CUT-OFF VALVE

10-18 WA150-5
HST MOTOR
a HST: Abbreviation for Hydro Static Transmission
HST motor 1
1. Drive shaft
2. Piston
3. Cylinder block
4. Port plate
5. EP servo valve
Specifications
Model A6VM55EP
Type
Variable displacement bent
axis type piston motor
Theoretical capacity (cc/rev) 0 – 55
})
43.2 {441}
cut-off valve (MPa {kg/cm2
})
40.2 {410}
})
2.5 {25}
HST MOTOR
(5)

WA150-5 10-19
HST motor 2
1. Drive shaft
2. Piston
3. Cylinder block
4. Port plate
5. HA servo valve
6. Forward-reverse shuttle valve
Specifications
Model A6VM55HA
Type
Variable displacement bent
axis type piston motor
Theoretical capacity (cc/rev) 28.5 – 55
relief valve (MPa {kg/cm2})
43.2 {441}
cut-off valve (MPa {kg/cm2})
40.2 {410}
relief valve (MPa {kg/cm2})
2.5 {25}
HST MOTOR
(5)

10-20 WA150-5
Principle
• Let's assume that a shaft of a disc is supported
and the disc can rotate freely. If force F is applied
bias to this disc, it is divided into component force
F1 at right angles to the disc and component
force F2 in the peripheral direction of the disc.
Component force F2 rotates the disc to the right.
• If force F', not force F, is applied to the disc, it is
divided into component forces F1' and F2' simi-
larly to the above and force F2' rotates the disc to
the left
Structure
• There are 7 pistons (2) installed to the disc por-
tion of the drive shaft (1) as if they are spherical
joints. They are set in cylinder block (3) at a cer-
tain angle to drive shaft (1).
• As the external load on the HST motor is in-
creased by servo valve (5) and forward-reverse
shuttle valve (6), inclination of pistons (2) is in-
creased. As a result, the revolving speed is low-
ered but the torque is increased.
Operation
• The hydraulic oil sent from the HST pump flows
in the inlet port of the HST motor and gives hy-
draulic pressure to the back side of pistons (2).
Accordingly, drive shaft (1) rotates because of in-
clination of pistons (2) and cylinder block (3).
• The oil from the HST pump flows between the for-
ward-reverse shifting solenoid valve and servo
cylinder into forward-reverse shuttle valve (6) of
the HST motor. The oil from the forward or re-
verse high-pressure discharge side of the HST
motor flows into forward-reverse shuttle valve
(6). If a load is applied to the motor connected to
servo valve (5) in the HST motor, the oil flows into
the servo cylinder of the HST motor because of
the pressure difference from forward-reverse
shuttle valve (6) side, thus cylinder block (3) is in-
clined more.
HST MOTOR

WA150-5 10-21
EP SERVO VALVE
1. Motor 1 solenoid valve
2. EP servo valve
3. Spring
4. Servo cylinder
Function
• The EP servo valve is installed to the rear part of
HST motor 1 and used to change the displace-
ment of the motor according to the current given
to motor 1 solenoid valve (1).
Operation
• Suction force F1 of motor 1 solenoid valve (1)
and force F2 of spring (3) are applied to EP servo
valve (2).
• If the current given to motor 1 solenoid valve (1)
is little (F1 < F2), EP servo valve (2) leads the hy-
draulic pressure of the motor high-pressure cir-
cuit to the small diameter (S) side of servo
cylinder (4) and releases the hydraulic pressure
on the large diameter (L) side into the tank (motor
housing). As a result, servo cylinder (4) moves
toward the min side.
• If the current given to motor 1 solenoid valve (1)
is large (F1 > F2), EP servo valve (2) leads the
hydraulic pressure to the large diameter (L) side.
As a result, servo cylinder (4) moves toward the
max side because of the area difference between
the small diameter (S) side and large diameter (L)
side.
• The force of spring (3) changes according to the
position of servo cylinder (4) (the displacement of
the motor).
Accordingly, the displacement of the motor is
controlled by the current given to motor 1 sole-
noid valve (1) so that suction force F1 will be bal-
anced with spring force F2.
EP SERVO VALVE

10-22 WA150-5
HA SERVO VALVE
1. Motor 2 solenoid valve
2. HA servo valve
3. Servo cylinder
Function
• The HA servo valve is installed to the rear part of
HST motor 2 and used to control the position of
servo cylinder (3) (the displacement of the motor)
to meet the motor output to the external load on
the motor. The displacement is controlled with
the hydraulic pressure in the circuit selected by
the forward-reverse shuttle valve.
Operation
• When the load on the machine is small, HA servo
valve (2) leads the hydraulic pressure on the side
selected by the forward-reverse shuttle valve to
the small diameter (S) side of servo cylinder (3)
and releases the hydraulic pressure on the large
diameter (L) side into the tank (motor housing) to
minimize the displacement of the motor.
• When a large load is applied to the machine on a
uphill, etc., HA servo valve (2) leads the hydraulic
pressure to the large diameter (L) side. As a re-
sult, servo cylinder (3) moves toward the max
side because of the area difference between the
small diameter (S) side and large diameter (L)
side. At this time, the displacement of the motor
becomes largest and the motor generates large
torque.
• If motor 2 solenoid valve (1) is energized, HA ser-
vo valve (2) leads the hydraulic pressure to the
large diameter (L) side and the displacement of
the motor becomes largest, regardless of the
load on the machine.
HA SERVO VALVE

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KOMATSU WA150-5 WHEEL LOADER Service Repair Manual SN：65001 and up

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KOMATSU WA150-5 WHEEL LOADER Service Repair Manual SN：65001 and up