Komatsu ecot3 WA500-6 Install guide

WHEEL LOADER
SEN05647-00
WA500 -6
SERIAL NUMBERS 55739 and up
Stone Handling Spec.

WA500-6
WHEEL LOADER
1SHOP MANUAL
WA500-6
Machine model Serial number
WA500-6 55739 and up
00 Index and foreword 1
00-1

Table of contents
2
WA500-6
Table of contents 1
00 Index and foreword
Table of contents...............................................................................................................................00- 2
Table of contents...................................................................................................................... 00- 2
Foreword...........................................................................................................................................00- 3
Before reading this manual...................................................................................................... 00- 3
10 Structure, function and maintenance standard
Hydraulic system...............................................................................................................................10- 4
Control valve............................................................................................................................ 10- 4
20 Standard value table
Standard service value table.............................................................................................................20- 3
Standard service value table for chassis ................................................................................. 20- 3
90 Diagrams and drawings
90 Diagrams and drawings ...............................................................................................................90- 3
Work equipment hydraulic circuit diagram ............................................................................... 90- 3
00-2

Foreword
Before reading this manual
WA500-6
3
Foreword 1
Before reading this manual 1
qThis shop manual describes only the different part from the standard machine (WA500-6: S/N 55001
and up).
qFor the component that is not described in this manual, refer the shop manual for the standard machine
(WA500-6: S/N 55001 and up).
00-3

Foreword
Before reading this manual
4
WA500-600-4

WA500-6
WHEEL LOADER
1SHOP MANUAL
WA500-6
Machine model Serial number
WA500-6 55739 and up
10 Structure, function and
maintenance standard 1
10-1

Contents
2
WA500-6
Contents 1
10 Structure, function and maintenance standard
Hydraulic system.................................................................................................................................. 10- 4
Control valve .................................................................................................................................... 10- 4
10-2

Contents
WA500-6
3
10-3

Hydraulic system
Control valve
4
WA500-6
Hydraulic system 1
Control valve 1
Outline
A1: To bucket cylinder bottom
A2: To lift arm cylinder bottom
A3: To lift arm cylinder bottom
B1: To bucket cylinder head
B2: To lift arm cylinder head
B3: To bucket cylinder head
CP: Pressure sensor installation port
P1: From front work equipment hydraulic pump
P2: From rear work equipment hydraulic pump
PA1: From bucket dump controller
PA2: From lift arm raise controller
PB1: From bucket tilt controller
PB2: From lift arm lower controller
PLS: To work equipment hydraulic pump LS port
PP: From pilot pump
PPS: To work equipment hydraulic pump
T: To tank
TS: To tank
1. Bucket valve
2. Lift arm valve
3. Lift arm Hi and bucket Hi valves
4. Cover 1
5. Cover 2
6. Lift arm suction valve
10-4

Hydraulic system
Control valve
WA500-6
5
Outside view
10-5

Hydraulic system
Control valve
6
WA500-6
Sectional view
(1/6)
10-6

Hydraulic system
Control valve
WA500-6
7
1. Load check valve (Bucket bottom)
2. Load check valve (Lift arm bottom)
3. Load check valve (Lift arm Hi) and (Lift arm bottom)
4. Load check valve (Bucket Hi) and (Bucket head)
5. Pressure compensation valve (Lift arm head)
6. Load check valve (Bucket head)
Unit: mm
No. Check item Criteria Remedy
7 Check valve spring
Standard size Repair limit
If damaged or
deformed,
replace spring
Free length
x Outside
diameter
Installed
length
Installed
load
Free
length
Installed
load
38.9 x 11.5 30.0 29.4 N
{3.0 kg} —23.5 N {2.4 kg}
10-7

Hydraulic system
Control valve
8
WA500-6
(2/6)
10-8

Hydraulic system
Control valve
WA500-6
9
1. Spool (Lift arm Hi)
2. Spool (Bucket Hi)
3. Spool (Lift arm)
4. Spool (Bucket)
Unit: mm
No. Check item Criteria Remedy
5 Spool return spring
Standard size Repair limit
If damaged or
deformed,
replace spring
Free length
x Outside
diameter
Installed
length
Installed
load
Free
length
Installed
load
54.5 x 34.8 53.5 121 N
{12.3 kg} —96.1 N {9.8 kg}
6 Spool return spring 54.2 x 34.8 53.5 94.1 N
{9.6 kg} —77.5 N {7.7 kg}
7 Spool return spring 51.6 x 33.0 47.0 245 N
{25.0 kg} —196 N {20.0 kg}
8 Spool return spring 54.9 x 24.2 54.5 33.4 N
{3.4 kg} —26.5 N {2.7 kg}
9 Spool return spring 66.9 x 36.1 65.5 108 N
{11.0 kg} —86.3 N {8.8 kg}
10 Spool return spring 53.2 x 22.3 33.0 274 N
{27.9 kg} —219 N {22.3 kg}
10-9

Hydraulic system
Control valve
10
WA500-6
(3/6)
10-10

Hydraulic system
Control valve
WA500-6
11
1. Suction safety valve (Bucket bottom)
2. Suction valve (Lift arm Hi)
3. Suction valve (Bucket Hi)
4. Suction safety valve (Lift arm head)
5. Suction safety valve (Bucket head)
6. Suction safety valve (Lift arm bottom)
Unit: mm
No. Check item Criteria Remedy
7Suction valve spring
Standard size Repair limit
If damaged or
deformed,
replace spring
Free length
x Outside
diameter
Installed
length
Installed
load
Free
length
Installed
load
46.8 x 7.5 40.6 5.5 N
{0.56 kg} —4.4 N {0.45 kg}
10-11

Hydraulic system
Control valve
12
WA500-6
(4/6)
10-12

Hydraulic system
Control valve
WA500-6
13
1. Unload valve
Bucket valve
2. EPC valve (Dump)
3. Load check valve (Dump)
4. Load check valve (Tilt)
5. EPC valve (Tilt)
6. Suction safety valve (Tilt)
7. Spool
8. Suction safety valve (Dump)
10-13

Hydraulic system
Control valve
14
WA500-6
(5/6)
10-14

Hydraulic system
Control valve
WA500-6
15
Lift arm valve
1. EPC valve (Lower and float)
2. Load check valve (Lift)
3. LS shuttle valve
4. Pressure compensation valve (Lower)
5. EPC valve (Raise)
6. Suction safety valve (Lower and float)
7. Suction valve (Lower and float)
8. Spool
9. Suction safety valve (Lift)
Unit: mm
No. Check item Criteria Remedy
10 Suction valve spring
Standard size Repair limit
If damaged or
deformed,
replace spring
Free length
x Outside
diameter
Installed
length
Installed
load
Free
length
Installed
load
62.5 x 20.0 34.9 3.53 N
{0.36 kg} —2.84 N {0.29 kg}
10-15