Komatsu Galeo PC800-8 Shop Manual page 747

40 Troubleshooting
Failure • The machine push-up function does not oper-
phenomenon ate normally.
Relative
• When the machine push-up function is set in the low pressure position, the solenoid is turned ON.
information
1 Defective fuse No. 2
Defective machine
2 push-up switch
(Internal disconnection)
Defective machine
push-up solenoid
3 (Internal disconnection,
short-circuiting or ground-
ing fault)
Possible causes
Defective assembled-type
and standard 4 diode D03
value in normal
(Internal short-circuiting)
state
Disconnection of wiring
harness
5
(Disconnection or defec-
tive contact with connector)
Grounding fault of wiring
harness
6
(Contact with grounding cir-
cuit)
PC800, 850-8
Cause Standard value in normalcy and references for troubleshooting
If the fuse is broken, the circuit probably has grounding fault (See cause
6).
aTurn the engine starting switch OFF for the preparations, and hold it in
the OFF position during the troubleshooting.
S05 (female)
Between (1) – (2)
aTurn the engine starting switch OFF for the preparations, and hold it in
the OFF position during the troubleshooting.
Between (1) – chassis ground
aTurn the engine starting switch OFF for the preparations, and hold it in
the OFF position during troubleshooting.
aTurn the engine starting switch OFF for the preparations, and hold it in
the OFF position during the troubleshooting.
Wiring harness between FB1-2 outlet – S05
(male) (1)
Wiring harness between S05 (male) (2) – J01 –
V06 (female) (2)
Wiring harness between V06 (female) (1) – J20 –
J19 – J25 – chassis ground
aTurn the engine starting switch OFF for the preparations, and hold it in
the OFF position during the troubleshooting.
Wiring harness between FB1-2 outlet – S05
(male) (1) or between FB1-2 outlet – related cir-
cuits and chassis ground
Wiring harness between S05 (male) (2) – J01 –
V06 (female) (2) or between S05 (male) (2) –
D03 (female) (1) and chassis ground
(2) The machine push-up function is not turned OFF.
Machine push-up
switch
Low pressure position
High pressure position
V06 (male)
Between (2) – (1)
D03 (male)
Between (1) – (5)
SEN00793-02
Resistance
Max. 1 z
Min. 1 Mz
Resistance
20 – 60 z
Min. 1 Mz
Resistance (Continuitiy)
Min. 1 Mz (No continuitiy)
Resis-
Max. 1 z
tance
Resis-
Max. 1 z
tance
Resis-
Max. 1 z
tance
Resis-
Min. 1 Mz
tance
Resis-
Min. 1 Mz
tance
21