Komatsu Galeo PC800-8 Shop Manual page 749

40 Troubleshooting
Failure • The boom shockless function does not oper-
phenomenon ate normally.
Relative
• When the boom shockless function is turned OFF, the solenoid is turned ON.
information
1 Defective fuse No. 2
Defective boom
2 shockless control switch
(Internal disconnection)
Defective boom
shockless solenoid
3
(Internal disconnection or
short-circuiting)
Defective assembled-type
Possible causes 4 diode D04
and standard
(Internal short-circuiting)
value in normal
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.
S06 (female)
Between (2) – (3)
aTurn the engine starting switch OFF for the preparations, and hold it in
the OFF position during the troubleshooting.
V09 (male), V10 (male)
Between (1) – chassis ground
aTurn the engine starting switch OFF for the preparations, and hold it in
the OFF position during the 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 – S06
(male) (2)
Wiring harness between S06 (male) (3) – V09
(female) (2) or between S06 (male) (3) – V10
(female) (2).
Wiring harness between V09 (female) (1), V10
(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 – S06
(female) (2) or between FB1-2 outlet – related
circuits and chassis ground
Wiring harness between S06 (male) (3) – V09
(female) (2) and V10 (female) (2) or between
S06 (male) (3) – D04 (female) (1) and chassis
ground
(2) The boom shockless function is not turned OFF.
Boom shockless
control switch
OFF
ON
Between (2) – (1)
D04 (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
23