Work Equipment, Swing, And Travel System Do Not Operate - Komatsu PC130-7 Shop Manual

TROUBLESHOOTING
E-8 Work equipment, swing, and travel system do not operate
Trouble

• Work equipment, swing, and travel system do not operate

Related
information
1 Defective fuse No. 3
Defective safety lock switch
2
(Internal disconnection)
Defective PPC lock
solenoid
3
(Internal disconnection or
short circuit)
Defective assembled-type
4 diode D01
Possible causes
(Internal short circuit)
and standard
value in normal
state
Disconnection in wiring
harness
5 (Disconnection in wiring
harness or defective
contact in connector)
Short circuit with chassis
ground in wiring harness
6
(Contact with ground
circuit)
20-418
(1)
Cause Standard value in normal state/Remarks on troubleshooting
If the fuse is broken, the circuit probably has a grounding fault, etc.
(See cause 6.)
aPrepare with starting switch OFF.
S14 (female)
Between (1) and (2)
aPrepare with starting switch OFF.
Between (1) and chassis ground
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch.
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch.
Wiring harness between FB1-3 outlet and S14
(male) (1)
Wiring harness between S14 (male) (2) and
J02 and V01 (female) (1)
Wiring harness between V01 (female) (2) and
chassis ground
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch.
Between FB1-3 outlet – S14 (male) (1) wiring
harness and chassis ground
Between S14 (male) (2) – J02 – V01 (female)
(1) or D01 (female) (4) wiring harness and
chassis ground
Safety lock lever
Lock
Free
V01 (male)
Between (1) and (2)
D01 (male)
Between (4) and (8)
Resistance
Min. 1 Mz
Max. 1 z
Resistance
20 – 60 z
Min. 1 Mz
Resistance (Continuity)
Min. 1 Mz (No continuity)
Max. 1 z
Resistance
Max. 1 z
Resistance
Max. 1 z
Resistance
Resistance Min. 1 Mz
Resistance Min. 1 Mz
PC130-7
E-8