Swing Holding Brake Does Not Operate Normally - Komatsu Galeo PC138US-8 Shop Manual

SEN02467-00
E-20 Swing holding brake does not operate normally
Trouble (1) When swing lock switch is operated, swing lock monitor does not light up or go off.
• Condition of swing lock switch signal can be checked with monitoring function.
Related
(Machine monitor system code: 04502 Monitor input 3)
information
(Pump controller system code: 02200 Switch input 1)
Defective swing lock switch
1 (Internal disconnection or
short circuit)
Disconnection in wiring har-
ness (Disconnection in wiring
2
or defective contact in con-
Possible causes
nector)
and standard
value in normal
state
Ground fault in wiring har-
3 ness (Short circuit with GND
circuit)
4 Defective machine monitor
(2) When swing lock switch is turned ON, swing lock does not operate. (Hydraulic drift of swing occurs
Trouble
on slope.)
Related
information
Defective swing lock switch
1
(Internal short circuit)
Possible causes
Defective swing holding
and standard
2 brake release switch (Inter-
value in normal
nal short circuit)
state
Hot short (Short circuit with
3
24V circuit) in wiring harness
36
Cause Standard value in normal state/Remarks on troubleshooting
a Prepare with starting switch OFF, then carry out troubleshoot-
Between (5) – (6)
a Prepare with starting switch OFF, then carry out troubleshoot-
Wiring harness between CM02 (female) (5)
– J01 – S04 (female) (5)
Wiring harness between S04 (female) (6) –
J02 – chassis ground (T08)
a Prepare with starting switch OFF, then carry out troubleshoot-
Wiring harness between CM02 (female) (5)
– J01 – S04 (female) (5), – C01 (female)
(19)
a Prepare with starting switch OFF, then turn starting switch ON
chassis ground
Cause Standard value in normal state/Remarks on troubleshooting
a Prepare with starting switch OFF, then carry out troubleshoot-
Between (3) – (4)
a Prepare with starting switch OFF, then carry out troubleshoot-
Between (13) – (14)
a Prepare with starting switch OFF, then turn starting switch ON
Wiring harness between D01 (female) (3) –
J04 – S04 (female) (3), – S25 (female) (14)
Wiring harness between S04 (female) (4) –
V03 (female) (2), – D03 (female) (3)
ing without turning starting switch ON.
S04 (male) Swing lock switch
ing without turning starting switch ON.
ing without turning starting switch ON.
and carry out troubleshooting.
CM02 Swing lock switch
Between (5) –
ing without turning starting switch ON.
S04 (male) Swing lock switch
ing without turning starting switch ON.
Swing holding brake
S25 (male)
release switch
and carry out troubleshooting.
40 Troubleshooting
Resistance
OFF Min. 1 Mz
Max. 1 z
ON
Resis-
tance
Resis-
tance
Resis-
tance
Voltage
OFF 20 – 30 V
ON Max. 1 V
Resistance
OFF Min. 1 Mz
Max. 1 z
ON
Resistance
Lock Min. 1 Mz
Max. 1 z
Release
Voltage Max. 1 V
Voltage Max. 1 V
PC138US, USLC-8
1
Max. 1 z
Max. 1 z
Min. 1 Mz