Swing Holding Brake Does Not Operate Normally - Komatsu PC130-8 Shop Manual

SEN04123-01
E-21 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)
Defective swing holding
Possible causes
2 brake release switch (Inter-
and standard
nal short circuit)
value in normal
state
Hot short (Short circuit with
3
24V circuit) in wiring harness
42
Cause Standard value in normal state/Remarks on troubleshooting
a Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
Between (5) – (6)
a Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
Wiring harness between CM02 (female) (5)
– J02 – S04 (female) (5)
Wiring harness between S04 (female) (6) –
J05 – chassis ground (T07)
a Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
Wiring harness between CM02 (female) (5)
– J02 – S04 (female) (5), – CP01 (female)
(19) and chassis ground
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
Between (5) –
chassis ground
Cause Standard value in normal state/Remarks on troubleshooting
a Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
Between (3) – (4)
a Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
Between (13) – (14)
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
Wiring harness between D01 (female) (3) –
J02 – S04 (female) (3), – S25 (female) (14)
and chassis ground
Wiring harness between S04 (female) (4) –
V03 (female) (1), – D03 (female) (3) and
chassis ground
S04 (male) Swing lock switch
CM02 Swing lock switch
S04 (male) Swing lock switch
Swing holding brake
S25 (male)
release switch
Release
40 Troubleshooting
Resistance
OFF Min. 1 Mz
Max. 1 z
ON
Resis-
tance
Resis-
tance
Resis-
Min. 1 Mz
tance
Voltage
OFF 20 – 30 V
ON Max. 1 V
Resistance
Max. 1 z
OFF
ON Min. 1 Mz
Resistance
Lock Min. 1 Mz
Max. 1 z
Voltage Max. 1 V
Voltage Max. 1 V
1
Max. 1 z
Max. 1 z
PC130-8