Swing Holding Brake Does Not Operate Normally - Komatsu PC210-8 Shop Manual

UEN00244-02
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 infor-
(Machine monitor system code: 04502 Monitor input 3)
mation
(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
Possible causes
or defective contact in con-
and standard
nector)
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 infor-
mation
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
46
Cause
a Prepare with starting switch OFF, then carry out troubleshooting
Between (5) – (6)
a Prepare with starting switch OFF, then carry out troubleshooting
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 troubleshooting
Wiring harness between CM02 (female) (5) –
J02 – S04 (female) (5), – C01 (female) (19)
a Prepare with starting switch OFF, then turn starting switch ON
chassis ground
Cause
a Prepare with starting switch OFF, then carry out troubleshooting
Between (3) – (4)
a Prepare with starting switch OFF, then carry out troubleshooting
Between (13) – (14)
a Prepare with starting switch OFF, then turn starting switch ON
Wiring harness between D01 (female) (3) –
J02 – S04 (female) (3), – S25 (female) (14)
Wiring harness between S04 (female) (4) –
V03 (female) (1), – D03 (female) (3)
Standard value in normal state/Remarks on troubleshooting
without turning starting switch ON.
S04 (male) Swing lock switch
without turning starting switch ON.
without turning starting switch ON.
and carry out troubleshooting.
CM02 Swing lock switch
Between (5) –
Standard value in normal state/Remarks on troubleshooting
without turning starting switch ON.
S04 (male) Swing lock switch
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
Resist-
ance
Resist-
ance
Resist-
ance
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
Voltage
PC210, 230, 240-8
1
Max. 1 z
Max. 1 z
Min. 1 Mz
Max. 1 V
Max. 1 V