500 Troubleshooting of hydraulic and mechanical system (H-mode)
H-22 Upper structure does not swing
40-500 32 PC200, 200LC, 220, 220LC-8M0
SEN06139-00
H-22 Upper structure does not swing
Failure (1) Upper structure swings neither to the right nor left
Related infor-
mation
q Perform all troubleshooting with working mode in power mode (P).
Probable
causes and cri-
teria
Cause Criteria and troubleshooting procedure
1
Malfunction of swing holding
brake solenoid valve
a Be ready with engine stopped, then troubleshoot with engine
high idle.
Left work equipment control
lever
Output pressure of swing holding
brake
solenoid valve
Neutral
0 MPa
{0 kg/cm
2
}
Left swing
Right swing
Approx. 2.9 MPa
{Approx. 30 kg/cm
2
}
2
Malfunction of swing control
valve (spool)
Spool of swing control valve may malfunction. Check the spool.
3
Malfunction of swing motor
(swing holding brake)
Swing brake may malfunction. Check it.
4
Improper adjustment or Mal-
function of swing motor
(safety valve)
a Be ready with engine stopped, then troubleshoot with engine
high idle.
Swing lock
switch
Left work equipment
control lever
Swing relief pressure
ON
Swing to hydraulic
relief
28.9 to 32.9 MPa
{295 to 335 kg/cm
2
}
If normal oil pressure is not obtained by adjustment, swing motor
safety valve may malfunction or may internal defect. Check it.
5 Defective swing motor
a Be ready with engine stopped, then troubleshoot with engine
high idle.
Swing lock
switch
Left work equipment
control lever
Leakage from swing
motor
ON
Swing to hydraulic
relief
Below 10 l/min
6 Defective swing machinery
Swing machinery may have internal defect. Check it.
* It may be checked by abnormal sound, abnormal heating,
metal chips in drain oil, etc.
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