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Troubleshooting
Safety, Operation and Maintenance Manual - Aug 2012
6-38
SY115C9/135C/155H Crawler Hydraulic Excavator
Failure
Causes
Remedy
Excessive hydraulic drift of swing
When swing brake
engaged
●
Swing brake control line failure
●
Swing motor (parking brake) failure
●
Check/repair
●
Repair/replace
When swing brake
disengaged
●
Swing control valve (spool) failure
●
Swing motor (relief valve) failure
●
Swing motor (feed valve) failure
●
Repair/replace
●
Repair/replace
●
Repair/replace
Table 6-5