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Troubleshooting
Safety, Operation and Maintenance Manual - Aug 2012
6-27
SY115C9/135C/155H Crawler Hydraulic Excavator
Failure
Causes
Remedy
Boom-up pilot pressure
reading incorrect
●
5V power supply failure
●
Open circuit of signal line
●
Short circuit of signal line
●
Sensor failure
●
Repair/replace
●
Check/repair
●
Check/repair
●
Replace
Boom-down pilot pres-
sure reading incorrect
●
5V power supply failure
●
Open circuit of signal line
●
Short circuit of signal line
●
Sensor failure
●
Repair/replace
●
Check/repair
●
Check/repair
●
Replace
Bucket-dig pilot pressure
reading incorrect
●
5V power supply failure
●
Open circuit of signal line
●
Short circuit of signal line
●
Sensor failure
●
Repair/replace
●
Check/repair
●
Check/repair
●
Replace
Bucket-dump pilot pres-
sure reading incorrect
●
5V power supply failure
●
Open circuit of signal line
●
Short circuit of signal line
●
Sensor failure
●
Repair/replace
●
Check/repair
●
Check/repair
●
Replace
Swing pilot pressure
reading incorrect
●
5V power supply failure
●
Open circuit of signal line
●
Short circuit of signal line
●
Sensor failure
●
Repair/replace
●
Check/repair
●
Check/repair
●
Replace
Travel pilot pressure
reading incorrect
●
5V power supply failure
●
Open circuit of signal line
●
Short circuit of signal line
●
Sensor failure
●
Repair/replace
●
Check/repair
●
Check/repair
●
Replace
Table 6-3