SUNWARD SWE60B - Page 121

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Hydraulic System Fault and Maintenance
Fault
Reason
Possible Measures
Hydraulic function
becomes sluggish
Low hydraulic oil level
Low hydraulic oil temperature
Oil type do not match ambient
temperature
Low engine revs
Main pump wear out
Pilot oil circuit malfunction
Main suction oil pump blocked
Add hydraulic oil until specified scale level
is reached
Warm up operation until hydraulic
temperature reaches around 50℃.
Use proper oil
Adjust engine revs or contact distributor
Contact distributor
Contact distributor
Contact distributor
Excessive hydraulic
oil temperature
Improper oil
Low hydraulic oil level
Hydraulic oil polluted
Radiator clogging
Filter clogging
pump suction pipe leakage
main pump wear out
safety valve
improper adjustment on
hydraulic element
Use proper hydraulic oil
Add hydraulic oil to reach specified scale
level
Filter or drain out and refill with proper oil
Clean radiator and front drainer
Clean or replace filter
Contact distributor
Contact distributor
Contact distributor
Contact distributor
Hydraulic oil
produces bubble
Suction piping leakage
Piping twist or depressed
mix water into oil
improper oil
improper oil volume, too high or
too low
Contact distributor
Check hydraulic piping
Drain out and refill with proper hydraulic oil
Drain out and refill with proper hydraulic oil
Keep hydraulic oil within specified level
range
Hydraulic cylinder
acts but cant not lift
loads
Main pump wear out
Main safety valve low pressure
Suction filter clogging
Pump suction pipe leakage
Hydraulic cylinder wear out and
cause internal leaks
Contact distributor
Contact distributor
Clean or replace oil suction filter
Check oil suction piping
Replace piston ring or contact distributor