SUNWARD SWE50E - Page 190

OPERATION & MAINTENANCE MANUAL SWE50E/SWE60E/SWE70E/SWE80E9/SWE100
182
Hydraulic system
Problem
Cause
remedy
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