Noblelift FE4P50N, Operation And Maintenance Manual

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Fault Cause Elimination
Lift pressure too low
Slide valve get stuck Break up, cleaning
Oil pore jam Break up, cleaning
Vibration
Pressure up too slowly
Slide valve get stuck Break up, cleaning
Exhaust not enough Exhaust enough
Vibration
Pressure up too slowly
Slide valve get stuck Break up, cleaning
Exhaust not enough Break up, cleaning
Liquid level less than
normal
Flooding valve poor regulated Fine-tune
Noise
Flooding valve poor regulated Fine-tune
Glide face abrasion Replace flooding valve
Leak (Outside) O ring old or damage Replace O ring
Enactment pressure
too low
Spring bad Replace spring
Valve base bad Adjust or replace flooding valve
Leak (inside) Valve base bad Amend valve base surface
Enactment pressure
too high
Valve get stuck Break up, cleaning
（
2
）
Hydraulic pump fault diagnosis (See List 2-12
）
List 2-12
Fault Cause Elimination
Liquid displacement
too
small
Liquid level too low Infuse liquid to normal
Pipe or filter jam Clean or replace
Pump pressure too low
● Lining slice bad
● Brace bad
● Seal, lining sleeve seal or
spacer ring badness
Replace
Flooding valve regulated
abnormal
Regulate to normal by
manometer
Air in system
● Retighten pipe beside oil inle
● Infuse liquid
● Replace pump seal
Running noise
Suction pipe bad or filter jam Check pipe or repair filter
Oil inlet side loose or air
leakage
Tighten loose connecting
Oil viscidity too high
Replace normal viscidity oil to
adapt running
tempdrature
Bubble in liquid Exhaust air and prevent air
Oil leakage of pump
Pump seal or other airproof ring
bad
Replace
Pump failure Replace