SYSTEM OPERATES SLOWLY
Restriction in filters or lines.
Clean and/or replace elements or lines.
(Cont.)
Improper adjustments.
Check relief valves, etc. Adjust per manual.
Oil leaks.
Tighten fittings. Replace seals or damaged
lines.
OVERHEATING OF OIL IN SYSTEM
Oil passing through relief
Return control valve to neutral when not in
valve for excessive time.
use.
Incorrect oil, low oil, dirty oil.
Use recommended oil, fill reservoir, clean oil,
replace filter element.
Engine running too fast.
Reduce engine speed.
Excessive component
Repair or replace component as necessary.
internal leakage.
Restriction in filters or lines.
Clean and/or replace elements or lines.
Malfunctioning oil cooler.
Clean or repair.
Insufficient heat radiation.
Clean dirt and mud from reservoir and
components.
Malfunctioning component.
Repair or replace.
FOAMING OF OIL
Incorrect, low or dirty oil.
Replace, clean or add oil as needed.
Air leaks.
Check suction line and component seals for
suction leaks. Replace.
NOISY PUMP
Low oil level, incorrect oil,
Replace, clean or add oil as required.
foamy oil.
Suction line plugged,
Clean or replace.
inlet screen plugged.
Worn or damaged pump.
Repair or replace.
LEAKY PUMP OR MOTOR
Damaged or worn shaft seal.
Replace. Check for misalignment.
Loose or broken parts.
Tighten or replace.
LOAD MOVES WITH CONTROL
Control valve not centring
Check for spool binding. Repair.
VALVE IN NEUTRAL
when released.
CONTROL VALVE STICKY (BINDING)
Valve linkage misaligned.
Repair.
Tie-bolts too tight
Loosen as necessary.
(stack valves).
Valve damaged.
Repair or replace.
CONTROL VALVE LEAKS
Tie-bolts too loose
Tighten as necessary.
(stack valves).
Seals damaged or worn.
Replace.
HYDRAULIC SYSTEM TROUBLESHOOTING
10
10-2
HYDRAULIC SYSTEM TROUBLESHOOTING
