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Hydraulic pump - Troubleshooting
Problem
Noisy system.
Hydraulic oil drain
through tank breather.
Oil heating.
Oil leaks through the shaft
seal.
Foamy oil.
8 - TROUBLESHOOTING
Possible Cause
Worn or damaged pump gears or pressure
plates.
Aeration: air entering the systems at: suc-
tion tube, pump shaft, fittings or cylinder
ring nuts.
Cavitation: system restrictions in the suc-
tion line or in the tank filter.
Water in the system.
The system relief valve vibrates.
Vibrations in the lines.
Cold hydraulic oil.
Wrong oil type.
Tank overfilled.
Aeration: air entering the system at: suc-
tion tube, pump shaft, fittings or cylinder
ring nuts.
Cavitation: Restriction of the suction filter
in the tank.
Low oil quantity.
Contaminated oil.
Too high/low setting of the relief valve.
Oil in system too light.
Oil cooler fins obstructed.
Worn shaft seal.
Low oil level.
Air in the suction system.
Wrong oil type.
Make a hydraulic pump performance test.
Make a hydraulic pump performance test.
Make a visual check and/or a hydraulic
pump performance test.
Check for possible leaks and eliminate
them.
Check the system relief valve; adjust and
overhaul, if necessary.
Visually check.
Check the hydraulic oil operating tempera-
ture.
Change the hydraulic oil.
Check the hydraulic oil level.
Make a hydraulic pump performance test.
Make a visual check and/or a hydraulic
pump performance test.
Fill the tank.
Drain the tank and refill with clean oil.
Drain the tank and refill with clean oil. Test
relief valves.
Drain the tank and refill with oil with the
correct viscosity.
Clean the oil cooler.
Replace the shaft seal and inspect the
pump.
Fill the tank.
Check and tighten the suction lines.
Change the hydraulic oil.
8-18
Correction
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Troubleshooting
