Hydraulic Pump - Troubleshooting - Case 570T Operator's Manual

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
8-15
Correction