Case 580SR Service Manual page 713

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HYDRAULIC PUMP
System noisy
Hydraulic oil drain through tank
breather
Oil heating
Shaft seal oil leakage
Foaming oil
SECTION 35 - HYDRAULIC SYSTEM
PROBLEM
Worn or damaged pump gears or
pressure plates
Aeration: air entering the systems
at: suction tube, pump shaft,
fittings or cylinder ring nuts
Cavitation: restrictions in the
system at the suction line or at
the suction screen in the tank
Water in the system
The system relief valve vibrates
Vibrations in the lines
Cold hydraulic oil
Wrong type oil being used
Tank overfilled
Aeration: air entering the system
at: suction tube, pump shaft,
fittings or cylinder ring nuts
Cavitation: Restriction of the
suction filter in the tank
Oil supply low
Contaminated oil
Setting of relief valve too high or
too low
Oil in system too light
Oil cooler fins blocked
Worn shaft seal
Low oil level
Air in the suction system
Wrong oil type
CAUSE
Make a hydraulic pump performance
test.
Make a hydraulic pump performance
test.
Make a visual check and/or a
hydraulic pump performance test.
Visual check.
Check system relief valve, adjust/
overhaul as necessary.
Visual check.
Check the hydraulic oil operating
temperature.
Investigate/drain and top up.
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 shaft seal and inspect
pump.
Fill the tank.
Check/tighten suction line.
Drain and refill with correct oil.
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CORRECTION