Case 580SR+ - Page 713

SECTION 35 - HYDRAULIC SYSTEM 123
HYDRAULIC PUMP
PROBLEM CAUSE CORRECTION
System noisy 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
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.
Hydraulic oil drain through tank
breather
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
Check the hydraulic oil level.
Make a hydraulic pump performance
test.
Make a visual check and/or a
hydraulic pump performance test.
Oil heating Oil supply low
Contaminated oil
Setting of relief valve too high or
too low
Oil in system too light
Oil cooler fins blocked
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.
Shaft seal oil leakage Worn shaft seal Replace shaft seal and inspect
pump.
Foaming oil Low oil level
Air in the suction system
Wrong oil type
Fill the tank.
Check/tighten suction line.
Drain and refill with correct oil.
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