Case 590ST - Hydraulic Pump

8-TROUBLESHOOTING
Hydraulicpump
PROBLEMPOSSIBLECAUSECORRECTION
Wornordamagedpumpgearsor
pressureplates.
Makeahydraulicpumpperformance
test.
Aeration:airenteringthesystemsat:
suctiontube,pumpshaft,ttingsor
cylinderringnuts.
Makeahydraulicpumpperformance
test.
Cavitation:systemrestrictionsinthe
suctionlineorinthetanklter.
Makeavisualcheckand/ora
hydraulicpumpperformancetest.
Waterinthesystem.
Checkforpossibleleaksand
eliminatethem.
Thesystemreliefvalvevibrates.Checkthesystemreliefvalve;adjust
andoverhaul,ifnecessary.
Vibrationsinthelines.Visuallycheck.
Coldhydraulicoil.Checkthehydraulicoiloperating
temperature.
Noisysystem.
Wrongoiltype.
Changethehydraulicoil.
Tankoverlled.Checkthehydraulicoillevel.
Aeration:airenteringthesystemat:
suctiontube,pumpshaft,ttingsor
cylinderringnuts.
Makeahydraulicpumpperformance
test.
Hydraulicoildrainthroughtank
breather.
Cavitation:Restrictionofthesuction
lterinthetank.
Makeavisualcheckand/ora
hydraulicpumpperformancetest.
Lowoilquantity.Fillthetank.
Contaminatedoil.Drainthetankandrellwithcleanoil.
Toohigh/lowsettingofthereliefvalve.Drainthetankandrellwithcleanoil.
Testreliefvalves.
Oilinsystemtoolight.Drainthetankandrellwithoilwith
thecorrectviscosity.
Oilheating.
Oilcoolernsobstructed.Cleantheoilcooler.
Oilleaksthroughtheshaftseal.Wornshaftseal.Replacetheshaftsealandinspect
thepump.
Lowoillevel.Fillthetank.
Airinthesuctionsystem.
Checkandtightenthesuctionlines.
Foamyoil.
Wrongoiltype.
Changethehydraulicoil.
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