Case 570T - Hydraulic pump - Troubleshooting

8-TROUBLESHOOTING
Hydraulicpump-Troubleshooting
Problem
PossibleCauseCorrection
NoisysystemWornordamagedpumpgearsorpressure
plates
Makeahydraulicpumpperformancetest
Aeration:airenteringthesystemsat:suc-
tiontube,pumpshaft,ttingsorcylinder
ringnuts
Makeahydraulicpumpperformancetest
Cavitation:Systemrestrictionsinthesuc-
tionlineorinthetanklter
Makeavisualcheckand/orahydraulic
pumpperformancetest
Waterinthesystem
Checkforpossibleleaksandeliminate
them
ThesystemreliefvalvevibratesCheckthesystemreliefvalve;adjustand
overhaul,ifnecessary
VibrationsinthelinesVisuallycheck
ColdhydraulicoilCheckthehydraulicoiloperatingtempera-
ture
Wrongoiltype
Changethehydraulicoil
Hydraulicoildrain
throughtankbreather
TankoverlledCheckthehydraulicoillevel
Aeration:Airenteringthesystemat:suc-
tiontube,pumpshaft,ttingsorcylinder
ringnuts
Makeahydraulicpumpperformancetest
Cavitation:Restrictionofthesuctionlter
inthetank
Makeavisualcheckand/orahydraulic
pumpperformancetest
Oilheating
LowoilquantityFillthetank
ContaminatedoilDrainthetankandrellwithcleanoil
Toohigh/lowsettingofthereliefvalveDrainthetankandrellwithcleanoil.T est
reliefvalves
OilinsystemtoolightDrainthetankandrellwithoilwiththe
correctviscosity
OilcoolernsobstructedCleantheoilcooler
Oilleaksthroughtheshaft
seal
WornshaftsealReplacetheshaftsealandinspectthe
pump
FoamyoilLowoillevelFillthetank
Airinthesuctionsystem
Checkandtightenthesuctionlines
Wrongoiltype
Changethehydraulicoil
8-15