Service Manual

Lift/LowerCircuitProblems
Problem
PossibleCauses
Thegearpumpisnoisy(cavitation).•Thehydraulic-uidlevelinthehydraulictankislow.
•Thehydraulicuidisverycold.
•Thesuctionlineisrestricted.
•Thereareairleaksinthesuctionline.
Thecuttingdeck(orimplement)doesnotliftorliftsslowly.
•Theenginespeedistoolow.
•Theliftcylinderlinkageisbindingorbroken.
•Theliftarmbushingsarebinding.
•Thehydraulic-uidlevelinthehydraulictankislow.
•Thegearpumppressureorowisinsufcient.
•Thegearpumpisdamaged.
•Theimplement-reliefvalve(inthegearpump)isstuckopen.
•Theliftcylinderisleakinginternally.
•Theliftcontrolmanifoldisdamaged.
Thecuttingdeck(orimplement)raises,butdoesnotstayup.•Theliftcylinderisleakinginternally.
•Theliftcontrolmanifoldiswornordamaged.
HydraulicSystem:Troubleshooting
Page4–30
Groundsmaster7210
16222SLRevE