CASE CONSTRUCTION 1107EX - Hydraulic systems - Troubleshooting

8-TROUBLESHOOTING
Hydraulicsystems-Troubleshooting
Problem
PossibleCauseCorrection
Machinenotmovingin
forward/reversedirection
Parkingbrakeswitchappliedand/ortowing
valveintowingposition
Setparkingbrakeswitchand/ortowing
valvetodrivingposition.SeeSec.“4-op-
eratinginstructions”
LackofoilinhydraulicoiltankCheckoillevelinthehydraulicoiltankand
rellfreshoil,ifnecessary.SeeSection
“6-Workingoperation”
Errorintheadjustingdeviceforthecon-
trolleveronthevariabledisplacementhy-
draulicpump
Checkadjustingdeviceforcorrectfunction
andreadjust,ifnecessary
Propulsioninterrupted
Checkcouplingbetweenengineandvari-
abledisplacementhydraulicpumpaswell
asconnectionbetweenthevariabledis-
placementhydraulicmotorandthedrums
andhavethemoverhauled,ifnecessary,
bytheserviceengineer
NoorinsufcientchargepressureCheckchargereliefvalvesettingonTravel
&vibrationpumpORcontactCASECON-
STRUCTIONdealer.
Hydraulicoillterclogged
Suctionlineclogged
Checksuctionlineandreplacehydraulicoil
lterelement
Driverofchargepumpshearedoff
Chargecircuitpressurereliefvalvenot
closingin
ContactCASECONSTRUCTIONDealer
Lowanductuatingchargepressure.Air
causesnoisewithinhydrostaticdrive
Tightenallconnectionsbetweenthehy-
draulicoiltankandthechargepump
throughwhichairmaypenetrate
Internalcomponentsinvariabledisplace-
menthydraulicpumporhydraulicmotors
damaged
ContactCASECONSTRUCTIONDealer
Chargecircuitnon-returnvalvesdefectiveContactCASECONSTRUCTIONDealer
Internalcomponentsinvariabledisplace-
menthydraulicpumporhydraulicmotor
damagedasseenby:
Brassparticles,chips,ofakesinhydraulic
oiltankandlter
ContactCASECONSTRUCTIONDealer
Verynoisyoperationofvariabledisplace-
menthydraulicpumporhydraulicmotors
Tightenallconnectionsbetweenthehy-
draulicoiltankandthechargepump
throughwhichairmaypenetrate
No,lowoructuatingchargepressureReplacehydraulicoillterortightenallcon-
nectionsbetweenthehydraulicoiltankand
thechargepumpthroughwhichairmay
penetrate
HydraulicoilltercloggedReplacehydraulicoillter
Parkingbrakenotreleasing
Replacehydraulicoillterortightenallcon-
nectionsbetweenthehydraulicoiltankand
thechargepumpthroughwhichairmay
penetrate
Propulsionoperatingin
onedirectiononly
Errorordefectinadjustingdeviceforthe
controlleverofthevariabledisplacement
pump
Checkandadjustdeviceforcorrectfunc-
tionandreadjustifnecessary
MainpressurereliefvalvesnotclosingTightenmainpressurereliefvalves.If
propulsiondoesnotyetoperateintheother
direction,exchangebothmainpressurere-
liefvalvesagainsteachother.Ifpropulsion
nowoperatesinotherdirection,oneofthe
mainpressurereliefvalvesdoesnotclose.
ContactCASECONSTRUCTIONDealer
Chargecircuitnon-returnvalvesdefectiveContactCASECONSTRUCTIONDealer
8-6