CASE CONSTRUCTION 1107EX - Page 148

8-TROUBLESHOOTING
Hydraulicsystems-Troubleshooting
Problem
PossibleCauseCorrection
Exciterdrivenot
functioning(Drumnot
vibrating.)
LackofoilinhydraulictankCheckoillevelinhydraulictankandrell
freshoil,ifnecessary.
Eliminateleaks
Errorintheadjustingdevice
Checkadjustingdeviceforproperfunction
andreset,ifnecessary
Exciterdriveinterrupted
Checkcouplingbetweenengineandpump
aswellasconnectionbetweenconstant
displacementhydraulicmotorandexciter
shaftsandhavethemoverhauled,ifnec-
essarybyCASECONSTRUCTIONDealer
Lowornochargepressure
Checkchargepressure
HydraulicoilltercloggedReplacehydraulicoillter
SuctionlinecloggedCleansuctionline
Chargepumpnotworking,internalcompo-
nentdamageinvariabledisplacementhy-
draulicpumporconstantdisplacementhy-
draulicmotor
ContactCASECONSTRUCTIONDealer
Lowoructuatingchargepressure.Air
causesnoiseinhydrostatic
Tightenallcomponentsbetweenhydraulic
oiltankandthechargepumpthroughwhich
airmaypenetrate
Internaldamageinhydraulicpumporhy-
draulicmotorsaredamaged
GetRepairedbythe“ServiceEngineer’
Chargecircuitnon-returnvalves.
Notfunctioning
ContactCASECONSTRUCTIONDealer
Internalcomponentsinvariabledisplace-
menthydraulicpumporconstantdisplace-
menthydraulicmotordefective
ContactCASECONSTRUCTIONDealer
HydraulicltercloggedReplacehydraulicoillter
ExcitersystemcircuitdefectiveCheckexcitersystemcircuit
Exciterdriveoperatingin
onedirectiononly(only
onefrequencyoperating)
Errorordefectintheadjustingdevicefor
thecontrolleverofthevariabledisplace-
menthydropump
Checktheadjustingdeviceforcorrectfunc-
tionandreadjust,ifnecessary
Operatingoverpressurereliefvalvenot
closing
Tightenmainpressurereliefvalves.If
propulsiondoesnotyetoperateintheother
direction.
Exchangebothoperatingoverpressurere-
liefvalvesagainsteachother.
Ifpropulsionnowoperatesintheother
direction,oneoftheotheroperatingover
pressurereliefvalvesdoesnotclose.Get
itcheckedbyCASECONSTRUCTION
Dealer
Neutralpositioncannot
beobtainedanymore
Errorinadjustingdevice
Checkadjustmentdeviceforproperopera-
tionandreset,ifnecessary
Exciterdriveoverheating
(Exceeding80°C(176°F))
Exciterdriveoverheating(Exceeding80°C
(176°F))
Instantlystopengineanddotroubleshoot-
ingproceduresameaspropulsionheating
Noiseinexciterdrive
Airinexciterdrive,lackofoilinhydraulicoil
tank,suctionlinesleaking
Checkoillinesinhydraulicoiltankandrell
refreshoilifnecessary.
Checksuctionlineforleaks,eliminate
leaks.
Note:Heavyfoaminginthehydraulictank
isanindicatingofairintheexciterdrive
Internalweardamageinvariabledisplace-
menthydraulicpumporconstantdisplace-
menthydraulicmotor
ContactCASECONSTRUCTIONDealer
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