Toro Groundsmaster 4300-D - Page 190

Note:Theportsonthedeckcontrolmanifoldaremarkedforeasyidentication
ofthecomponents.Example:P1isthepumpP1connectionportandPRV2
isthelocationfortheproportionalreliefvalvePRV2;refertotheHydraulic
SchematicinAppendixA—FoldoutDrawingstoidentifythefunctionofthe
hydrauliclinesandcartridgevalvesateachmanifoldport.
Note:Thedeckcontrolmanifoldusesseveralzero-leakplugs.Theseplugshave
ataperedsealingsurfaceontheplugheadthatisdesignedtoresistvibration
inducedplugloosening.Thezero-leakplugsalsohaveanO-ringasasecondary
seal.Ifzero-leakplugremovalisnecessary,lightlyraptheplugheadusinga
punchandhammerbeforeusinganallenwrenchtoremovetheplug:theimpact
willallowplugremovalwithlesschanceofdamagetothesocketheadoftheplug.
Wheninstallingtheplugs;torquetheplugstothevaluesidentiedinFigure99.
ServicingtheDeckControlManifoldAssembly
WARNING
Beforeopeningthehydraulicsystem,operateallthehydraulic
controlstoreleaseallthepressureinthesystemandavoidinjury
frompressurizedhydraulicuid;refertoReleasingPressurefrom
theHydraulicSystem(page4–6).
1.Ensurethattheentireoutersurfaceofthemanifoldiscleanbeforeyou
removethecartridgevalve.
2.Ifthesolenoidcartridgevalveisbeingserviced,removethenutthatsecures
thesolenoidcoiltothecartridgevalve.Carefullyslidethesolenoidcoiloff
thevalve.
IMPORTANT
Carefullyhandlethevalvecartridge.Slightbendingordistortionof
thestemtubecancausebindingandmalfunction.Whenremoving
thecartridgevalvefromthecontrolmanifold,ensurethatthedeep
wellsocketfullyengagesthevalvebase.
3.Removethecartridgevalvewithadeepwellsocketwrench.Notethecorrect
locationoftheO-rings,sealingrings,andback-uprings.
4.Removeanddiscardthesealkit.
5.Visuallyexaminetheportinthemanifoldfordamagedsealingsurfaces,
damagedthreads,andcontamination.Also,inspectthecartridgevalvefor
damagedsealingsurfacesandcontamination.
A.Contaminationcancausethevalvestostickorhangup.Contamination
canaccumulateinsmallvalveoricesorsealareasandcause
malfunction.
B.Ifthesealingsurfacesofthevalvearepittedordamaged,thehydraulic
systemcanbetoohotortherecanbewaterinthesystem.
CAUTION
Usetheeyeprotectionsuchasgoggleswhenusingthe
compressedair.
HydraulicSystem:ServiceandRepairs
Page4–128
Groundsmaster
®
4300-D
16226SLRevC