Toro Field Pro 6040 - Servicing the Cartridge Valves

ServicingtheCartridgeValves
Note:Forsolenoidstylecartridgevalvecoiltestinginformation;refertoHydraulic
SolenoidValveCoils(page6–24).
ReadandadheretotheinformationprovidedinGeneralPrecautionsfor
RemovingandInstallingtheHydraulicSystemComponents(page5–46)priorto
removinghydraulicsystemcomponents.
1.Parkthemachineonalevelsurface,loweranyattachments,engagethe
parkingbrake,setthekeyswitchtotheOFFpositionandremovethekey
fromthekeyswitch.
2.Removethehood.
3.Ensurethatthemanifoldiscleanbeforeyouremovethecartridgevalve
fromthemanifold.
4.Removethecartridgevalve:
A.Forsolenoidstylevalves,disconnectthewireharnessconnectorand
removethenutthatsecuresthesolenoidcoiltothecartridgevalve.
Carefullyslidethecoiloffthevalve.
IMPORTANT
Handlethecartridgevalvecarefully.Slightbendingordistortion
ofthestemtubecancausebindingandmalfunction.When
removingthecartridgevalvefromthemanifold,ensurethatthe
deepwellsocketfullyengagesthevalvebase.
B.Useadeepsocketwrenchtoremovethecartridgevalvefromthe
manifold.
5.RecordthecorrectlocationoftheO-rings,thesealingrings,andtheback-up
rings.Removeanddiscardthesealkitfromthecartridgevalve.
6.Visuallyinspectthemanifoldportandthecartridgevalve:
A.Checkfordamagedthreadsonthecartridgevalveandinthemanifold
block.
B.Ifvalvesealingsurfacesappearpittedordamaged,thehydraulicsystem
maybeoverheatingortheremaybewaterinthesystem.
C.Contaminationmaycausevalvestostickorhangup.Contamination
canbecomelodgedinsmallvalveoricesorsealareascausingvalve
malfunction.
CAUTION
Useeyeprotectionsuchasgoggleswhenusingcompressedair.
Note:Particlesasneastalcumpowdercanaffecttheoperationofhigh
pressurehydraulicvalves.
7.Cleanthecartridgevalve.
A.Fornon-solenoidoperatedvalves:Submergethevalveincleanmineral
spiritstoushoutcontamination.Ifthevalvedesignallows,usea
non–metallicprobetopushtheinternalspoolinandout20to30times
toushoutcontamination.Cleananddrythecartridgevalvewith
compressedair.
B.Forsolenoidoperatedvalves:T emporarilyinstallthesolenoidonthe
cartridgevalveandconnecta12voltpowersourcetothesolenoid.
FieldPro®6040
Page5–97
HydraulicSystem:ServiceandRepairs
22267SLRevA