Toro Groundsmaster 4500-D Series - Page 207

Removal(Figure101)(continued)
Note:Acasedrainexistsinthepiston(traction)pumpandasuctionportis
neartheinputshaftofthegearpump(Figure103).Whenthegearpumpis
removedfromthepistonpump,plugpistonpumpcasedrainholetoprevent
drainingthepistonpump.
IMPORTANT
Dryweightofpiston(traction)pumpis41kg(90lbs).
8.Supportthepistonpumptopreventitfromfallingwhileremovingtwo(2)
capscrewsandwashersretainingpumpassemblytoengineywheelplate.
Carefullypullpumpassemblyfromywheelplateandloweritoutofthe
machine.
9.Ifhydraulicttingsaretoberemovedfrompistonpump,marktting
orientationtoallowcorrectassembly.Removettingsfrompumpanddiscard
O-rings.
Installation(Figure101)
1.Ifttingswereremovedfrompistonpump,lubricateandplacenewO-rings
ontottings.Installttingsintopumpportsusingmarksmadeduringthe
removalprocesstoproperlyorientatettings.Tightenttings(seeInstalling
theHydraulicFittings(SAEStraightThreadO-RingFittings)(page5–9)).
IMPORTANT
Topreventspringcouplerdamage,makesurethatpistonpumpis
properlysupportedanddoesnotputsideloadintocouplerduring
pumpinstallation.
2.Carefullyraisepistonpumpintothemachine,alignpumpinputshafttospring
coupleronengineandpositionittotheengineywheelplate.Supportpump
topreventitfromproducinganysideloadintocouplerandalsotoalignpilot
diameterofpumptoywheelplatebore.
3.Whilemaintainingpumpalignmentwithspringcouplerandywheelplate,
installtwo(2)capscrewsandwasherstosecurepistonpumptoengine.
IMPORTANT
Acasedrainexistsinthepiston(traction)pumpandasuctionport
isneartheinputshaftofthegearpump(Figure103).Beforethegear
pumpisinstalledtothepistonpump,makesurethatplugsplacedin
bothoftheseportsareremoved.Failuretoremoveplugswillcause
excessivepressureinthepistonpumpanddamageseals.Also,
beforesecuringgearpumptopistonpump,llpistonpumphousing
withcleanhydraulicoilthroughcasedrainhole.
4.Removeplugsthatwereplacedinpistonpumpcasedrainandgearpump
suctionport.Fillpistonpumphousingwithnewhydraulicoilthroughcase
drainhole.
5.Installgearpumptopistonpump(seeGearPump(page5–97)).
Groundsmaster
®
4500-D/4700-D
Page5–105
HydraulicSystem:ServiceandRepairs
19245SLRevA