Service Manual

RemovingthePiston(Traction)Pump(continued)
g035230
Figure123
1.Hydraulichose
4.Lockwasher(4each)
2.Flange
5.O-ring
3.Bolt(4each)
Note:Machineswithserialnumberbelow313000300haveaRexrothpiston
(traction)pump(Figure121).Machineswithserialnumberabove313000300
haveaSauer-Danfosspistonpump(Figure122).Removalandinstallationofthe
pistonpumpisverysimilarregardlessofthepumpbrand.
1.Parkthemachineonalevelsurface,lowerthecuttingdecks,shutoffthe
engine,settheparkingbrake,andremovethekeyfromthekeyswitch.
2.Removethehoodtogetaccesstothehydraulicpumps;refertoRemoving
theHood(page7–37).
3.Drainthehydraulicreservoir.
4.Cleantheexteriorofthepumpassemblyincludingthehydraulichosesbefore
removingthepumptopreventcontaminantsfromenteringintothehydraulic
system.
5.Forassemblypurposes,labelthewireharnessleadsoftractionpump
solenoids.Disconnectthewireharnessconnectorsfromthe2solenoids
onthepump.
6.ReadtheGeneralPrecautionsforRemovingandInstallingtheHydraulic
SystemComponents(page4–95).
7.Labelallthehydraulichoseconnectionsforassemblypurposes.
8.Putadrainpanbelowthepumpassembly,andremoveallofthehydraulic
hosesconnectedtothepistonandgearpumps.Thetractioncircuitsupply
hoseangesareshowninFigure123.
9.Installplugsorcapsonthedisconnectedhydraulichosesandttingsto
preventcontaminantsfromenteringintothesystem.
10.Removethegearpumpfromthemachine;refertoRemovingtheGear
Pump(page4–109).
HydraulicSystem:ServiceandRepairs
Page4–114
Groundsmaster5900TractionUnit
08159SLRevC