Toro 75746 - Purging Procedure

HydroChangeProcedure(continued)
2.Disconnectthebatterybyremovingthenegativecablerst,thenthepositive
cablefromthebattery.
3.Removethespinonoillter.
4.Drainthehydraulicoil.
5.Installanewspinonoillter.
6.Removethetopportplugfromthehydro.
g334863
Figure58
1.T opPortPlug2.BreatherHole
7.Removethebreatherhoseandllventlocatedonthetopofthehydro.
8.Fillapproximately2quartsofToroHYPR-OIL®or20W-50engineoiltothe
levelofthetopportplughole.
9.Re-installthetopportplug.Figure58
10.Re-installthebreatherhose.
11.Connectthebatterybyinstallingthepositivecablerst,thenthenegative
cabletothebattery.
12.Performthepurgingprocedure.PurgingProcedure(page6–6)
PurgingProcedure
Duetotheeffectsairhasonefciencyinhydrostaticdriveapplications,it
iscriticalthatitbepurgedfromthesystem.Thispurgeprocedureshould
beimplementedanytimeahydrostaticsystemhasbeenopenedtofacilitate
maintenance,anyadditionaloilhasbeenaddedtothesystem,orareplacement
transaxlehasbeeninstalled.Aircreatesinefciencybecauseitscompression
andexpansionrateishigherthanthatoftheoilinhydrostaticdivesystems.
Theresultingsymptomsinhydrostaticsystemsmaybe:
•Noisyoperation
•Lackofpowerordriveafterashortperiodofoperation
•Highoperatingtemperatureandexcessiveexpansionofoil,oillevelmaybe
highintheexpansiontankoroverow
Thefollowingprocedureshouldbeperformedwiththevehiclewheelsoffthe
groundandthenrepeatedunderoperatingconditions.
HydrostaticDriveSystem:ServiceandRepairs
Page6–6
TitanServiceManual
3438-774RevA