Toro Groundsmaster 4500-D Series - Page 339

Testing(continued)
4.Putsensingendofsenderinacontainerofoilwithathermometerandslowly
heattheoil(Figure219).
CAUTION
Handlethehotoilwithextremecaretopreventpersonalinjuryorre.
Note:Priortotakingresistancereadingswithadigitalmultimeter,shortthe
metertestleadstogether.Themeterwilldisplayasmallresistancevalue
(usually0.5ohmsorless).Thisresistanceisduetotheinternalresistance
ofthemeterandtestleads.Subtractthisvaluefromthemeasuredvalueof
thetestedcomponent.
Note:Useainfraredtemperatureinstrumenttomeasuretheoiltemperature.
5.Checkresistanceofthesenderwithamultimeter(ohmssetting)astheoil
temperatureincreases.
A.Themetershouldindicatefrom11.6to13.5kiloohmsat20ºC(68ºF).
B.Themetershouldindicatefrom2.3to2.5kiloohmsat60ºC(140ºF).
C.Themetershouldindicatefrom605to669ohmsat100ºC(212ºF).
D.Replacesenderifspecicationsarenotmet.
6.Afterallowingthesendertocool,installsenderintoaxlemotor:
A.InstallnewO−ringonsenderandthreadsenderintomotorport.T orque
senderfrom12.3to14.9N·m(9to11ft−lb).
B.Connectwireharnessconnectortosender.
7.Checkandllhydraulicsystemtoproperlevel.
Groundsmaster
®
4500-D/4700-D
Page6–57
ElectricalSystem:ComponentTesting
19245SLRevA