Toro Greensmaster 3120 - Page 91

TractionCircuitTesting–WheelMotorEfciencyTest
(continued)
GPM)ormorethroughasinglestationarywheelmotorunderloadindicatesan
internalleakinthewheelmotor.Awornwheelmotorislessefcient.Eventually,
enoughuidby−passwillcausethewheelmotortostallunderheavyload
conditions.Continuedoperationcangenerateexcessiveheat,causedamageto
sealsandothercomponentsinthehydraulicsystem,andaffectoverallmachine
performance.
Therearemomentsduringwheelmotoroperation(gerollerposition)whenuid
owthroughthemotorislessrestricted.Ifawheelmotoristestedinthis
position,thetestresultswillbehighershouldnotbeusedtodeterminewheel
motorefciency.T estwheelmotorsinthree(3)differentwheelpositionstoobtain
accuratetestresults.Recordtestreadingsforallthree(3)wheelpositionsand
usetheaverageforthenaltestresult.
SpecialEquipmentRequired:
•FlowMeterwithPressureGaugethathasatleasta57LPM(15GPM)
capacity.
•Phototach(non−contacttachometer).
1.Parkmachineonalevelsurface.TheengineshouldbeOFF .
2.ReadandadheretotheinformationprovidedinT estingtheHydraulicSystem
(page4–35).
3.Makesurethattractionpedalisadjustedtotheneutralposition.
4.Attachaheavychaintotherearofthemachineframeandanimmovable
objecttopreventthemachinefrommovingduringtesting.
g215375
Figure32
1.Tractionpump
2.Hosefromtractionpump“A”port
5.Disconnecthosefromtractionpump“A”port;refertoFigure32.
Greensmaster3120
Page4–45
HydraulicSystem:TestingtheHydraulicSystem
17230SLRevC