Toro Groundsmaster 4300-D - Testing the Mow Circuit-Gear Pump (P1) and (P2) Flow

TestingtheMowCircuit–GearPump(P1)and(P2)Flow
g192620
Figure68
Thegearpump(P1)and(P2)owtestisthelastinaseriesoftests
recommendedtodeterminecuttingunitcircuitperformance.ThegearpumpP1
supplieshydraulicowtotherearcuttingdecks,whilegearpumpP2provides
hydraulicowtothefrontcuttingdecks.
ThistestcomparesuidowatNoLoadwithuidowUnderLoad.Adropin
owunderloadofmorethan15%indicatesthegearsandwearplatesinthe
pumphaveworn.Awornpumpmaybypassthehydraulicuidthatreduces
thepumpefciency.Aftersometime,sufcientuidlosscausesthedeckto
stallunderheavyloadconditions.Continuedoperationwithaworn,inefcient
pumpcangenerateexcessiveheatandcausedamagetothesealsandother
componentsinthehydraulicsystem.
SpecialEquipmentRequired:Flowmeterwithpressuregaugethathasatleasta
56.8L/minute(15gallons/minute)capacity.
Groundsmaster
®
4300-D
Page4–69
HydraulicSystem:TestingtheHydraulicSystem
16226SLRevC