Groundsmaster 4300--D Hydraulic SystemPage 4 -- 33
Which Hydraulic Tests Are Necessary?
Before beginning anyhydraulic test, identify ifthe prob-
lemisrelatedtothetractioncircuit,cutting(mow)circuit,
lift circuit or steeringcircuit. Once the faulty systemhas
been identified, perform tests that relate to that circuit.
1. If atraction circuit problemexists, considerperform-
ing one or more of the following tests: Traction Circuit
Relief Valve (R3) and (R4) Pressure, Traction Circuit
Charge Pressure, Gear Pump (P3) Flow, Front Wheel
Motor Efficiency and/or Piston (Traction) Pump Flow
Tests.
IMPORTANT: Refer to Traction Circuit Component
Failure in the General Information section of this
chapterforinformationregardingtheimportanceof
removing contamination from the traction circuit.
2. If a cutting (mow) circuit problem exists, consider
performing one or more of the following tests: Relief
Valve (PRV1) and (PRV2) Pressure, Gear Pump (P1)
and (P2) Flow and/or Deck Motor Efficiency Tests.
3. If a lift circuit problem exists, consider performing
oneormoreofthefollowingtests:LiftReliefValve(PRV)
Pressure, Gear Pump (P4) Flow and/or Lift CylinderIn-
ternal Leakage Tests.
4. Ifasteeringcircuitproblemexists,considerperform-
ing one or more of the following tests: Steering Relief
Valve (R10) Pressure, Steering Cylinder Internal Leak-
age and/or Gear Pump (P3) Flow Tests.
Hydraulic
System
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