Toro GroundsmasterR 4300-D Service Manual page 65

Which Hydraulic Tests Are Necessary?
Before beginning any hydraulic test, identify if the prob-
lem is related to the traction circuit, cutting (mow) circuit,
lift circuit or steering circuit. Once the faulty system has
been identified, perform tests that relate to that circuit.
1. If a traction circuit problem exists, consider perform-
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
chapter for information regarding the importance of
removing contamination from the traction circuit.
Groundsmaster 4300--D
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
one or more of the following tests: Lift Relief Valve (PRV)
Pressure, Gear Pump (P4) Flow and/or Lift Cylinder In-
ternal Leakage Tests.
4. If a steering circuit problem exists, consider perform-
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.
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