Toro Groundsmaster 4000-D Service Manual page 75

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, steering circuit or engine cooling fan 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
Charge Pressure, Traction Circuit Relief Pressure,
Counterbalance Pressure, Rear Traction Circuit (RV)
Relief Pressure, Traction Circuit Reducing Valve (PR)
Pressure 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 4000--D/4010--D
2. If a cutting (mow) circuit problem exists, consider
performing one or more of the following tests: Cutting
Deck Circuit Pressure, PTO Relief Pressure, Cutting
Deck Motor Case Drain Leakage and/or Cutting Deck
Gear Pump Flow Tests.
3. If a lift circuit problem exists, consider performing
one or more of the following tests: Lift/Lower Circuit Re-
lief Pressure and/or Steering and Lift/Lower Gear Pump
Flow Tests.
4. If a steering circuit problem exists, consider perform-
ing one or more of the following tests: Steering Circuit
Relief Pressure, Steering Cylinder Internal Leakage
and/or Steering and Lift/Lower Gear Pump Flow Tests.
5. If a engine cooling fan circuit problem exists, consid-
er performing one or more of the following tests: Engine
Cooling Fan Circuit and/or Engine Cooling Fan Circuit
Gear Pump Flow Tests.
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