Groundsmaster 4300--D Hydraulic SystemPage 4 -- 33
Which Hydraulic Tests Are Necessary?
Before beginning any hydraulic test, identify if the prob-
lem is related to thetraction 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 forinformation regardingthe importance of
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
one or more of the followingtests: Lift Relief Valve (PRV)
Pressure, Gear Pump (P4) Flow and/or Lift Cylinder In-
ternal Leakage Tests.
4. If a steeringcircuit 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.
Hydraulic
System
