Hydraulic Test Selection - Toro Greensmaster 3120 Service Manual

Hydraulic Test Selection

Greensmaster 3120
17230SL Rev C
Hydraulic component output volume relates directly to engine RPM.
For every 100 engine rpm the following component output volumes
will change by the volume listed.
• Traction Pump: 100 engine RPM = 2.03 LPM (0.54 GPM or 68.7 oz.) of
hydraulic fluid displaced per minute
• Gear Pump (P1): 100 engine RPM = 0.95 LPM (0.25 GPM or 32.1oz.) of
hydraulic fluid displaced per minute.
• Gear Pump (P2): 100 engine RPM = 0.54 LPM (0.14 GPM or 18.3 oz.) of
hydraulic fluid displaced per minute
6. Before you perform a test, check the traction control lever linkages for
improper adjustment, binding, or broken parts.
7. When you use a hydraulic tester (pressure and flow), ensure that the inlet and
outlet hoses are properly connected and not reversed to prevent damaging
the hydraulic tester or components.
8. When you use a hydraulic tester (pressure and flow), open the tester load
valve fully before you start the engine to reduce the possibility of damaging
the components.
9. Install the hydraulic fittings by hand and ensure that they are not
cross-threaded before you tighten them with a wrench.
10. Position any test hoses away from parts that may move during the test
procedure.
11. After you connect the test equipment, check the hydraulic-fluid level in the
hydraulic tank and ensure that the fluid level is correct.
12. Perform all the hydraulic tests with the hydraulic fluid at normal operating
temperature.
13. Record the results of all hydraulic tests performed.
Before beginning any hydraulic test, identify if the problem is related to the
traction circuit, cutting (mow) circuit or steering and lift circuit. Once the faulty
system has been identified, perform tests that relate to that circuit.
If a traction circuit problem exists, consider performing one or more of the
following tests: Charge Pressure Test, Wheel Motor Efficiency Test, and/or
Traction Pump (P1) Flow and Relief Valve Tests.
If a cutting (mow) circuit problem exists, consider performing one or more of the
following tests: Circuit Pressure Test, Reel Motor Efficiency/Case Drain Test,
Manifold Relief Pressure Test, and/or Gear Pump (P2) Flow Test.
If a steering or lift circuit problem exists, consider performing one or more of the
following tests: Gear Pump (P1) Flow Test, Relief Valve Pressure Test, Lower
Cutting Units Relief Valve (R2) Pressure Test, and/or Steering Control Valve and
Steering Cylinder Test.
IMPORTANT
Page 4–37 Hydraulic System: Testing the Hydraulic System