Toro Groundsmaster 4300-D Service Manual page 142

Test Procedure (continued)
Hydraulic System: Testing the Hydraulic System
10. If the measured pressure is incorrect, remove the pressure reducing valve
(PRV) from the lift control manifold and clean or replace the valve; refer to
Servicing the Lift Control Manifold (page
11. Also, if the lift circuit pressure is low, check for the restriction in gear pump
inlet line. The Internal lift cylinder leakage would also cause low lift circuit
pressure; refer to Testing the Lift Circuit–Lift Cylinder Internal Leakage (page
4–81). The gear pump (P4) could also be suspected for wear, damage or
inefficiency; refer to
4–84).
12. After you complete the testing, shut off the engine, and disconnect the
pressure gauge from the lift control manifold test port.
13. Start the engine, check for hydraulic-fluid leaks, repair any leaks as required,
and fill the hydraulic tank with the correct quantity of new hydraulic fluid
before returning the machine to service.
4–142).
Testing the Lift Circuit–Gear Pump (P4) Flow (page
Page 4–80 Groundsmaster ® 4300-D
16226SL Rev C