Toro Greensmaster 3120 Service Manual page 89

Traction Circuit Testing – Charge Pressure Test (continued)
Greensmaster 3120
17230SL Rev C
A. The charge relief valve (CV) in the mower manifold is faulty. Repair
or replace the charge relief valve (CV); refer to
Manifold (page
B. Gear pump (P3) is faulty (steering/lift circuit performance will also be
affected). Test gear pump (P3) flow (see Gear Pump (P3) Flow Test
in this chapter).
13. Sit in the operator's seat, release the parking brake, and apply a load to the
traction pump by slowly depressing the forward traction pedal until 6895 to
10342 kPa (1000 to 1500 PSI) is reached on the flow meter pressure gauge.
14. Record reading on pressure gauge from the PT port of the mower manifold
(not the pressure gauge on the flow meter).
15. Release traction pedal, move throttle to low speed and turn the engine OFF.
16. Charge pressure (under load) should not drop more than 20% when
compared to charge pressure (without load) recorded in step12.
If specifications are not met, perform Traction Pump (P1) Flow and Traction
Relief Pressure Test as described in
(P1) Flow and Relief Pressure Test (page
4–99).
Traction Circuit Testing – Traction Pump
Page 4–43 Hydraulic System: Testing the Hydraulic System
Servicing the Mower
4–47).