Toro ProLine H800 Service Manual page 104

Testing the Traction Circuit - Charge Pressure (continued)
Hydraulic System: Testing the Hydraulic System
g292480
1. Hydraulic pressure test port
2. Hydraulic fluid filter
7. Gain access to the charge pressure test port
8. Clean the charge pressure test port. Loosen and remove the cap from the
test port.
9. Install a pressure gauge (below 300 psi) to the test port.
10. Install a pressure gauge (below 2000 psi) to the traction pump "A" port.
11. Attach a heavy chain to the rear of the machine frame and an immovable
object to prevent the machine from moving during testing.
12. Block the wheels with chocks to prevent the wheels rotation during testing.
13. Start the engine and move the throttle to full speed (3,210 rpm) position. Use
a phototac to check that the engine speed is correct.
14. Record the reading on the charge test port pressure gauge. The charge
pressure without load should read 5.6 to 7 bar (81 to 101.5 psi). If the
charge pressure specification is not met, consider the following:
A. The hydraulic pump charge relief valve is damaged. Repair or replace
the hydraulic pump charge relief valve; refer to
Piston Pump (page
15. Sit in the operator's seat, release the parking brake, and slowly press the
traction pedal forward until the pressure reached to 100 to 115 bar (1450 to
1668 psi) on the traction circuit pressure gauge and then to reverse while
monitoring the charge test port pressure gauge.
16. Record the reading on the charge test port pressure gauge (under load).
The charge pressure (under load) should not drop more than 20% when
compared to the charge pressure (without load) recorded in para 14.
If the specifications are not met, perform the hydraulic pump flow and traction
relief pressure test; refer to
Flow and Relief Pressure (page
17. Release the traction pedal, move the throttle to low speed position, and shut
off the engine.
Figure 46
3. Radiator
5–86).
Testing the Traction Circuit - Hydraulic Pump
5–44).
Page 5–36
(Figure 46).
Servicing the Hydraulic
ProLine H800
19241SL Rev A