Toro Groundsmaster 360 Service Manual page 108

Test Procedure (continued)
Hydraulic System: Testing the Hydraulic System
Before lifting the machine with a jack, review and follow
Instructions (page 1–7).
5. Lift and support the machine with jack stands so that all the drive wheels
are off the ground. In this test, the drive wheels need to spin freely to allow
hydraulic flow through the traction circuit.
Note: Ensure that the parking brake is not applied.
6. Clean the transmission area around the traction circuit hoses on the top of
the transmission (Figure
7. Determine which piston pump is to be tested. Disconnect the hydraulic hose
from the transmission pump outlet fitting to test the piston pump
47 or Figure 48):
Piston Pump to be Tested
Right side pump
Left side pump
8. Install a 40 GPM hydraulic tester (pressure and flow) in series between
the pump outlet fitting and disconnected hose. Ensure that the tester flow
arrow points from the pump outlet and toward the hose. Ensure that the
flow-control valve on the tester is fully open.
9. Disconnect the balancing hose from the transmission fitting closest to the
transmission pump outlet fitting for the pump to be tested
48). Install a steel cap on the fitting and steel plug in the balancing hose.
10. Sit in the operator seat, start the engine and run it at low-idle speed (1,400
rpm). Check for any hydraulic-fluid leaks from the test connections and
correct before continuing the test.
11. With the engine running, press the engine speed switch to full speed (3,000
rpm) position. Use a phototac to measure the engine speed.
12. Have an operator slowly push the traction pedal to the full F
13. Slowly close the tester flow control valve until the pressure gauge reading is
6,900 kPa (1,000 psi).
14. Check the engine speed with a phototac and ensure that the engine speed is
still 3,000 rpm.
15. Observe the flow gauge on the tester.
Note: The tester reading should be approximately 53 L/minute (14
gallons/minute) for a traction pump in good condition.
16. Open the tester flow control valve, release the traction pedal to the N
position and shut off the engine. Record the test results.
17. A lower pump flow may result in reduced traction circuit performance. If the
flow is less than 47.4 L/minute (12.5 gallons/minute) or a pressure of 6,900
kPa (1,000 psi) cannot be obtained:
A. The transmission bypass valve(s) may be open or damaged.
B. The traction control assembly may need adjustment (e.g., traction pedal
not rotating the pump swash plate fully).
C. If the engine speed drops excessively as the tester flow control valve is
closed, the engine performance should be evaluated.
IMPORTANT
48).
Page 4–50
Jacking
(Figure
Pump Outlet
Port A
Port C
(Figure 47 or Figure
position.
ORWARD
EUTRAL
Groundsmaster 360
16225SL Rev C