Testing - Toro Groundsmaster 300 Series Service Manual

Testing

Steering Valve Test
Using Hydraulic Tester With Flow Meter
1. Engage the parking brake and block the front wheels
to prevent movement of the machine. Lower the cutting
unit or implement to the floor and turn the engine OFF.
2. Disconnect the hydraulic hose at the charge pump
outlet (pressure) fitting.
3. Connect the inlet hose of the tester to the hydraulic
fitting on the transmission and the outlet hose of the
tester to hose that was disconnected in step 2.
IMPORTANT: Make sure that the oil flow indicator
arrow on the flow gauge is showing that the oil will
flow through the tester from the charge pump to the
steering valve.
4. Make sure that the tester load valve is fully open
(counterclockwise). Start the engine and allow it to run
for approximately 5 minutes so that the hydraulic oil
reaches normal operating temperature.
5. With the tester load valve fully open (counterclock-
wise) run the engine at full throttle.
6. Turn the steering wheel all the way to the right
(clockwise) and hold it against the right stop. Look at the
flow meter. There should be no flow as the steering
wheel is held against the right stop. Flow should be
approximately 3 gpm when the steering wheel is re-
leased. Repeat this procedure with the steering wheel
all the way to the left (counterclockwise). If flow does not
return to approximately 3 gpm when the steering wheel
is released the control valve within the steering valve
may be sticking.
If a Hydraulic Tester is Not Available:
1. Engage the parking brake.
2. Run the engine at full throttle.
3. Turn the steering wheel all the way to the right
(clockwise) and hold it against the stop. Pull the lift
control lever back to raise the implement while holding
the steering wheel against the stop. The implement
should NOT raise until the steering wheel is released.
Repeat this procedure with the steering wheel turned all
the way to the left (counterclockwise). If the implement
raises slowly, or not at all when the steering wheel is
released, the control valve within the steering valve may
by sticking. When turning the steering wheel, the wheels
must move from stop to stop. The wheels must move
smoothly in both directions.
®
Groundsmaster 300 Series
(Control Valve Section)
Page 8 - 7
Figure 7
1. Transmission
2. Tester
3. Load valve
Testing