Toro Groundsmaster 4300-D Service Manual page 154

Filtering the Closed-Loop Traction Circuit (continued)
Hydraulic System: Service and Repairs
Before lifting the machine with a jack, review and follow
Instructions (page 1–6).
2. Lift and support the machine so that all the wheels are off the ground.
Note: If the wheel motor was replaced, install a high-flow filter to the inlet of
the new motor instead of to the traction pump fitting. This will prevent system
contamination from entering and damaging the new wheel motor.
3. Clean the junction of the hydraulic hose and left elbow fitting at the bottom of
the traction pump (Figure
4. Connect the Toro high flow hydraulic filter in series between the traction
pump fitting and disconnected hose. Use the hydraulic hose kit (refer to
Special Tools (page
the fitting and hose connections are properly tightened.
Using other hydraulic fluids could damage the hydraulic system.
Use the hydraulic fluids that are specified in the Operator's Manual.
5. After you install the high-flow filter to the machine, check and fill the hydraulic
tank with the correct quantity of new hydraulic fluid.
6. Start the engine and run it at low-idle speed (1,175 to 1,225 rpm). Check
for hydraulic-fluid leaks at the filter and hose connections. Correct any leaks
before you proceed.
During this procedure, all the wheels will be off the ground and
rotating.
Ensure that the machine is well supported so it will not move and
accidentally fall to prevent injuring anyone around the machine.
While engaging the traction circuit, monitor the indicator on the
high flow hydraulic filter. If the indicator shows red, either reduce
the pressure on the traction pedal or reduce the engine speed to
decrease the hydraulic flow through the filter.
7. With the engine running at low-idle speed, slowly move the traction pedal to
the forward direction to allow flow through the traction circuit and high-flow
filter. Keep the traction circuit engaged in forward for 5 minutes while
gradually increasing both forward pressure on the traction pedal and engine
speed. Monitor the filter indicator to ensure that the green color is showing
during operation.
IMPORTANT
80). Disconnect the hose from the left pump fitting.
4–31)) to connect the filter to the machine. Ensure that
IMPORTANT
CAUTION
IMPORTANT
Page 4–92
Jacking
Groundsmaster ® 4300-D
16226SL Rev C