Priming The Hydraulic Pumps - Toro Greensmaster 3120 Service Manual

Filtering the Closed-Loop Traction Circuit (continued)

Priming the Hydraulic Pumps

Hydraulic System: Service and Repairs
6. Fill the hydraulic tank with the correct type and quantity of new hydraulic
fluid; refer to the traction unit Operator's Manual.
7. Start engine and run at low idle speed. Check for and correct any hydraulic
leaks before proceeding.
Use extreme caution when performing this test. The traction unit
wheels will be rotating during the test.
While engaging the traction circuit, monitor the indicator on the high
flow hydraulic filter. If the indicator should show red, either reduce
pressure on the traction pedal or reduce engine speed to decrease
hydraulic flow through the filter.
8. With 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 traction circuit engaged for five (5) minutes while gradually increasing
both forward pressure on traction pedal and engine speed. Monitor filter
indicator to make sure that green color is showing during operation.
If using a hydraulic filter that is not bidirectional, do not press the
traction pedal in the reverse direction. If flow is reversed when using
a filter that is not bidirectional, debris from the filter will re-enter
the traction circuit.
9. With a bidirectional hydraulic filter installed and the engine running at high
idle speed, alternately move traction pedal from forward to reverse. Continue
this process for an additional five (5) minutes while monitoring filter indicator.
10. Shut the engine OFF and remove the key from ignition switch.
11. Remove hydraulic filter from the machine and install disconnected hydraulic
hose/tube.
12. Lower machine to ground.
13. Check the hydraulic fluid level in the tank and adjust as necessary; refer to
the traction unit Operator's Manual.
14. Operate the machine and check for leaks before returning the machine to
service.
Whenever hydraulic fluid has been drained from the pumps (system drain, flush,
or pump removal/installation) it is important to properly prime the hydraulic
pumps. Priming the hydraulic pumps ensures that the gear pumps and piston
(traction) pump have sufficient fluid while charging the hydraulic system.
Use the following procedure to prime the hydraulic pumps:
CAUTION
IMPORTANT
IMPORTANT
Page 4–78 Greensmaster 3120
17230SL Rev C