Toro Groundsmaster 4300-D Service Manual page 126

Test Procedure (continued)
Hydraulic System: Testing the Hydraulic System
7. For the deck motor that is to be tested, clean the junction of the hydraulic
return hose and deck motor fitting at the motor outlet
8. Disconnect the return hose from the motor, install a tester with the pressure
gauge and flow meter in series with the motor and disconnected return hose.
Ensure that the flow control valve on tester is fully open.
Note: Use a graduated container, the special tool TOR4077, to measure
the case drain leakage
9. Start the engine and run it at low-idle speed. Check for hydraulic-fluid leaks
from the test connections and correct before continuing the test.
The cutting deck blades will rotate when you perform the motor
efficiency test. Keep away from the cutting decks during the test
to prevent personal injury from the rotating blades. Do not stand
in front of the machine.
Note: This test requires 2 people (one in the seat and one at the cutting
deck motor).
10. Sit on the seat with the engine running, press the engine speed switch to full
speed (3,005 to 3,055 rpm) position. Use the InfoCenter to check that the
engine speed is correct. Press the PTO switch to O
the cutting decks.
11. Monitor the tester pressure gauge carefully while you slowly close the flow
control valve until a pressure of 13,800 kPa (2,000 psi) is obtained.
12. Have an assistant place the disconnected motor case drain hose into a
container graduated in ounces or milliliters (Toro Part No. TOR4077) and
collect the hydraulic fluid for 10 seconds.
13. After 10 seconds, remove the hose end from the container, and then move
the PTO switch to O
off the engine.
14. Identify the amount of fluid collected in the container. Record the test results.
If the flow was greater than 739 ml (25 fl oz) and 4.5 L/minute (1.18
gallons/minute), repair or replace the tested deck motor; refer to
the Cutting Deck Motor (page
15. After you complete the testing, shut off the engine. Disconnect the tester
from the motor and return hose.
16. Connect the return hose to the deck motor, remove the plug from the machine
bulkhead fitting, and connect the case drain hose to the fitting.
17. If necessary, perform the motor efficiency test on the other deck motors.
When testing more than one cutting unit motor, check and adjust the
hydraulic-fluid level in the tank after testing each motor.
18. When testing is complete, start the engine, check for hydraulic-fluid leaks,
repair any leaks as required, and fill the hydraulic tank with the correct
quantity of new hydraulic fluid before returning the machine to service.
(Figure 63).
CAUTION
position, open the tester flow control valve, and shut
FF
4–134).
IMPORTANT
Page 4–64
(Figure 64).
position, and engage
N
Servicing
Groundsmaster ® 4300-D
16226SL Rev C