Toro Groundsmaster 3280-D Service Manual page 148

Test Procedure (continued)
Hydraulic System: Testing the Hydraulic System
9. Use the hydraulic hose kit to connect tester to the machine; refer to
Hose Kit (page 5–40). Ensure that the fitting and hose connections are
properly tightened. Also, ensure that the flow control valve on tester is fully
open.
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.
10. 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.
11. With the engine running, move the throttle to full speed (3,100 to 3,250 rpm)
position. Use a tachometer to check that the engine speed is correct.
12. Verify the pump flow at No Load as follows:
A. Slowly press the traction pedal to fully forward position.
B. Record the tester pressure and flow readings at no load. Unrestricted
pump output should be approximately 62 L/minute (16.3 gallons/minute)
at 8,963 kPa (1,300 psi).
13. Verify the pump flow Under Load as follows:
A. Slowly press the traction pedal to fully forward position, and keep the
pedal pressed in the forward position.
B. Apply an additional load of 8,963 to 13,100 kPa (1,300 to 1,900 psi) by
slowly closing the flow meter. The flow meter pressure gauge should
read 16,545 to 20,000 kPa (2,400 to 2,900 psi).
C. Record the tester pressure and flow readings under load.
14. Verify the traction relief valve operation as follows:
A. Return the traction pedal to the N
B. Fully close the flow meter flow control valve.
C. Slowly set the traction pedal to full forward position.
D. Record the tester pressure reading.
The system pressure should reach 32,400 to 33,100 kPa (4,700 to 4,800
psi) before the relief valve opens.
Note: The relief valve setting is 32,500 kPa (4,713 psi). An additional
690 to 1,030 kPa (100 to 200 psi) is necessary to overcome system
charge pressure before the relief valve opens.
E. Release the traction pedal, open the flow control valve fully, move the
throttle to low speed, and shut off the engine.
15. If the relief pressure can not be met or is greater than specified, the traction
relief valve is damaged and should be replaced.
16. The under load test flow reading (step 13C) should not drop more than 12%
when compared to the no load test flow reading (step 12B). A difference
of more than 12% may indicate the hydraulic pump is worn and should be
repaired or replaced.
17. After you complete the testing, disconnect the tester and connect the hose to
the pump fitting.
CAUTION
EUTRAL
Page 5–64
Hydraulic
position.
Groundsmaster ® 3280-D/3320
05138SL Rev B