Toro Groundsmaster 4300-D Service Manual page 119

Test Procedure (continued)
Groundsmaster ® 4300-D
16226SL Rev C
Ensure that the fluid flow indicator arrow on the flow meter is
showing that the fluid will flow from the pump, through the tester,
and into the disconnected hydraulic hose.
7. Install a tester with the pressure gauge and flow meter in series between the
traction pump fitting and the disconnected hose.
8. Use the hydraulic hose kit to connect tester to the machine; refer to
Tools (page 4–31). 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.
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.
10. 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.
11. 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 106 L/minute (28 gallons/minute)
at 6,900 kPa (1,000 psi).
12. 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 6,900 to 10,340 kPa (1,000 to 1,500 psi) by
slowly closing the flow meter. The flow meter pressure gauge should
read 13,800 to 17,500 kPa (2,000 to 2,500 psi).
C. Record the tester pressure and flow readings under load.
13. 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 26,200 to 26,545 kPa (3,800 to 3,850
psi) before the relief valve opens.
Note: The relief valve setting is 25,000 kPa (3,625 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, press the
engine speed switch to low speed, and shut off the engine.
IMPORTANT
CAUTION
EUTRAL
Page 4–57 Hydraulic System: Testing the Hydraulic System
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