Toro Groundsmaster 4300-D Service Manual page 138

Test Procedure (continued)
Hydraulic System: Testing the Hydraulic System
3. Lift and support the operator seat to get access to the hydraulic pump
assembly.
1. Gear pump (P3)
4. Clean both ends of the hydraulic tube that connects the charge filter outlet
with the traction pump
tube and remove it from the machine. Plug both ends of the removed
hydraulic tube to prevent system contamination.
Ensure that the fluid flow indicator arrow on the flow meter is
showing that the fluid will flow from the hydraulic tube, through the
tester, and into the traction pump.
5. Install a tester with the pressure gauge and flow meter in place of the
removed hydraulic tube. Connect the tester inlet hose to the charge filter
fitting and outlet hose to the traction pump fitting. Ensure that the flow control
valve on the tester is fully open.
6. Ensure that the hydraulic fluid is at normal operating temperature by
operating the machine for at least 10 minutes.
7. Ensure that the traction pedal is in the N
stationary, and parking brake is set.
8. Start the engine and run it at low-idle speed (1,175 to 1,225 rpm). Check for
hydraulic-fluid leaks from the test connections and correct before continuing
the test.
9. 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.
10. Verify the pump flow at No Load as follows:
Record the tester pressure and flow readings at no load. Unrestricted pump
output should be approximately 18.5 L/minute (4.9 gallons/minute).
Figure 72
2. Hydraulic tube
(Figure 72). Disconnect both ends of the hydraulic
IMPORTANT
EUTRAL
Page 4–76
position, steering wheel is
Groundsmaster ®
16226SL Rev C
4300-D