Toro Groundsmaster 5900 Series Service Manual page 180

Charge Hydraulic System (continued)
Hydraulic System: Service and Repairs
9. After the hydraulic system starts to show signs of fill, actuate a lift switch until
the lift cylinder rod moves in and out several times. If the lift cylinder does not
move after ten (10) to fifteen (15) seconds, or if the pump emits abnormal
sounds, shut the engine off immediately and determine cause or problem.
Inspect for the following:
A. Loose filter or suction lines.
B. Blocked suction line.
C. Faulty charge relief valve.
D. Faulty gear pump.
10. Once the lift cylinder does move in ten (10) to fifteen (15) seconds, proceed
to next step.
11. Set the traction speed range to LOW. With the engine at low idle speed,
move the traction pedal to about 1/2 forward speed and hold for 30 seconds.
Both unlocked wheels should turn in the forward direction smoothly.
Note: If the wheels rotate in the wrong direction, stop engine and check
for proper hydraulic hose and electrical connections at traction pump and
motors. Correct as needed.
12. Move the traction pedal to about 1/2 reverse speed and hold for 30 seconds.
Both unlocked wheels should turn in the reverse direction smoothly.
13. Remove the wheel clamps or locks from the machine.
14. Safely clamp or lock the front right and rear left wheels to prevent them from
rotating.
15. Repeat step 11 and 12.
16. Remove the wheel clamps or locks from the machine.
17. Set the traction speed range to HIGH. With the engine at low idle speed,
move the traction pedal to about 1/2 forward speed and hold for 30 seconds.
Both front wheels should turn in the forward direction smoothly. The rear
wheels should not rotate.
Note: If the rear wheels rotate, solenoid valve SV or pressure differential
valve PD1 in the traction manifold may not be shifting.
18. Move the traction pedal to about 1/2 reverse speed and hold for 30 seconds.
Both front wheels should turn in the reverse direction smoothly. The rear
wheels should not rotate.
19. Check operation of the traction system interlock switches (see
Operation of Interlock Switches (page
20. If the piston (traction) pump or a traction motor was replaced or rebuilt, run
the machine so all wheels turn slowly for ten (10) minutes.
21. Stop the engine and set the key switch to the OFF position. Remove the jack
stands and lower the machine to the ground.
22. Check hydraulic reservoir and fill if necessary. Check hydraulic components
for leaks and tighten any loose connections.
23. Operate machine by gradually increasing its work load to full over a ten (10)
minute period.
6–45)).
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Check
Groundsmaster ® 5900 & 5910
16227SL Rev B