23
Charging the Hydraulic System
Whenever a hydraulic component is repaired or replaced,
the hydraulic oil filter should be changed and the hydraulic
system charged.
Important Make sure that the hydraulic reservoir and
filter are filled with oil at all times when charging the
hydraulic system.
1. Park the machine on a level surface and turn the engine
off.
2. Pivot the seat upward and remove the engine shield.
3. Loosen the locknut on the spring adjusting pin until the
bearing moves freely from the cam on the lever
(Fig. 23), allowing the pump shaft freedom to rotate
during start-up.
1
2
3
Figure 23
1. Spring adjusting pin
2. Bearing
3. Cam
4. Raise one rear wheel off of the floor and place support
blocks under the frame.
5. Start the engine and set the throttle to allow the engine
to run at approximately 1800 RPM.
6. Actuate the lift valve lever until the lift cylinder rod
moves in and out several times. If the cylinder rod does
not move after 10–15 seconds or the pump emits
abnormal sounds, shut the engine off immediately and
determine the cause or problem. Inspect for the
following:
• Loose filter or suction lines
• Loose or faulty coupler on the pump
• Blocked suction line
• Faulty charge relief valve
• Faulty charge pump
If the cylinder moves in 10–15 seconds, proceed to
step 7.
Note: A hydrostatic transmission service manual (Bulletin
No. 9646) and a repair manual (Bulletin No. 9659) can be
obtained from:
Sundstrand Corporation
2800 East 13th Street
Ames, Iowa 50010
7. Operate the traction pedal in forward and reverse. The
wheel that is off of the floor should rotate in the proper
direction. If the wheel rotates in the wrong direction,
stop the engine, remove the lines from the rear of the
pump and reverse the locations. If the wheel rotates in
the proper direction, stop the engine and adjust the
spring adjusting pin locknut. Adjust the traction neutral
position; refer to Adjusting the Traction Drive for
Neutral, page 24.
8. Check the adjustment of the traction interlock switch;
refer to Adjusting the Traction Interlock Switch,
page 24.
9. Install the engine shield and lower the seat.
Adjusting the Steering Chain
Since the chain and sprocket are subjected to sand thrown
up by the front tire, inspect them frequently for wear. If
either the chain or sprocket is worn beyond acceptable
limits, both should be replaced.
1. Place the front wheel in the straight ahead position.
2. Adjust the locknuts until the chain is snug on both sides
of the sprocket (Fig. 24).
3. Turn the steering wheel full left and full right to be sure
that the chain does not bind or hang up in either
direction. Adjust as required.
1
Figure 24
1. Adjusting nuts
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