425HD-MD INITIAL SETUP
Hydraulic Pump Adjustment
425HD-MD INITIAL SETUP 425HD-MD/masterdoc101602 3-9
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3.10 Hydraulic Pump Adjustment
Occasionally, you may need to adjust the hydraulic pumps to keep the drive wheels from
creeping. Follow these procedures to adjust the pumps:
1. Lift the rear of the drive unit until the drive tires clear the ground. Use jack stands for
safety.
2. Be sure steering control arms are locked in neutral position.
3. Start the drive unit, and set the throttle arm to 3/4 full.
4. If either drive tire rotates, you need to adjust the hydraulic pump link arm for that tire. (The
link arm is attached to the bottom of the steering control arm). To adjust the link arm,
loosen the jam nut from the hydraulic pump link arm. (The jam nut is located between the
rod end and the link arm). Slowly turn the link arm, watching the tire as it turns. If the tire
begins turning faster, turn the link arm in the opposite direction until it slows, and eventu-
ally stops. Tighten the jam nut to lock the link arm into this position.
5. When finished, turn off the drive unit.
6. Be sure that both link arm jam nuts are tight.
7. Lift the drive unit, remove the jack stands, and lower the unit to the ground.
3.11 Towing (Hydraulic Pump Adjustment)
When towing the articulator, it is necessary to make minor adjustments to both of the
hydraulic pumps. This will allow the hydraulic to freewill. Please follow the instructions
below for the proper procedure:
1. Locate the hydraulic pump valve. This will be locate on the side of each pump.
2. Turn the valves no more than (2)two turns in a counterclockwise motion. The drive tires
should rotate freely.
3. Tow the unit to the desired destination.
4. When towing in completed, return the valves to there original position by turning them in a
clockwise motion until they are tight.
Always use jack stands when adjusting the hydro pumps!
Keep everyone clear of all controls while adjusting the hydro pumps!
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