Section E - Hydraulics
Fault Finding
Hydrostatic Transmission
E - 38 E - 38
9803-9450-2
Transmission Pump Neutral Adjustment
This procedure may be carried out if the machine creeps
when the drive control is in the neutral position.
This fault may be due to an incorrect neutral setting of the
servo piston.
1 Identify which pump section requires adjustment.
If the machine veers to the left this could be caused
by either the right hand wheels moving forward or the
left hand wheels moving in reverse. Remember that
pump P1 drives the left hand motor and pump P2
drives the right hand motor K
Fig 29. ( T E-39).
If the machine moves either straight ahead or behind
then both pump servos must be adjusted equally.
2 Stop the engine.
3 Remove the seat, seat base and pump cover.
4 If pump P1 requires adjusting, loosen locknut A and
turn the ‘neutral’ adjusting screw B 1/10 of a turn in
the required direction then re-tighten the locknut.
If pump P2 is to be adjusted, loosen locknut C and
turn adjusting screw D.
If the wheels are creeping forward, turn the adjusting
screws in an anti-clockwise direction (out). If the
wheels are creeping in reverse, turn the screws
clockwise (in).
Note: This adjustment is very sensitive. Turn the
adjusting screw 1/10 of a turn at a time and re-check. A
slight movement when the wheels are raised is acceptable
provided that no movement occurs when the machine is
resting on the ground.
5 Start the engine and check that the wheels are
stationary.
6 Finally tighten locknuts A and C taking care to retain
the set position of adjusting screws.
7 Re-check for wheel movement.
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