Simplicity ZT4000 Series - Manual (Page 34)

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Regular Maintenance
Figure 34. Neutral Return Spring Adjustment
A. Rear Set Collar
B. Neutral Return Rod
C. Neutral Return Spring
D. Front Set Collar
E. Neutral Return Bushing
F. Spring Stop Plate
A
C
E
F B
Neutral Adjustment
If the tractor “creeps” while the ground speed control levers
are locked in NEUTRAL, then it may be necessary to adjust
the linkage rod.
NOTE: Perform this adjustment on a hard, level surface such
as a concrete floor.
1. Disengage the PTO, engage the parking brake and turn
off the engine.
2. The locking nuts (D, Figure 33) are to be used together
to turn the rod. Loosen the jam nut that locks against
the ball joint (B) and turn the linkage rod (A) to adjust.
If the machine creeps forward, turn the rod CLOCKWISE
(while standing at the rear of the machine, facing
forward), if the machine creeps backward, turn the rod
COUNTER-CLOCKWISE.
3. Lock the jam nut (B) against the ball joint (C) when
neutral is achieved.
NOTE: This adjustment should not be performed while the
machine is running. It may take several attempts to achieved
neutral, depending upon how much the machine creeps.
Return-to-Neutral Adjustment
To determine if it is necessary to adjust the neutral return,
perform the following steps.
1. Disengage the PTO, engage the parking brake and turn
off the engine.
2. Move the ground speed control levers into the operating
position, pull levers rearward and release.
3. Move the ground speed control levers out towards the
neutral position. If the levers do not align with the
notches in the neutral lock plate, it is necessary to adjust
the neutral return rod.
To Adjust:
1. Lock the ground speed control lever in the neutral
position.
2. Measure the length of the neutral return spring (C,
Figure 34) it should be set at 3.25” (8,23cm). If the
spring does not measure 3.25” (8,23cm) loosen the
front set collar (D) and the rear set collar (A), then move
the front set collar forward or back on the neutral return
rod (B) until the spring length equals 3.25” (8,23cm).
Retighten the front set collar.
3. Make sure that the neutral return bushing (E) is seated
correctly in the spring stop plate (F).
4. Position the rear set collar so that it sets tightly against
neutral return bushing and tighten.
5. Pull the ground speed control lever rearward and release
to check position again. Adjust as necessary to align
the ground speed control levers with the notches in the
neutral lock plate.
It is important to note that after every adjustment of the
neutral return rod, the lever must be pulled rearward and
released to properly check the neutral position.
Figure 33. Neutral Adjustment (RH side shown)
A. Adjustment Linkage Rod
B. Jam Nut
C. Ball Joint
D. Locking Nuts
A
B
D
D
3.25”
(8.23cm)