Steering Control Neutral Adjustment; T-Bar Control Lever Alignment; Check The Tires; Adjusting The Unit To Track Straight - Gravely Promaster 100 Service Manual

4.6 STEERING CONTROL NEUTRAL
ADJUSTMENT
If the unit has excessive creep when the twin T-bar
control levers are in neutral, adjust as follows. See
.
Figure 5
WARNING: This adjustment requires
operation of the engine and removal of
guards. Use extreme care to avoid contact
with moving parts and hot surfaces. Be sure
rear of unit is well supported and secure
before starting engine.
1. Stop the engine.
2. Make sure both twin T-bar control levers are in the
neutral detent. (This is important).
3. With the unit facing a wall, jack the unit up so that
both drive wheels are off the ground. (You may
want to remove the linkage guards). See Figure 5.
4. Loosen the two 1/4-20 hex bolts holding the neutral
adjustment weldment. Loosen the bolts just
enough so that the weldment can be rotated by
tapping on one of the bottom corners with a wrench
or small hammer.
5. Start the engine and run at about half throttle or
faster.
6. Tap on one bottom corner or the other of the
neutral adjustment weldment until the wheel stops
turning. Try to adjust neutral to the center of the
neutral band. Tighten the two 1/4-20 hex bolts.
7. Move the control levers, from forward to reverse
several times to make sure it is adjusted to neutral.
Readjust if necessary.
8. Stop the engine.
2
1. Speed Control Arm
2. Neutral Adjustment
Weldment
3. 1/4-20 Hex Bolts
4
5
1
3
4. Neutral Detent Strap
5. Linkage Guard
Figure 6

4.7 T-BAR CONTROL LEVER ALIGNMENT

Refer to Figure 7.
1. T-Bar Control Levers
2. 5/16-18 Bolts
1. Move the control levers to the neutral detent
position. Stop the engine.
2. Loosen the 5/16-18 bolt in the clamp at the base of
each control lever. (Loosen the bolts just enough
to rotate the control levers on their shaft with some
resistance).
3. Position the control levers in the desired location
and tighten the 5/16-18 bolt on each one.
4. Move the control levers forward and backward as
far as they will travel to check for interference in
the instrument panel slots. If there is interference,
readjust the neutral position.

4.8 CHECK THE TIRES

Before each use make a visual check of tires. The
correct air pressure is 12-15 psi (83-103 kN/m2) for the
rear tires and 20-25 psi (138-172 kN/m2) for the front
tires.
4.9 ADJUSTING THE UNIT TO TRACK
STRAIGHT
There are two main reasons the unit will not track
straight:
1. Orientation of the T-bar levers is not adjusted
identically relative to the hydraulic pump neutral
band. Each Sunstrand pump has a .031 inch
diameter orifice in both the forward and reverse
circuit; the neutral band has some width to it.
2. The tires vary in size and adjusting the air pressure
slightly can compensate for this.
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4 - 18
1
1
2
2
Figure 7
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