Wright Serial # 55138 and higher - Manual (Page 23)

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WARNING 5.9 How to Perform the Tracking Adjustments
First ensure that the tire pressure is equal on both rear drive tires. Drive the mower on a level parking lot
with engine at full throttle. Check that the mower drives in a straight line when both hand controls are held
to the full speed position which is up against the stationary control bar. If not, park the mower and stop the
engine. Before proceeding to adjusting the mower tracking, check and make sure both controls move freely
through the forward and reverse range. Make sure that debris has not hindered the movement of the upper
and lower control rods and linkages. If all control linkages move freely and mower tracking is off, proceed to
the next step.
5.9.1 Tracking in the 10 & 12 MPH Setting
It is essential to start with the lower (and shorter) control rods located near the pumps. With the control
levers in the neutral position, the right and left lower control rod should be adjusted to allow their respective
torsion bar to remain level at the end connected to the lower control rod. Specifically, with the pump in the
Return-To-Neutral position, the lower rod end should be the same height as the rigidly fixed ball joint
connected on the same end of the torsion rod. NOTE: This adjustment may not be necessary if tracking is
slightly off. Upper control rods should be the only adjustment required. Perform this adjustment on both the
right and left side. Now that the lower end of both torsion rods are set, proceed to the upper control rods
connected to the control levers.
Loosen the jam nuts on both ends of the upper control rod. Note: the Speed Sensitivity setting on both
sides should be set together in the middle hole (factory) position. Rotate control rod to either lengthen or
shorten. So, if the mower is tracking to the left, either the left side needs to go faster (by lengthening the
upper control rod on the right) or the right side needs to go slower (by shortening the upper control rod on
the left). If the mower is tracking to the right, either the right side needs to go faster (by lengthening the
upper control rod on the left) or the left side needs to go slower (by shortening the upper control rod on the
right).
5.9.2 Tracking in the 13.5 MPH Setting
It is essential to start with the lower (and shorter) control rods located near the pumps. With the control
levers in the neutral position, the right and left lower control rod should be adjusted to allow their respective
torsion bar to remain level at the end connected to the lower control rod. Specifically, with the pump in the
Return-To-Neutral position, the lower rod end should be at the same height as the rigidly fixed ball joint
connected on the same end of the torsion rod. Perform this adjustment on both the right and left side. Now
that the lower end of both torsion rods are level, proceed to the upper control rods connected to the control
levers.
Loosen the jam nuts on both ends of the upper control rod. Note: the Speed Sensitivity setting should be set
to the fast position. Before changing the length of the control rods several facts are important to know.
In the faster Speed/Sensitivity setting neither control rod should be shortened so much that at full speed it
pulls the pump control lever (on the sides of the pumps) against the pump’s internal stop. The pumps have
an internal stop that is not designed to take this type of force and could eventually cause pump leakage or
other damage to the pump. Therefore, to reach the maximum capable speed, the rods should be lengthened
one turn at a time until you can feel in the hand control that the internal stop has been contacted with the
control handles in the maximum forward position. Then shorten the cable one turn. This will enable the
stationary bar to stop the control handle and protect the internal pump stop from damage. Remember, this
procedure does not apply if the Speed/Sensitivity Adjustment is in the slower setting.
So, if the mower is tracking to the left, either the left side needs to go faster (by lengthening the upper control
rod on the right) or the right side needs to go slower (by shortening the upper control rod on the left). If the
mower is tracking to the right, either the right side needs to go faster (by lengthening the upper control rod on
the left) or the left side needs to go slower (by shortening the upper control rod on the right).
The only reference point to limit the adjustment from becoming extremely off is the relative position of the
pump internal stop and the stationary bar in the faster Speed/Sensitivity setting. Therefore, if everything is