Wright Serial 54956 and higher - Manual (Page 21)

21
Slow Hole
Fast Hole
5.8 Changing the Speed/Sensitivity Adjustment
The controls are initially set with the Speed/Sensitivity Adjustment
in the faster, more sensitive position. If an operator is not
completely familiar with the mower operation the operator may
desire to decrease the ground speed. The slower setting has a
corresponding decrease in the sensitivity of the controls. In other
words, a given amount of movement of the control levers will
cause about a 25-30% change in the ground speed making the
controls less sensitive. After stopping the engine, the
adjustment is made by removing the bolts that hold the control
rods onto the control lever from the current holes in the control
levers and reinstalling them and the rods into the alternate holes.
BE SURE THE BOLTS IN THE CONTROL RODS ARE
SECURELY IN PLACE EACH TIME YOU REMOVE THEM. You must then perform the Tracking
Adjustment described below.
5.9 How to Perform the Tracking Adjustment
First ensure that the tire pressure is equal on both rear drive tires (18-22 psi). Drive the mower on a
level parking lot with the engine at full throttle. Check that the mower drives in a straight line when both
hand controls are held to the full speed position. If not, park the mower and stop the engine. The
adjustment is made by loosening the jam-nuts on the control rods (this may need to be done to one or
both control rods) and adjusting the control rods. Once the jam-nuts are loosened at the top and bottom
of the control rod proceed to turning the control rod clockwise or counter-clockwise. Turning the control
rod clockwise will shorten the control rod and increase the forward movement of the mower on that side.
Turning the control rod counter-clockwise will lengthen the control rod and decrease the speed of the
forward movement of the mower on that side.
In the “faster” Speed/Sensitivity setting (this is the factory setting) neither rod should be lengthened so
much that at full speed it pulls the pump control lever (on the sides of the pumps) against the internal
pump stop. 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 pump stop has been contacted. Then
shorten the rod one turn (damage to the hydro pump will occur if the controls are adjusted in a way that
put direct pressure on the internal pump stop). You will feel the slight resistance. There is no need to
start the engine while checking this incrementally. Remember, this procedure does not apply if the
Speed/ Sensitivity Adjustment is in the slower setting. Otherwise you will wind the swivels way up the
rods and the mower will go faster but will lose most or all of its reverse capability and then the gap
between the handlebar and the control levers becomes excessive when at the neutral position.
If the rod is made longer it will decrease the forward speed capability for that side of the mower and if
the rod is made shorter it will speed up that side of the mower. So, if the mower is tracking to the left,
either the left side needs to go faster (by shortening the left-side rod) or the right side needs to go slower
(by lengthening the right-side rod). If the mower is tracking to the right, either the right side needs to go
faster (by shortening the right-side rod) or the left side needs to go slower (by lengthening the left-side
rod). It is important that neither rod should be lengthened too far, as mentioned above.
The only reference point to limit the adjustment from becoming extremely off is the relative position of
the pump stop and the handlebar in the faster Speed/Sensitivity setting. Therefore, if everything is way
off either because you are installing new parts (or other reasons) you should only use the faster Speed/
Sensitivity setting to get the tracking accurate and then change to the slower speed range and adjust the
tracking only one or two turns on either side.
After getting the mower to track straight, readjust the neutral adjustment on the pump by using a ¼”
allen wrench at the Return-to-Neutral (RTN) mechanism, if necessary. It is normal to make these
adjustments from time to time.