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this time. If the mower is moving forward or
rearward, the neutral setting must be adjusted. The
hydraulic pump has a Return-to-Neutral (RTN)
device built into the linkage of the pump. Before
adjusting neutral, it is necessary to lift the rear drive
wheels off the ground using a jack and stands. To
make the adjustment, loosen the ¼” Allen bolt and
rotate the RTN device on the pump corresponding
to the wheel that needs adjustment. If the right
wheel turns in the neutral position, then the right
pump RTN needs to be adjusted. The RTN
mechanism should be rotated until the neutral
position is found and then retighten the ¼” allen
bolt. Use care not to over tighten the allen bolt.
Repeat the procedure on the other pump if
necessary.
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 rod ends from the
current holes in the control system torsion bar and
reinstalling them into the alternate holes. The holes
closest to the operator position are for the slower, less
sensitive setting and the holes farthest from the
operators position are the faster, more sensitive setting.
You must then perform the Tracking Adjustment
described below.
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. Shortening the control rod will increase
the speed of the forward movement of the mower
on that side. Lengthening the control rod will slow
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.
If the rod is made shorter it will increase the
forward speed capability for that side of the mower
and if the rod is made longer it will slow down 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 shortened 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, check
and/or 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.
How to Test/Use the Blade Clutch/Brake
Switch
Before testing the blade clutch/brake operation,
make sure the area is clear and there is nothing
vulnerable to thrown objects from under the mower.
No one should be near the mower deck or in its line
Front
Slow setting