Wright Manufacturing Sentar Commercial Mower - Manual (Page 13)

How to Change 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 mower
operation the
operator may desire
to decrease
the ground speed approximately 25-30%. 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 pins that
hold the control cables onto the control lever
from the current holes in the control levers and
reinstalling them and the cable into the
alternate holes. The top holes closest to the
control handles are for the faster, more
sensitive setting and the bottom holes farthest
from the control handles are the slower, less
sensitive setting. BE SURE THE PINS IN THE
CONTROL CABLES ARE SECURELY IN
PLACE AND LATCHED ONTO THE CABLE
YOKE EACH TIME YOU REMOVE THEM.
YOU MUST USE NEW PINS IF THE OLD
ONES ARE WORN, BROKEN, OR BENT. 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 and equal on both front
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. The
adjustment is made by removing the pin from
one of the ends of the control cables and
screwing the cable yoke to either make the
control cable longer or shorter. Either end of
the cable can be adjusted. Before changing the
length of the cables several facts are important
to know.
In the faster Speed/Sensitivity setting neither
cable 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 cables should be
shortened one turn at a time until you can feel
in the hand control that the internal stop has
been contacted. Then lengthen the cable one
turn. You will feel the slight resistance. There
is no need to start the engine or even replace
the pin while checking this incrementally. Just
put the cable yoke pin in the hole in the lever
and test it by squeezing the handle to full fast
position). Remember, this procedure does not
apply if the Speed/Sensitivity Adjustment is in
the slower setting. Otherwise you will run out of
threads on the cable ends and the mower will
go faster but will lose most or all of its reverse
capability. Then gap between the stationary
bar and the control levers becomes excessive
when at the neutral position.
So, if the mower is tracking to the left, either the
left side needs to go faster (by lengthening the
cable) or the right side needs to go slower (by
shortening the cable). If the mower is tracking
to the right, either the right side needs to go
faster (by lengthening the cable) or the left side
needs to go slower (by shortening the cable). It
is important that neither cable 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 internal stop and the
stationary bar in the faster Speed/Sensitivity
setting. Therefore, if everything is extremely off
either because you are installing new parts or
other reasons you should only use the faster
Speed/ Sensitivity setting to get the tracking to
be accurate and then change to the slower
speed range and adjust the tracking only one or
two turns on either side. BE SURE THE PINS
IN THE CABLE YOKES ARE SECURELY
REPLACED EACH TIME YOU REMOVE
THEM. YOU MUST USE NEW PINS IF THE