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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 

 

10

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% decrease in the ground speed 
making the controls less sensitive.  After stopping 
the engine, the adjustment is made by removing rod 
ends connected to the control rods from the current 
holes in the control levers and reinstalling them 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.  You 
must then perform the Tracking Adjustment 
described below. 
 

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.  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. 
 
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.  See previous 
section.  Before changing the length of the control 
rods 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 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 left) or the right side needs to go 
slower (by shortening the upper control rod on the 
right).  If the mower is tracking to the right, either the 
right side needs to go faster (by lengthening the 
upper control rod on the right) or the left side needs 
to go slower (by shortening the upper control rod on 
the left). 
 
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. After getting the mower to track straight, 
readjust the neutral adjustment , if necessary.  It is 
normal to need to make these adjustments from time 
to time as the linkage breaks in or wears. 
 

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 of 
discharge.  The discharge chute deflector should be 
in the down position.  The parking brake should now 
be applied.  Move the engine throttle to ¾ speed 
setting.  (When mowing, the engine speed should 
always be at its highest setting.  The engine governor 
will regulate the engine according to the different 
mowing conditions at that setting.)  Place both feet 
firmly on the foot platform and turn on the blade 
clutch switch.  Run blades for a minute or so.  Try 
engaging and disengaging the blades a few times