R21 Service
57
Neutral Function Adjustment
1. Securely block up tractor so the drive tires
are a couple inches off the ground. The deck
should remain attached.
2. Raise the seat panel. Adjust the tracking ad-
justment nuts at the front of both control rods
so that 2 or 3 threads are visible, then loosen
the jam nuts on the ball joints at the back of
the control rods.
Control Arms
Control Rods
Tracking Adjustment Nuts
Transmission Control Rod and Arm Location
(Shown with Parts Removed for Clarity)
WARNING
The following adjustments are made with the
engine running. Keep all body parts and tools
away from rotating and hot components, and
secure all loose clothing.
3. With the seat panel lowered and the FSC in
NEUTRAL-PARK, start the engine. With the
engine at normal operating speed, check for
movement of the drive wheels.
4. Raise the seat panel. Using a wrench on one
tracking adjustment nut, rotate the control rod
counterclockwise just until the wheel on that
side begins to move forward. Then, count-
ing the turns required, rotate the control rod
clockwise just until the wheel stops and then
begins to move in reverse. Rotate the con-
trol rod back counterclockwise half the number
of turns required to make the wheel go from
moving forward to reverse. The transmission
is now centered in the neutral window. Tight-
en the jam nut on the ball joint and repeat the
same procedure on the other transmission.
5. Turn off the engine, and then lower the drive
tires onto the ground.
REV
FWD
Tracking Adjust-
ment Nut
(Adjusts Length of
Control Rod)
Control Rod
Ball Joint
Jam Nut
Locating/Limit
Stud
Tracking Adjustment Components
Transmission
Control Arm
Maximum Speed
Adjustment Set Screw
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