Walker R21 User Manual

Service R21
58
Straight Tracking Adjustment
1. Move the FSC to the full FORWARD speed
position.
2. Raise the seat panel. The maximum speed
adjustment set screw in both transmission
control arms should not be contacting the limit
stud on the transaxle. If they are, back the set
screws out until they do not touch. Lower the
seat panel.
3. Sit in the seat, start the engine, and set the
throttle at full speed. With the FSC in the
NEUTRAL-PARK po sition, check for move-
ment of either drive wheel. If either wheel
moves backward or forward, perform the
“Neutral Function Adjustment” on page 57.
4. Check for straight ground tracking on a level
surface (with hands off the steering levers).
Set the FSC at several different speeds and
ob serve if the machine moves in a straight line
using a cement joint or other line on ground
for refer ence.
5. If tracking is not straight, shorten the control
rod on the faster side by turning the tracking
adjustment nut of that side clockwise using 1/2
in. (13mm) wrench.
Tracking Adjust-
ment Nuts
Tracking Adjustment Nuts
NOTE: If tracking issues only occur at maxi-
mum speed, proceed to the next step.
□ If straight tracking and neutral are both
achieved, the adjustment is complete.
□ If straight tracking and neutral cannot both
be achieved, turn the tracking adjustment
nut on the faster side counterclockwise
until neutral is restored. Lengthen the con-
trol rod on the slower side by turning the
tracking adjustment nut counterclockwise
until straight tracking and neutral are both
achieved.
IMPORTANT: After tracking adjustments are
complete, conrm that there is at least one (1)
thread visible on both control rods past the
tracking adjustment nuts.
6. If the machine is tracking straight throughout
the speed range except at maximum speed,
complete the following maximum speed track-
ing adjustment:
1. With the engine off, place the FSC in full
FORWARD. On the faster transmission,
loosen the jam nut on the maximum speed
adjustment set screw using a 7/16 in. (11
mm) wrench. Using a 1/8 in. hex wrench
turn the maximum speed adjustment set
screw clockwise until it just contacts the
limit stud and then turn it an additional 1/8
turn. (Turning the set screw in or clock-
wise slows the drive wheel.) Tighten the
jam nut. Refer to “Tracking Adjustment
Components” on page 57 for details in
locating the set screw.
2. Recheck maximum speed tracking, and
if necessary continue adjusting the set
screw in small increments until straight
travel is achieved.

Walker R21 Specifications

General

Drive System	Hydrostatic
Cutting Height	1.5 - 4.5 inches
Engine	Kohler CH740
Engine Type	Air-cooled
Cutting Width	52 inch
Wheel Size	20 inches (rear)