Walker MDD (20.9 HP) - Manual (Page 84)

Maintenance Instructions
ADJUSTMENTS
80
Steering Lever End Play Adjustment - Step 2
1. Position the FSC lever to the most FORWARD
position.
2. Loosen the adjustment nut on each steering le-
ver actuator until end play develops between
the lever actuator and the adjustment nut (slid-
ing on transmission control rod).
3. Hold the actuator back as shown (against the
spring pressure) and tighten the nut to the point
where the end play is removed and then tight-
en two additional turns.
IMPORTANT: If the adjustment nut is too
loose (end play exists) excessive loads are
placed on transmission internal control stops. If
the adjustment nut is too tight (preferred con-
dition), the maximum forward travel speed is re-
duced.
Neutral Function Adjustment - Step 3
1. Move the FSC lever to the NEUTRAL-PARK
position (rear travel limit).
2. Start the engine (operate first at idle and then
normal operating speeds) and check for
movement of the drive wheels.
NOTE: If the engine will not start, check and ad-
just the neutral safety switch (see item 4 below).
Neutral Function Adjustment
3. If drive wheels are moving, stop the engine and
adjust the FSC neutral stop by adjusting the
FSC actuator clevis (see Neutral Function Ad-
justment photo for clevis location). If the drive
wheels are moving backward, remove the cotter
pin and clevis pin and screw the clevis forward.
If the drive wheels are moving forward, screw
the clevis backward. Restart the engine and
check for wheel movement (several “trial and er-
ror” adjustments may be required). At this point
it may not be possible to adjust both wheels
stationary since the differential adjustment has
not been made. (This is covered by the Straight
Ground Travel Adjustment - Step 4.) In this
case, the neutral adjustment should be made for
one wheel stationary and the other moving for-
ward slightly.
4. Check and adjust the neutral safety switch
for closure and function with the FSC in neutral
(the engine will not start when the switch is
open). Use panel nuts on the switch body to
adjust switch position for closure in neutral. Re-
fer to adjustment description for Safety Switch-
es in this section.
Straight Ground Travel Adjustment - Step 4
1. Sit in the seat, start the engine (operate at nor-
mal speed), and with the FSC in the NEUTRAL-
PARK position check for forward movement of
either drive wheel (if either wheel moves back-
ward, refer back to Neutral Function Adjust-
ment - Step 3 and readjust). Tighten the
steering lever adjustment nut on the side of
the mower with the wheel moving forward
until wheel movement stops.
2. Check for straight ground track on a level sur-
face (with hands off the steering levers). Set
the FSC at several different speeds and ob-
serve if the mower moves in a straight line (use
cement joint or other line on the ground for ref-
erence).
NOTE: The final tracking adjustment is made
with the mower moving, since the adjustment is
quite sensitive and is more easily “fine tuned”
when moving.
3. If travel is not straight, tighten the adjustment
nut that is on the same side of the mower as
the wheel that is moving too fast, e.g., the
mower tracks to the right, indicating the LH wheel
is moving too fast, tighten the LH adjustment nut.
CAUTION
NEVER attempt to disconnect any safety
devices or defeat the purpose of these
safety devices.
LH Steering Lever
(For Orientation)
Neutral
Safety Switch
FSC Actuator
Clevis