TECH MINUTE - Steering Adjustments on Walker Model C, T, and D Eaton M7 Transmissions

The following instructions reflect the most current transmission linkage configuration with a spring/ dampener connected to the steering lever (starting S/N 11-109716) and the FSC using direct linkage instead of a sliding fork disconnect (starting S/N 15134121). Earlier units will need to use the transmission control adjustment instructions from the P/N 9000-30 Service Manual.

IMPORTANT: The proper adjustment of the transmission control stops is essential for efficient operation and life of the transmission. These stops are properly adjusted at the factory and should only require readjustment if the transmission or related control linkage is removed or changed.
CAUTION: NEVER attempt to disconnect any safety devices or defeat the purpose of these safety devices.

NOTE: It would not be unusual for a new machine, after initial 5 or 10 hours of operation, to begin to not travel straight (this is due to the break-in of the transmissions). In this case, proceed to Straight Ground Travel Adjustment - Step 4.

IMPORTANT: The following adjustment procedures are sequential. Check and adjust each function in the order given.

Set FSC Travel Limits (Stop) - Step 1:

1. Move the Forward Speed Control (FSC) lever to the most FORWARD position.
2. Check clearance of the RH and LH steering lever actuator arms with the frame and adjust forward stop bolt so each lever clears the frame by at least 1/16 in. (1.6 mm). Clearance of the arm to the frame should be checked while applying pressure back on the arm to remove any slack in the linkage.
3. Tighten the jam nut on the forward travel stop adjusting bolt.

Set Maximum Forward Travel Speed (Stop) - Step 2:

1. Position the FSC lever to the most FORWARD position.
2. Turn the steering lever adjustment nut(s) until 2 or 3 threads are showing past the end of the nut.
3. Loosen the jam nut at the other end of the control rod (where it connects to the transmission control arm).
4. For each steering lever, use a wrench on the adjustment nut, turn the control rod counterclockwise (CCW) until the steering lever begins to move backward, then make two additional turns. Next, reverse and turn the control rod clockwise (CW) until the steering lever stops moving forward and then make one additional turn. Tighten the jam nut.
NOTE: Failure to make at least one extra turn on the control rod can place excessive loads on the transmission internal control stops and cause internal wear and damage to the transmission. Making additional turns beyond one turn reduces the maximum forward travel speed.

Neutral Function Adjustment - Step 3:

1. Securely block the tractor up so the drive tires are off the ground.
2. Move the FSC lever to the NEUTRAL-PARK position (rear travel limit).
3. 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 the operation of the neutral safety switch.
4. If drive wheels are moving, adjust the FSC neutral stop by adjusting the FSC actuator rod (see Neutral Function Adjustment photo). If the drive wheels are moving backward, loosen the jam nut and lengthen the FSC actuator rod by turning the adjustment nut counterclockwise (CCW). If the drive wheels are moving forward, use the opposite clockwise (CW) adjustment.
5. At this point it may not be possible to adjust both wheels stationary since the differential adjust 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 forward slightly.
6. Check the neutral safety switch for closure and function with the FSC in neutral (the engine will not start when the switch is open).

Straight Ground Travel Adjustment - Step 4:

1. Sit in the seat, start the engine (operate at normal speed), and with the FSC in the NEUTRALPARK position check for forward movement of either drive wheel (if either wheel moves backward, refer back to Neutral Function Adjustment - 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 surface (with hands off the steering levers). Set the FSC at several different speeds and observe if the mower moves in a straight line (use cement joint or other line on the ground for reference).
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.

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