Adjusting The Traction Interlock Switch; Replacing The Pto Switch - Toro 30789 Operator's Manual

wheel stops rotating, tighten capscrews holding pump
plate against side of transmission. Verify the adjustment
with throttle in SLOW and FAST position.
7. Block right front tire and both rear tires so vehicle
cannot roll forward or backward.
8. Jack up frame so left front wheel is off the shop floor.
Use a jack stand to support the frame.
9. Start engine and allow it to idle for 5 minutes to heat oil
in transmission to operating temperature.
10. Release parking brake; then check left front wheel that
is off shop floor. Wheel must not be rotating. If wheel is
rotating, proceed to step 11 for an adjustment. If wheel
is not rotating, proceed to step 13. Verify the adjustment
with throttle in SLOW and FAST position.
11. Because the wheel is rotating, the pump plate must be
adjusted. But before adjusting the pump plate, move
throttle to SLOW. If wheel is rotating forward, loosen
capscrews, and lightly tap bottom of pump plate
counterclockwise (Fig. 38). By contrast, tap pump plate
clockwise if wheel is rotating backward (Fig. 38). When
wheel stops rotating, tighten capscrews holding pump
plate against side of transmission. Verify the adjustment
with throttle in SLOW and FAST position.
12. Should front wheel continue to rotate, check for the
following:
Ball bearing is loose or worn out (Fig. 38).
Plunger on interlock switch is sticking.
Loose or missing fasteners
Worn roll pin securing pump lever to transmission
Pump lever loose on control shaft. (Correct by
applying Loc-tite 271 or 601 to shaft.)
Weak or damaged leaf springs (Fig. 38). Replace.
Internal transmission component malfunction.
Contact your local Toro distributor for assistance.
13. Shut engine off.
14. Adjust traction control rod; refer to Adjusting the
Traction Control Rod, page 37.
Adjusting the Traction Interlock
Switch
1. Adjust transmission for neutral; refer to Adjusting the
Traction Drive for Neutral, page 36.
2. Actuate the pump lever (Fig. 38) to ensure all parts are
operating freely and seated properly.
3. Loosen jam nut. Rotate switch adjusting screw (Fig. 38)
until there is a gap between head of screw and switch
button.
4. Rotate adjusting screw until it contacts the switch
button. Continue to rotate the screw until the circuit is
completed (switch "clicks"). After the switch clicks,
rotate the adjusting screw an additional 1/2 turn.
Tighten jam nut.

Replacing the PTO Switch

1. Remove instrument cover and disconnect negative
battery cable from battery.
2. Move PTO lever forward to ON position.
3. Remove boot from button end of PTO switch (Fig. 39).
Retain boot for reinstallation. Separate switch wire
connectors.
1. PTO switch
4. Remove front jam nut securing switch to mounting
bracket and remove switch.
5. Install new PTO switch to mounting bracket. Adjust
switch so it is depressed 1/2 in. (13 mm) when PTO
lever is moved to OFF position. Tighten jam nuts to
75 in.-lb. Install boot to switch.
Important Switch threads will be damaged if jam nuts
are over tightened.
6. Connect a continuity tester or ohm meter to switch
connector. With PTO lever in the ON position the
switch circuit should not have any continuity. If there
is continuity, recheck switch installation. If there is no
continuity, proceed to next step.
7. Move PTO lever to the OFF position. When PTO lever
is in its normal, released position, the PTO switch
should have continuity. If there is no continuity,
recheck switch installation. If there is no continuity,
proceed to next step.
8. Push switch connectors together.
9. Connect battery cable and install instrument cover.
37
Figure 39