Drive System Maintenance; Adjusting The Self-Propel Drive - Toro 22196 Operator's Manual

7. Tighten the spark plug an additional 1/2 turn if it is
new; otherwise, tighten it an additional 1/8 to 1/4
turn.
Important: A loose spark plug can become very
hot and can damage the engine; overtightening
a spark plug may damage the threads in the
cylinder head.
8. Connect the wire to the spark plug.
Drive System
Maintenance

Adjusting the Self-propel Drive

Service Interval: Every 100 hours
If the lawn mower does not self-propel or has a tendency
to creep forward when the control bar is more than
1-1/2 inches (3.8 cm) from the handle, adjust the wheel
drive control knob on the rear of the gear box.
1. Close the door in the lawn mower housing and
remove the grass bag.
2. Rotate the control knob clockwise a half turn if
the lawn mower does not self-propel. If the lawn
mower creeps forward, rotate the knob a half turn
counterclockwise to loosen the belt (Figure 30).
1. Control knob
3. Slowly pull the lawn mower backward while you
gradually move the control bar toward the handle.
Note: The adjustment is correct when the rear
wheels stop turning and the control bar is about one
inch (2.5 cm) from the handle (Figure 31).
1. 1 inch (2.5 cm)
23
Figure 30
Figure 31