Servicing The Spark Plug; Drive System Maintenance; Adjusting The Self-Propel Drive - Toro 22291 Operator's Manual

Servicing the Spark Plug

Service Interval: Every 100 hours—Inspect, clean, and
adjust the spark plug gap; replace the
spark plug if necessary.
Use an NGK BPR5ES spark plug or equivalent.
1. Stop the engine and wait for all moving parts to stop.
2. Disconnect the wire from the spark plug.
3. Clean around the spark plug.
4. Remove the spark plug from the cylinder head.
Important: Replace a cracked, fouled, or dirty
spark plug. Do not clean the electrodes because
grit entering the cylinder can damage the engine.
5. Set the gap on the plug to 0.76 mm (0.030 inch)
20).
Figure 20
1. Center-electrode insulator
2. Side electrode
3. Air gap (not to scale)
6. Carefully install the spark plug by hand (to avoid cross
threading) until it is hand tight.
7. Tighten the spark plug to 23 N-m (2.3 kgf-m, 17 ft-lb).
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

Note: If the machine is new, does not self-propel, or tends
to creep forward, adjust the drive cable.
1. Move the machine outside and onto a paved surface
near a solid wall to safely prevent the machine from
moving forward while the engine is running.
2. Position the machine with the front tires against the
wall.
Note: Ensure that the area is well ventilated and clear
of debris that could be thrown by the machine.
(Figure
3. Start the engine; refer to
4. Pull the self-propel-drive bar to the handle.
Note: The wheels should start to turn as the
self-propel-drive bar just touches the handle.
5. Shut off the engine.
6. If you must adjust the machine, do one of the following:
•
If the wheels do not spin when you engage the
self-propel-drive bar, the traction belt is too loose.
Rotate the wheel-drive-control knob
clockwise 1 turn and repeat steps
1. Wheel-drive-control knob
•
If the wheels spin before you fully engage the
self-propel-drive bar, the traction belt is too tight.
Rotate the wheel-drive-control knob
counterclockwise 1 turn and repeat steps
5.
7. For a new traction belt, rotate the wheel-drive-control
knob clockwise 1 additional turn to allow for stretching
of the belt during the break-in period.
Note: You can skip this step if you are adjusting a
used belt.
19
Starting the Engine (page
(Figure
3 through 5.
Figure 21
(Figure
14).
21)
21)
3 through