Replacing The Drive Belt - Toro 38172 Operator's Manual

5. Slide the old rotor blade out from between the blade
supports (Fig. 9).
6. Examine a new rotor blade edge for the difference in
layer thickness (Fig. 9).
Note: Install the rotor blades with the thick layer on the
inside of the curve. (Fig. 9). If you do not install the
blades properly, the blades will be out of balance and
cause the snowthrower to "hop" or "bounce."
7. Insert a new rotor blade between the blade supports.
8. Secure the center of the rotor blade to the blade
supports with two bolts and two locknuts.
9. Position the screw heads on the thick layer side of the
rotor blade (Fig. 9).
10. Curve the rotor blade and secure it with the remaining
four torx screws and locknuts, positioning the screw
heads on the thick layer side of the rotor blade (Fig. 9).
11. Tighten all screws and locknuts securely.
12. Repeat steps 4 through 11 above to replace the other
rotor blade.
13. Connect the wire to the spark plug.
14. Install the control panel.
15. Insert the key in the switch.

Replacing the Drive Belt

Inspect the drive belt before each season, and replace it if it
is worn or damaged.
1. Stop the engine and wait for all moving parts to stop.
2. Remove the key from the switch.
3. Disconnect the wire from the spark plug. Refer to steps
3 through 5 of Replacing the Spark Plug on page 14.
4. Remove the two short self-tapping screws, one long
self-tapping screw, one bolt, one washer, and one nut
that secure the left side cover to the snowthrower frame
(Fig. 10).
1. Bolt, nut, and washer
2. Short self-tapping screws
5. Remove the cover.
6. Pull the idler pulley up slightly while pulling out the old
drive belt. Allow the pulley to gradually release when it
can move past the belt (Fig. 11).
1. Drive belt
2. Idler pulley
7. Rotate the rotor and work the old drive belt off the rotor
pulley. The belt should slide easily off the drive pulley
(Fig. 11).
8. Loop the new drive belt around the drive pulley. While
holding the new drive belt, slip it onto the rotor pulley
and rotate the rotor until the belt is completely on the
rotor pulley (Fig. 11).
Ensure that the long end of the idler spring is hooked
into the housing notch and that the round end of the
spring is hooked onto the pin on the back of the idler
pulley (Fig. 12).
13
Figure 10
3. Long self-tapping screw
Figure 11
3. Drive pulley
4. Rotor pulley