MTD 300 series Shop Manual page 16

TRACTION DRIVE SYSTEM
4. Remove the spark plug and insert a 20" piece of starter
rope to act as a piston stop and prevent the engine from
turning.
5. Remove the bolt that holds the auger drive pulley to the
engine crankshaft with a 9/16" wrench. See Figure 3.10.
NOTE: The auger belt drive pulley is a split-sheave design.
6. Slide the outer auger pulley sheave off of the crank shaft
and remove the auger belt. See Figure 3.11.
7. Remove the inner auger pulley sheave, and the spacer that
fits behind it off of the crankshaft. See Figure 3.12.
12
Auger drive pulley
Figure 3.10
Inner
sheave
Figure 3.11
Spacer
Figure 3.12
Outer sheave