Craftsman 247.88845 Operator's Manual page 22

4. Using a 3/4" wrench, hold the hex shaft and remove the hex
screw and belleville washer and bearing from left side of the
frame. Refer to Figure 32.
5. Holding the friction wheel assembly, slide the hex shaft out of
the friction wheel assembly and the right side of the frame. The
spacer on the left side of the hex shaft will fall and the sprocket
should remain hanging lose in the chain.
6. Lift the friction wheel assembly out between the axle shaft and
the drive shaft assemblies.
7. Remove four screws securing the friction wheel to the hub
assembly (refer to Figure 33). Discard old friction wheel.
8. Reassemble the new friction wheel onto the hub assembly,
tightening the four screws in rotation and with equal force. It is
important to assemble the friction wheel symmetrically for proper
functioning.
9. Reposition the friction wheel assembly in the snow thrower frame.
Insert the pin from the shift arm assembly into the friction wheel
assembly and hold assembly in position. Refer to Figure 34.
10. Slide the hex shaft through the right side of the frame toward the
left side and through the friction wheel assembly.
11. After making certain that the chain is on both the large and the
small sprocket, align the hex shaft with the hex hub of the small
sprocket, and slide the shaft through the sprocket.
NOTE: If the sprocket fell from the snow thrower while removing the
hex shaft, place the sprocket on the chain. Realign the sprocket on the
chain with the hex hub facing the right side of unit. Position the hex
hub of the sprocket toward the friction wheel when sliding the sprocket
on to the hex shaft.
SERVICE AND MAINTENANCE
Remove Hex Screw
Belleville Washer
Hex Shaft
22
Figure 31
Friction Wheel Ass'y.
Slide Hex
Shaft Out
Right Side
Figure 32
Figure 33