John Deere MTF-031071L ユーザーズマニュアル

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MTF-031071L
How To Replace The Friction Wheel
If the friction wheel is worn or damaged, the snow thrower will
not move forward. The friction wheel  must be replaced as
follows.
1.
Remove the gas from the gas tank. Stand the snow
thrower up on the front end of the auger housing (4).
(see Figure 38).
WARNING: 
Drain the gasoline outdoors, away
from fire or flame.
2.
Disconnect the spark plug wire.
3.
Remove the fasteners that secure the left wheel. Re-
move the left wheel from the axle (see Figure 41)
4.
Loosen the bolts on each side of the bottom panel.
5.
Remove the bottom panel.
Figure 41
Wheel
Axle
Bolt
Bolt
Bottom 
Panel
6.
Remove the fasteners that secure the drive sprocket to
the axle (see Figure 42).
7.
Remove the right wheel, axle, and drive sprocket.
Figure 42
Axle
Drive
Sprocket
Chain
8.
Remove the four bolts that hold the bearings on each
side of the hex shaft (see Figure 43).
9.
Remove the hex shaft and bearings.
NOTE: Take special note of the position of the
washers on the hex shaft.
Figure 43
Bolts
Bolts
Bearings
Hex Shaft