MTD 450 Series Shop Manual page 42

For Parts Call 606-678-9623 or 606-561-4983
450 Series Tillers
5. Notice the orientation of the spacer and the tine shaft:
See Figure 5.33.
• One side of the tine shaft has a weld bead where
the shaft is attached to the sprocket, the other
side is flat.
• The convex side of the spacer goes toward the
sprocket, so that the bead fits into the recess in
the spacer. See Figure 5.33.
• One washer fits between the spacer and the
lower half of the chain case housing.
• The other washer fits on top of the axle shaft
sprocket.
• If the axle or spacer are installed reversed, it will
bind.
• If the whole assembly is reversed, the chain will
be misaligned.
6. Inspect the bearing in the housing. If the bearing is
visibly worn on the thrust surface or the bore, it can
be driven out and replaced. See Figure 5.34.
• Use an appropriate-size driver to drive or press
the bearing out of the hexagonal hole that it fits
into.
• If unusual wear is isolated to one of the two bear-
ings, replace just the damaged bearing.
• In most cases, the bearings will be replaced as a
pair.
7. Press or drive the replacement bearing into the hous-
ing using an appropriate size arbor or driving tool that
will not damage the thrust surface of the bearing.
See Figure 5.35.
• Press the bearing all the way home. There
should be no visible gap between the flange on
the bearing and the inside of the housing.
• If the bearings are not fully seated, thrust clear-
ance between the tine shaft and its bearings may
be less than zero, causing the case to bind and
accelerating bearing wear.
38
www.mymowerparts.com
Tine shaft
Washer
Sprocket
Spacer
Washer
Bearing
Figure 5.33
Seal driver
Figure 5.34
Hydraulic ram
Arbor (socket)
Bearing
Case
Figure 5.35