Wheels Reverse; Neutral - MTD 450 Series Shop Manual

450 Series Tillers

Wheels Reverse

1. The shift arm pushes the shift fork all the way down.
2. The shift fork pushes the input spur gear all the way
down the input shaft.
3. There are two sets of teeth on the input spur gear: a
large set above the collar that engages the shift fork,
and a smaller set below the collar.
4. The bottom set of teeth on the input spur gear (turn-
ing Clock Wise) engages the bottom gear on the
counter shaft. See Figure 5.2.
NOTE: The gears on the counter shaft rotate in the
opposite direction of the input spur gear
(Counter Clock Wise).
5. The bottom gear on the counter shaft drives the bot-
tom gear on the main shaft in the same direction as
the input shaft.
6. The wheel drive transfer gear transmits power from
the bottom gear on the main shaft to the wheel drive
reduction gear.
7. The wheel drive reduction gear turns a sprocket to
drive the wheel axle via chain.
8. When the wheel axle turns the opposite direction of
the input shaft, the tiller will move in reverse. The
tines should not rotate. See Figure 5.3.

Neutral

1. If the operator of the tiller moves the control lever one
notch back from Wheels reverse, the tiller is in neu-
tral. See Figure 5.4.
2. The shift fork positions the input spur gear so that the
bottom set of teeth are above the bottom gear on the
counter shaft.
NOTE: Counter shaft removed in photo.
• The top set of teeth are below the paired wheel
gear (lower) and tine gear (upper) on the main
shaft.
• Nothing is engaged. The only parts inside the
chain case that turn are the input shaft and the
input spur gear.
26
For Parts Call 606-678-9623 or 606-561-4983
www.mymowerparts.com
Input spur gear
Shift arm
Input shaft
Counter shaft
Figure 5.2
Counter
shaft gear
(CCW)
Wheel axle (CCW)
Figure 5.3
Input shaft
Input spur gear
Bottom counter shaft
gear
Figure 5.4
Shift fork
Input shaft and
input spur gear
(CW)
Wheel drive
transfer gear
(CW)
Reduction gear (CCW)
Main
shaft