MTD 450 Series Shop Manual page 60

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450 Series Tillers
12. Temporarily install the input pulley onto the input shaft, installing the bolt that holds it just far enough that the
pulley will not fall off.
13. Use an allen wrench to move the shift arm through each of the tiller mode positions, while turning the input pul-
ley. Confirm correct operation in all of the modes:
NOTE: It is usually necessary for the gears to be turning for them to align properly to shift
• Wheels Reverse: Turning the shift arm counter-clockwise as far as it will go will engage wheels reverse.
In wheels reverse, the wheel axle will turn in the opposite direction of the input shaft. The tine shaft may
rotate from drag between the gears, but should not turn with any significant force.
• Neutral: Turning the shift arm one notch clockwise should disconnect the input shaft from the wheel axle
and the tine shaft. Turning the input shaft should not drive either of the output shafts with any significant
force.
• Wheels Forward: Turning the shift arm one notch clockwise from Neutral should allow the input shaft to
turn the wheel axle in the same direction that the input shaft is turned.The tine shaft may rotate from drag
between the gears, but should not turn with any significant force.
• Tines Reverse: Turning the shift arm two notches clockwise from neutral should connect the input shaft to
the tine shaft and the wheel axle in such a way that the wheel axle turns the same way the input shaft is
turned, and the tine shaft turns in the opposite direction. The wheel axle and tine shaft should turn with full
force. The wheel axle will turn once for every 13 revolutions for the input shaft. The tine shaft will turn once
for every two revolutions for the input shaft.
• Tines Forward: Turning the shift arm to the most clockwise notch in its travel should connect the input
shaft to the tine shaft and the wheel shaft in such a way that the wheel shaft, tine shaft and the input shaft
all turn in the same direction. The wheel axle will turn once for every 13 revolutions for the input shaft. The
tine shaft will turn once for every two revolutions for the input shaft.
• If any of the chain case drive modes do not work correctly, remove the top half of the housing and identify
the problem.
14. Once correct operation of the chain case is confirmed, set the shift arm to the Neutral position.
15. Tighten all the fasteners that hold the two halves of the chain case together:
• Tighten the nuts on each of the shafts to a torque of 30 ft.-lbs. (40 Nm).
• Tighten the perimeter screws to a torque of 80-110 in-lbs. (9-12 Nm).
• Tighten the nut/bolt combinations to a torque of 180-200 in-lbs. (22-2 Nm).
• Tighten the input pulley bolt to a torque of 80-110 in-lbs. (9-12 Nm).
16. Make a final test of the chain case, testing all the modes of operation as was done before tightening the fas-
teners holding the chain case halves together.
17. If the shaft seals were removed, drive new seals onto the wheel axle and tine shaft. Drive the seals into place
using a driver that meets the seals as close to the outside wall of the seal shells as possible.
18. Assemble the remainder of the tiller.
19. Test all aspects of the tiller's operation before returning it to service.
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