Belt Replacement - MTD 450 Series Shop Manual

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450 Series Tillers

Belt Replacement

IMPORTANT: If the belt has failed prematurely, identify and correct the cause of the failure before installing the
replacement belt. Conditions that might cause early belt failure include:
1. Use of the wrong size or type of belt.
2. Installation: Mis-routed belt, missing belt guards or keepers, Mis-adjusted tension
3. Damage: Misalignment of pulleys, binding or seized idler pulley
4. Damage: Foreign objects or nesting materials inside the belt guard
5. Misuse: Continued operation after the tines are jammed with foreign material (logs, large rocks, cable).
6. Misuse: Improper use of the clutch: tilling with the clutch only partially engaged.
7. Defective belt.
If the belt has failed prematurely, look for clues on the belt itself, related parts, the condition of the tiller, and state-
ments made by the operator of the tiller.
IMPORTANT: This tiller has been engineered to use a belt with a Kevlar cover for longer life and better perfor-
mance. The proper part number belt for this tiller is Part No. 754-0434.
1. Disconnect the spark plug wire from the spark plug,
and ground it to the engine block or tiller frame.
NOTE: On some older model tillers, the belt cover
may be captured by the left wheel. Follow
steps #2a and #2b if this is the case.
2. Remove the belt cover: See Figure 2.3.
2a. Remove the clevis pin or nut and bolt securing
the left wheel assembly to the wheel shaft
using a pair of 7/16" wrenches.
2b. Slide the left wheel assembly away from the
belt cover.
NOTE: It is not necessary to remove the wheel.
NOTE: Propping-up the chain case on a solid object
will make it easier to slide the wheel out.
2c. Remove both torx-head screws securing the
top of the belt cover to the tiller casing using a
T-27 torx driver.
2d. Remove the nut and flat washer holding belt
cover using a 7/16" wrench.
2e. Remove the hex screw securing the belt cover
to the engine mounting bracket using a 3/8"
wrench.
2f. Remove the belt cover from the tiller.
3. Remove both of the screws and lock washers hold-
ing the belt keeper bracket to the engine using a 1/
2" wrench. See Figure 2.4.
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Belt Cover
Figure 2.3
Belt keeper
bracket
Figure 2.4