MTD 31AE5MLG729 - Manual (Page 21)

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20.3. Align one of the holes in the impeller with the
idler arm nut on the front of the auger housing.
See Figure 54.
20.4. Using a 9/16’ socket on a long extension and a
15/16” socket on a ½’ socket wrench, remove
the nut and shoulder screw attaching the idler to
the auger housing. See Figure 55.
20.5. Inspect the idler pulley for wear or damage.
NOTE: The idler pulley can be removed using a
9/16” socket and a 9/16” opened end wrench.
Figure 54
Alignment Hole
Figure 55
Idler Arm