Snowblower Drive Belt
Have you tried to adjust the cable to the idler?
And you may be right, depending on the material of construction for the worm gear assemblies, I was thinkg that it would be steel or aluminium, but I guess it could be plastic.
I know the shear bolts, if its an older unit, can shear and the corrosion between the shaft and the auger can cause enough friction to allow the auger to spin with a light load.
There isn't much else to do, they are pretty simple assemblies.
When its all said and done there is usually more said than done
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