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you are correct on everything you wrote.... however when engaging the drive lever, the rubber wheel disk does not spin the disc because the drive belt is too loose, tightening the drive cable doesn't help at all
so the belt is slipping at all the points of its travel? slipping only on the large drive pulley, the one attached to drive friction disc? slipping on the engine pulley?

ive heard of a bad pulley where the "v" in the pulley was too worn out so the belt would not grip the sides of the "v" in the pulley especially if under load no matter how tight the belt was

edit. u could spray into the "v" of the bad pulley w/what football players use to help catch the ball, stickum iirc to test it out, might only work for a minute or 2 if at all
 

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Discussion Starter #22
I will make a video and share. The drive belt, when installed, with the motor off, should be tight. The auger belt will not be as tight as if it was the auger blades would always spin and cause potential injury.
When I install the drive belt, the tensioner and belt in the correct position, the belt is not tight at all. That is the whole problem.
The split pulley has both metal tips in tact which slides into the engine shaft no problem. It's looks to me that the tensioner is not doing anything to tighten the belt. Again, even though the belt is hooked around the lower drive disc and hooped around the upper drive pulley and around the tensioner, WHEN STARTING THE ENGINE, the drive pulley spins but the belt does not spin because it's too loose
 

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spring in idler pulley is weak or not installed correctly.
or pivot point for bracket holding idler pulley needs lube or is binding on something.
or try a belt 1 inch shorter, goto auto parts store, bring belt w/you, ask them to measure and buy an indrustrial or farm vbelt thats 1inch shorter, not automotive vbelts.
 

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Jan 2019 - I was having the exact same problem with my MTD Yard Machines Snow Blower. Drive belt good, seated correctly, friction rubber wheel making solid contact with drive flywheel. When i would engage the drive, the blower would move an inch then stop - just as you had described above.

I discovered the issue and came up with a solution. The problem was the drive idler pulley. The hole in the idler arm in which the idler pulley bolt screwed in was stripped, thus the bolt was not holding the idler pulley well, thus no real tension on the drive belt. Lucky for me I had a bolt the same diameter, only slightly longer. I disassembled the idler arm from the engine, ran the bolt through the back of the idler arm (through the stripped hole) and used two nuts to secure the pulley to the idler arm. Then re-assembled the whole assembly, and hooked the spring back over its bolt to add tension. Now the drive belt was spinning properly when the motor was on, and the snowblower now moves in all 5 gears and the 2 reverse. Great because its snowing outside right now - need it for the morning!!!!!
 
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