yard machine lawn tractor drive belt


Old 09-10-07, 04:40 PM
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Join Date: Sep 2007
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yard machine lawn tractor drive belt

I have a yard machine lawn tractor. When I put the drive belt on and go in reverse the drive belt pops off. Sometimes I can go forward and back a few times and then it pops off. Really frustrating!! Also, can I use a metal starter gear or do I have to use plastic? The plastic is garbage.
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Old 09-10-07, 08:18 PM
duigoose's Avatar
Join Date: Jul 2006
Location: USA
Posts: 306
Here is my usual $.01 - As for the belt, is this a new belt or an OLD belt? If new I would think you have an alignment problem or other mechanical problem, if old it sounds like its time for a new belt.

For the starter gear, how fast are you eating them up?
Old 09-10-07, 08:41 PM
msidan's Avatar
Join Date: Apr 2006
Location: Gouverneur
Posts: 289
I had the same problem with an MTD tractor. Check the pulley on top of the tranny and see if it's loose/wobbly. Let us know.

I've never had to replace my plastic starter gears. Is this a briggs or tecumseh?
Old 09-10-07, 10:44 PM
cheese's Avatar
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Join Date: Jul 2001
Location: USA
Posts: 16,819
If the engine came with the plastic gear, the metal ones won't work. Or rather, they will but not long...it will chew up the ring gear on the flywheel, which is much more difficult and expensive to replace.

If you need more than one starter drive gear in 5-10 years, then you probably have a different problem causing it. I'm guessing you're not using original equipment gears, but rather an aftermarket gear.

The belt jumping off could be due to a cracked frame allowing the tranny to rock downwards, tilting the input pulley and letting the belt jump. It could be the tensioner arm out of alignment with the belt and other pulleys. Could be a loose pulley on the tranny as msidan said too.

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