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I recently bought a used Yard machines riding mower. 21 hp, 46 inch deck with 3 blades. I don’t know what year it is. It starts, runs and cut great. The only problem is that shortly after putting a new belt on, it got completely shredded. Afterwards I removed the deck, sharpened up the blades, completely cleaned and lubed everything, checked the pulleys and all that and everything seems fine. I’m wondering how do I find out what year this thing is, and is there a way to see a diagram of the deck to make sure all springs are where they are supposed to be? I really don’t want another shredded belt.

This should be of some assistance. Most likely you missed a belt guide when the new belt was installed cutting the belt.

One thing I just realized is the belt is cutting into the bottom of one of the pulleys coming from the top of the tractor. Is there a way to lower this pulley?

ILENGINE said:

This should be of some assistance. Most likely you missed a belt guide when the new belt was installed cutting the belt.

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Thank you!!

From what I looked up with your tag info it's 2004.
Anyway you can post a picture of the pulley interference ?
Did you install a factory belt for the deck ?

This is the one I’m talking about. It seems the belt is resting on the bottom of the pulley and as a result, is cutting into the belt. The belt is not factory made.

Not sure how well you can see this, but this is the damage it’s cause to a newly replaced belt after about 30-40 minutes of cutting

That looks like a Napa belt..anyway, most all aftermarket belts are not the same as OEM and don't work right or last any amount of time!

mower king said:

That looks like a Napa belt..anyway, most all aftermarket belts are not the same as OEM and don't work right or last any amount of time!

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Especially on MTD or JD products.

ILENGINE said:

Especially on MTD or JD products.

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Would a OEM belt be the only solution?

ILENGINE said:

Especially on MTD or JD products.

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Would a OEM belt be the only solution? I know they are a little spendy

Ld454 said:

Would a OEM belt be the only solution? I know they are a little spendy

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No, that might not be the end all....of problems you may have. We can only go by what you say and how you say it....in reality, one persons left, is another persons right...so to speak, so kinda hard to say 100% on anything we don't have our hands on.

But we all try to help!

MTD mowers are OEM belt specific because of the special width and cut angle. That may be part of the issue but maybe not be all of it. What I see with using non OEM or OEM style belts on MTD or JD in some cases is they will slip and not grip the pulleys correctly I don't know if your belt issue is from slippage and overheating of the belt, or if there is another mechanic issue damaging the belt.