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Old 12-27-2010, 08:56 PM   post #1 of 29
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Default Belt Keeps Coming Off Pulley

Hi,

I have a Craftsman Tractor with a 40" snowblower attachment. The tractor is a 19.5 hp that's about 13 years old.

The problem is the belt A110 keeps coming off the pulley whenever I'm snowblowing. The pulleys appear to line up and the belt seems tight.

It was breaking the belts, now they just fall off.

Anyone know what might be going on here?

Thanks.
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Old 12-28-2010, 02:37 AM   post #2 of 29
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Default Re: Belt Keeps Coming Off Pulley

It could be lots of things, but it's very hard to comment without knowing the model numbers involved.

Provide specific info on the problem, as well. What is belt A110? That is, what is its function. Exactly what do you do to cause it to come off? (Engage blower, start to move forward, run into a pile of snow, etc.).

Maybe you can have someone else drive the machine while you watch carefully what happens.
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Old 12-28-2010, 06:49 AM   post #3 of 29
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Default Re: Belt Keeps Coming Off Pulley

Thanks for the reply.

The lawn tractor model # is 917.259566.

Snowthrower is a Craftsman model # 486.24840.

A110 is the belt # that powers the snowblower. The belt doesn't come off when I engage the blower, it comes off while blowing snow, usually within a couple of minutes. It seems to come off the rear 5 1/2 inch pulley.
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Old 12-28-2010, 07:11 AM   post #4 of 29
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Default Re: Belt Keeps Coming Off Pulley

This is just a W.A.G. so I may be in left field. But I think the pulley or a belt "guard" may be damaged.

Is there a belt "guard" or retainer damaged or missing?

Are one of the pulleys damaged?

Is the belt damaged? (cut, nick or worn spot)?

Is the belt "clutch" mechanism tight or does it have play (wobble)?

Do you have manuals for the tractor or snowblower?

Is this equipment new to you, or has it run in the past FOR YOU without a problem?

I hope this is helpful. Let me know how it works out.
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Old 12-28-2010, 09:40 PM   post #5 of 29
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Default Re: Belt Keeps Coming Off Pulley

An A110 sounds like an automotive type belt, " width, 110" long. It may not be the right belt for the application. It may be deforming under load, causing it to jump a pulley - especially if it's not tight enough.
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Old 01-19-2011, 01:28 PM   post #6 of 29
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Default Re: Belt Keeps Coming Off Pulley

Well I had a small engine repair service come pick up the tractor and look it over. Saw nothing wrong with it.

Just got 3 inches of snow last night and took the tractor out this morning. Worked fine for half and hour, then snapped a brand new belt in half. This belt is a Gates A110 which is 112 inches long not 110 as I said before. I do believe it is an automotive belt which could be my problem.

Does anyone know a good heavy duty/industrial belt to replace this Gates 1/2 inch by 112 inch v belt with?

Thanks
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Old 01-19-2011, 01:41 PM   post #7 of 29
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Default Re: Belt Keeps Coming Off Pulley

I believe if you look for a NAPA belt, the PN should be something like "4L110W" - They are made by gates as well. If your blower has a 90degree belt twist on it, it may just be the design. My dad was chewing thru a belt a storm with his Berco blower. Has this only been happening recently? Maybe a bushing is worn, and it kicks sideways when it gets load on it. Maybe you need a 5/8" wide belt. That would make it come off if the belt it too narrow.
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Old 01-19-2011, 01:55 PM   post #8 of 29
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Default Re: Belt Keeps Coming Off Pulley

It just started happening out of the blue. Never had a problem with it until late last year and so far all of this year. I've broken my fourth belt today.

Now they're saying a nor'easter may hit here friday night.

Very frustrating.
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Old 01-19-2011, 02:06 PM   post #9 of 29
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Default Re: Belt Keeps Coming Off Pulley

An A110 seems to be an automotive belt. It won't handle the power you're trying to put through it. I believe that belt is only rated for a few horsepower, maybe 5 or so, I can't remember. You need a stronger belt.
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Old 01-19-2011, 02:29 PM   post #10 of 29
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Default Re: Belt Keeps Coming Off Pulley

Quote:
Originally Posted by Fcubman View Post
An A110 seems to be an automotive belt. It won't handle the power you're trying to put through it. I believe that belt is only rated for a few horsepower, maybe 5 or so, I can't remember. You need a stronger belt.
Do you have a suggestion? Manufacturer?

Thanks
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Old 01-19-2011, 02:52 PM   post #11 of 29
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Default Re: Belt Keeps Coming Off Pulley

Quote:
Originally Posted by Robel View Post
Do you have a suggestion? Manufacturer?

Thanks
Perhaps someone like NAPA could cross the OEM number. They might also be able to come up with something given the length, width, and application of the belt.
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Old 01-19-2011, 02:59 PM   post #12 of 29
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Default Re: Belt Keeps Coming Off Pulley

Thanks, I'll check it out.
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Old 01-19-2011, 03:00 PM   post #13 of 29
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Default Re: Belt Keeps Coming Off Pulley

Good luck - keep us posted, please!
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Old 01-19-2011, 03:31 PM   post #14 of 29
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Default Re: Belt Keeps Coming Off Pulley

I looked on NAPA website, and they don't list a 112 or a 110 inch Fractional Horsepower belt

Looking on Sears Parts Direct, you model comes up as 486248400 and it says the main drive belt is 55" long... do you only have one belt on the blower or two?

Diagram

otherwise what they list as a snowthrower belt (not sure why they list 2) has a PN but no length
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Last edited by GT_80; 01-19-2011 at 03:42 PM.
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Old 01-19-2011, 04:13 PM   post #15 of 29
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Default Re: Belt Keeps Coming Off Pulley

Snow thrower belt
Number:47278 Substitution:47846 Manufacturer authorized substitution: 47846 may differ in appearance, but is a functional equivalent to prior parts including 47278.
$63.99 In stock
IS this the belt?
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