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Scotts by Murray Drive Belt Comes Off

Posted by cappaweet (My Page) on
Sun, Nov 21, 10 at 14:52

Recently on my 18HP Scotts by Murray Lawn Tractor, the drive belt that goes from engine back to the tranny keeps popping off the pulleys once I let go the clutch. The issue seems to be with this pulley/wheel back near the main transmission wheel.

First The belt is supposed to be on this side of this particular pulley right? They can anyone confirm from the pictures I've attached that it's wore out? It has some chips in it as you can see. I don't think belt can stay on it anymore?

Photobucket

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Follow-Up Postings:

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RE: Scotts by Murray Drive Belt Comes Off

Yes, the flange on the little black clutching pulley has broken off, and must be replaced! BT/DT: RustyJ


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RE: Scotts by Murray Drive Belt Comes Off

Check all the idler pulleys both V and flat and make sure the pensioner isn't bound up... common on a Scotts Murray.

While you're there make sure the cooling fan on top of the trans is clean and clear of debris.


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RE: Scotts by Murray Drive Belt Comes Off

Thanks for the help. I'll check the rest of the pulleys and clean the fan.

I can't seem to find that clutching pulley on the parts diagram here. I would think it would be under motion drive.

http://www.partsandservice.com/html/Murray/lt/lt46561x8.html

Any ideas?

Here is a link that might be useful: Murray Parts 46561X8


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RE: Scotts by Murray Drive Belt Comes Off

There is a pulley that places tension on the drive belt when the parking brake is released.


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RE: Scotts by Murray Drive Belt Comes Off

Items 55 and 56 will do the trick. Commonly available I'd think at a local shop if you are so inclined. Any Briggs dealer can order if they don't happen to have them.


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RE: Scotts by Murray Drive Belt Comes Off

You should also check the transmission mounts to the frame to insure they are intact. On my MTD rider they rusted out; the transission moved a bit when the clucth was released and the belt jumped off!


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RE: Scotts by Murray Drive Belt Comes Off

I replaced the 56 pulley but that wasn't it. I took a few more pictures of that bad pulley, to try and figure out what part number it is. The diameter of the hole is 3/4" and overall diameter is ~2 inches. (assuming not alot of plastic is worn off).

The reducing bushing that fits inside is an inch long, and takes it down to fit a 3/8" bolt.

Any other ideas as to the part number?

Photobucket


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RE: Scotts by Murray Drive Belt Comes Off

Ref 56 is a V idler and the other #55 is a flat idler. The flat one was worn in the pic


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