Scotts by Murray Drive Belt Comes Off

cappaweetNovember 21, 2010

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?

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

    Bookmark   November 21, 2010 at 5:26PM
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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.

    Bookmark   November 21, 2010 at 5:57PM
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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.

Any ideas?

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

    Bookmark   November 21, 2010 at 8:12PM
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There is a pulley that places tension on the drive belt when the parking brake is released.

    Bookmark   November 21, 2010 at 9:09PM
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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.

    Bookmark   November 21, 2010 at 9:51PM
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esemilio(Z5 WI)

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!

    Bookmark   November 23, 2010 at 9:45AM
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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?

    Bookmark   November 27, 2010 at 3:51PM
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Ref 56 is a V idler and the other #55 is a flat idler. The flat one was worn in the pic

    Bookmark   November 27, 2010 at 5:25PM
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