Lawnmower transmission problem

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Nov 11, 2006 | 12:40 AM

boulderdentist

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Joined: Jun 2003

Posts: 61

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From: Westminster, CO

Lawnmower transmission problem

Have a 1994 YardMan lawnmower with a Briggs and Stratton engine, has a six speed self propelled transmission. In the last six weeks at least three times the drive belt has slipped off and made the self propelled inoperable. I have dissasembled, reasembled, nothing appears to be out of order, works fine, then with no warning the drive belt slips off. I have searched for troubleshooting and wonder if the drive belt is stretched? This mower is in its 13th season, original drive belt went for about 9, then snapped abruptly. Any ideas? The engine runs well, cuts great, but as a push mower without the self proprelled is miserable, heavier and more difficult to push than a "walk behind mower". Any suggestions?

Thanks, Scott

Nov 11, 2006 | 12:50 AM

Joelski

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Joined: Nov 2005

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From: Buckeye Country

Sounds like loose mounting bolts are letting the tranny pulley come out of alignment.

Nov 11, 2006 | 02:05 AM

BlueOvalBoy

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Joined: Jun 2002

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From: Brighton, Colorado

Try gardenweb.com. There is a forum for lawn tractors.

Nov 11, 2006 | 01:44 PM

Ford_Six

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Joined: Oct 2002

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From: The Big, Oregon

Either the belt is stretched, the engine or tranny mount bolts are loose, or the deck is cracked, allowing things to flex out of alignment.
Take a close look at the input of the tranny, and make sure you can't shake the pullley around too much in any direction. There should be an e-clip or snap ring under the pulley that does wear out after a bit, so it is possible the pulley is moving out of alignment.

Nov 12, 2006 | 09:50 AM

GlennFordx4

Fleet Mechanic

Joined: Jan 2005

Posts: 1,413

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From: cape may county NJ

It probably just the belt but check the idler it should be a bearing with a reducer bushing in the center I think its a 6203 or 6204.Sometimes when running it will lock up causing the belt to strech and fall off.when ever I change a belt on one of those I usually change that bearing just to be safe.