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I changed the belt on the mower deck and now it keeps slipping off the pulleys when the mower is lower. Any ideas as to what to do?

Possibly a missing belt guide, or incorrectly installed belt.

Idler mount has shot craps.

MOWER HOUSING Diagram & Parts List for Model 502256210 Craftsman-Parts Riding-Mower-Tractor-Parts | SearsPartsDirect parts diagram, did you use OEM Sears belt listed in parts? Check out idler pulley item 6 for bad bearing & pulley, you will have to remove pulley to inspect, also by hand check all parts for being tight & secure. Let us know what you find, thanks.

CPSC, Murray Inc. Announce Recall of Riding Lawn Mowers | CPSC.gov Read this recall notice

Do you have an operators manual, if not contact sears & ask them to email manual to you.

ILENGINE said:

Possibly a missing belt guide, or incorrectly installed belt.

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I already replaced the idler pulley when I replaced the belt. What I'm trying to find and can't is a guide on how those don't guys should be adjusted. I can't seem to find any reference material at all. can anyone tell me or show me how they build guides should be adjusted? thank you very much for your replies all of you.it's obvious that there is a trick to adjusting all of this so it runs properly.

Sorry, build guides should read belt guides.