How to Change a Belt and Pully on a Sears Riding Mower

Craftsman 17.5 hp 42 in. Deck Lawn Tractor
Craftsman 17.5 hp 42 in. Deck Lawn Tractor (Image:,0%26resMode%3Dsharp%26op_usm%3D0.9,0.5,0,0&imgrefurl=

This is what we did with ours. We were told to do this by a mechanic and we kept the instructions. These are general instructions, not based on any particular lawn mower. Good luck!

Things You'll Need

  • parts list
  • manual
  • new belt
  • some general tools, depending upon your mower

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  • If you don't have a parts list, go to the Sears website. They offer them there. It should show in one of the sketches how and where the belt needs to be routed.
  • Then go to a sears repair with your old belt and part number and buy a new one. Make sure you compare the belts to each other to make sure they are the same.
  • If you have a newer mower, there should be a decal on the mower deck showing how the belt is routed. I can't say exactly how to route the belt since I don't know what mower you have. Ours had the decal and there was a sketch in the manual.
  • Loosen the keepers at the drive pulley and pull the belt down and off.
  • You may have to disconnect a side of the mower deck.
  • Slide the belt back on as per routing instructions.
  • Put the belt keepers back exactly how they were before.
  • Watch out for idler wheels and make sure the belt is on the correct side.

Tips & Warnings

  • With the belt under stress (engaged and in gear but tractor not running) the guides should not touch the guides. Disengaged, they will touch them; that's what keeps them from falling off.
  • I am not a mechanic. I was given this advice by a mechanic. It's best to have your manual with you while you do this. DO NOT TURN THE MOWER ON WHILE YOU ARE REPAIRING IT!!!
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