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How to change a motion drive belt on a Sears Lawn Tractor?

My model #is 917.28870. Tractor losing speeed in both forward and reverse. Starts slow then will speed up and then almost stop. It is the Craftsman Professional 24.0HP/42"cut, Electric start. Automatic transmission.
My guess is motion drive belt is slipping. How difficult is it to replace?

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Craftsman , Lawn Tractors
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5 Answers from these members:
Manage My Life
Hi, I have a craftsman 917.28726 lawn tractor.. I need to install a new drive belt. The pullys are different that those above. Their are two on the same shaft. The lower one, mower pulley, is much larger than the upper one, drive pulley. How do I get the new belt over the larger one to put it on the upper pully?
by Manage My Life
June 6th, 2012
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Bill W
If the place where you’re testing it out is not a level surface, or if it has inconsistent traction, that could cause slowing down or stopping. But if this happens on a level surface, it’s almost certainly has something to do with the motion drive belt. If it’s not the belt itself, it could possibly be the idlers that put tension on the belt. These are show in the user manual on page 24, parts C and D. You’d still have to remove the mower deck to see if the idlers are the problem. If the idlers were the problem, the bearings inside the idlers would be making a lot of noise when in motion. Do you hear that kind of noise? Either way you’d need to remove the mower deck. If you want to take a picture of the belt path and send it to me I can help explain what needs to be done.
by Bill W Earned 1,209 community points in Craftsman
May 30th, 2012
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Manage My Life
Bill
Could it be anything else than the motion belt? What else should I check?
Thanks
by Manage My Life
May 29th, 2012
Answered in 23 hours
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Bill W
Thank you for using

ManageMyLife

.The belt could in fact be slipping. This type of repair is a very labor intensive operation that requires first that the mowing deck be removed. After the mower deck is removed on the Craftsman Model 917.28870, the next to be removed is the motion belt. I will enclose a page from the owners manual that details how to remove the motion belt ,however, removing the mower deck is pages 21-24 of the owners manual.

Here is the link for the

Craftsman Mower Model 917.28870.

.

If you get to the point where you need to have a service technician diagnose and repair this failure, you can schedule service through this link

:

Sears Home Services

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by Bill W Earned 1,209 community points in Craftsman
May 29th, 2012
Answered in 18 hours
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Manage My Life
Changing the motion belt can be a challenge but not impossible. I am providing a link to the manual for instructions on replacing the belt on your Craftsman tractor. Any additional information, the expert will be with you shortly.
by Manage My Life
May 28th, 2012
Answered in 7 minutes
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