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Manage My Life
Tractor Mower Deck adjust tension on drive belt
by Manage My Life 
July 26th, 2013
Manage My Life
There isn't really an adjustment for this. Most likely, the cam rollers are sticking and causing this to happen. Check on the inside ends of the brake mandrel brake arms (on the bottom of them) and you should find a roller on each arm. Make sure those little rollers spin freely by hand. If they do not, take them off and clean them up. If the rollers are worn or have flat spots worn in them, you will need to replace them.





If the rollers are okay then the problem is most likely with the pivot that moves when you engage the blades. When you move the lever to engage the blades, watch the deck and look at the small idler that moves. Where that idler arm pivots can get to where it does not pivot and this can happen.





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by Manage My Life
July 28th, 2013
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Manage My Life
How do I tension (adjust) mower drive belt for a Craftsman II riding mower model 917.257290?
by Manage My Life 
July 6th, 2008
Manage My Life
This particular model manual is currently not available electronically through Manage My Home. But it can still be ordered through

Sears PartsDirect

or your Sears Store using the part number 137642.

The mower blades on this model disengages by loosening off the belt until it can slip, so it normally will be loose unless the blades are in use. But if your blades are slipping during cutting then the belt might still need some attention.

Some models use a cable to engage the belt but this particular model uses metal linkages to move the tensioner pulley assembly into the belt and take out the freeplay. And that linkage hooks directly to the engagement lever that you use when turning on the mower blades. So there is no actual adjustment points as there might be on some other models.

Unless a link or rod is bent or very badly worn or damaged in some other way, there is not likely to be much added play introduced into the belt from the engagement linkages themselves. But, as belts wear they do lose material and stretch somewhat and eventually that will make them run looser than when new. So, if the belt is slipping, it is more likely the belt itself is too worn to grip the pulleys properly and the belt will need replacing.

Looking at the parts

image below

from the PartsDirect site, the mower drive belt is shown as

item 20

, the tensioner pulley is

item 35

and the engagement lever you use to turn on the blades is

item 53

. The linkage rods and arms that connect the lever to the tensioner assembly are shown as

items 49 and 54

.

Even if it is the belt at fault, you should still check the movement of the lever and linkage and tensioner assembly just to be sure nothing is out of place or seems excessively worn or difficult to move.

And look over all the pulleys carefully for any signs of excess wear or dings or bends that might make it hard for the belt to grip or run straight. Often a dragging pulley due to worn bearings can also contribute to belt slip, so once you have the belt off check that all the pulleys on the mower deck spin freely and smoothly.

If you have any other questions or concerns, or this does not address the issue you had, feel free to submit another question here at Manage My Home and we will do our best to help further. Or, you can call

1-800-4MY-HOME

(800-469-4663) to see what options there are in your area for having the unit inspected and repaired by a professional.
by Manage My Life
July 10th, 2008
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Manage My Life
How do I adjust the mower blade drive belt tension on the Craftsman 917.271071?
by Manage My Life 
August 19th, 2011
Manage My Life
the model no is 917.289031 of my craftsman LTS 1500
by Manage My Life
August 30th, 2011
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Manage My Life
how to adjust belt tension on mower deck
by Manage My Life 
July 21st, 2010
Tags: Lawn Mowers
Mark T
The mowing deck is engaged mechanically. When the lever is moved, it pulls on a cable that is connected to the idler assembly on the mower deck. With the tractor turned off have someone move the lever back and forth. You should be able to see the idler arm move and tighten the belt. If the cable is not broken most likely, the idler arm is rusted. I recommend removing the mower deck and loosen the idler arm-mounting bolt. I have pointed to the bolt with a red arrow. How soak the pivot with WD-40 and work it back and forth until it is loose. Then retighten the bolt and make sure the idler still moves. If the idler is freed up, reinstall the deck and test. If the mower is still not working correctly, I recommend replacing the deck belt. If you need further assistance, please resubmit your question.

If you do not feel confident repairing this problem yourself, then you can have it repaired at your home by a Sears technician. Here is a link for the website:

Sears Home Services

.

Here is a link to buy any parts you need.

Sears Parts Direct

.
by Mark T
July 23rd, 2010
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Manage My Life
How can I adjust the tension on the drive belt of my Craftsman lawn tractor.
by Manage My Life 
February 14th, 2008
Manage My Life
There is no adjustment for the drive belt tension on your lawn tractor. There is enough play in the idler to take care of normal belt stretching without adjustment. If your belt is slipping it may be worn out.

If you have just replaced the belt, look closely at the routing instructions on the fender of the tractor. You might have routed it incorrectly.
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by Manage My Life
February 14th, 2008
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Manage My Life
adjust drive belt tension lawm tractor model 917270653
by Manage My Life 
November 15th, 2010
Manage My Life
Check the belt to make sure it is on each of the pulleys. Once you're sure that it is, check the spring on the clutching idler to make sure it is not broken. The bracket for the clutching idler pivots and should be able to move and back and forth when the clutch/brake pedal is moved.

I have attached a drawing of these components. They are located on the front right side of the tractor.

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Answered in 2 hours
by Manage My Life
November 15th, 2010
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Harry Wong
craftsman lawn tractor drive belt tension
by Harry Wong 
May 9th, 2012
scott d
Thank you for your question. I understand your concern about the belt. This belt will be loose until the idler spring pulls tension on it. Make sure the idler spring is not broken or loose. I'm also attaching a picture with instructions showing how the drive belt should be routed. I hope this will help you.
by scott d
May 10th, 2012
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Manage My Life
How do you tension the blade drive belt on a 33" Craftsman walk behind mower Mod 247.887330?
by Manage My Life 
May 12th, 2009
Manage My Life
I don't see any adjustment on that machine so I would think that the cable might has stretched some. That may have an adjustment on it. I cannot find a clear enough photo to know for sure though.
Answered in 21 hours
by Manage My Life
May 13th, 2009
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Manage My Life
Craftsman mower drive belt
by Manage My Life 
July 4th, 2013
Manage My Life
The nut is on a bolt that comes from below on the idler arm. You'll need to use a wrench on the bolt head (under the idler arm) to act as a "back-up" to remove the nut.





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Answered in 3 hours
by Manage My Life
July 4th, 2013
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Manage My Life
how to adjust belt tension.
by Manage My Life 
June 18th, 2013
scott d
Thank you for your question. I'm sorry you're having this problem with the trimmer. Unfortunately, there is no adjustment for the belt. If it seems loose, check the spring on the idler assembly to see if it's stretched and also the make sure the idler is able to pivot and is not binding. If these checks are ok and the belt is loose, it would lead to a possible stretched belt. I hope this will help you.
by scott d
June 20th, 2013
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