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Craftsman tractor 917288562, the mower belt comes off constantly, fouls the pulleys and breaks, I am replacing in it frequently. The belt looks to big -even though it is the correct belt -why? Thank you, Robert.
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Which belt? If its the deck belt, you could have a siezed bearing on one of the pulleys or possibly a pulley break or belt protector is out of adjustment.
The tension on the Idler Arm or the proper belt tension is incorrect. Make certain it is the correct belt and it must fit tightly or else the problem with pop up every time. There must be physical adjustments you can do to get a tight belt.
I HAVE A CRAFTSMAN 18 H.P. 3 BLADE 46" MOWER DECK. 1. THE PLASTIC PULLEY COVERS ON BOTH SIDES OF MOWER...WILL TRAP STICKS AND DEBRIS WHICH VERY RAPIDLY WEARS THOSE BELTS..I REMOVED MINE IF IT IS RUBBING: 1. EITHER THE BELT HAS STRETCHED-REPLACE 2.THE SPRING MOUNT (WELDED TO DECK) GOT BENT...STRAIGHTEN
I own a Craftsman rider, DTY 4000, 25 HP Kohler, 48" cut, 137 Hrs. It eats a belt about every mowing or two. Did all the stuff you did. Good luck from Sears. Had cousin who is owns a lawn & garden repair business look at it today. Says the prob. is this - The drive belt pulley (elec clutch) has too a narrow "V" and the angle of wear between it and the deck when the deck is in the lowered (mowing) position is too severe. If you notice with the deck in the fully raised position the pulleys line up perfectly. Then drop your deck and see how tightly bent the belt is downward and it makes sense as to why(my) belt would first roll over then break in a few minutes. The elec clutch pulley is sold as one unit PT No. 179334 $250.00, but I'm sure it would come with the same narrow V pulley. Waiting for word from my cousin. My last Sears Mower. Cannot even sell it in good faith.
check for belt wear *(the edges of the belt look frayed or scrubbed down?) and also look at the belt tensioner for wobbly/loose pulleys.
With the engine off have someone move the engagement lever while you look underneath at the belt to see which pulley is taking up the belt slack so you can then determine if this pulley has any issues.
If this mower is fairly new it is probably just belt wear. New belts are typically 20-30 dollars to replace. Less any labor.
Take a look at how the belt is installed. Then you will have to remove the mower deck and belt from the pulley on the engine. There is probably something by the engine pulley that you will have to remove so the belt will come off. It might be a shoulder bold or a rod with a bolt holding it on. Same with the rear pulley. Then you just have to put the belt on one pulley and watch your fingers so you don't pinch them and turn the other pulley and the belt should go on. reinstall any bolts you removed and install the deck.
you remove shield from engine remove belt, remove deck from mower and remove pulley guards and install belt replace guards , reinstall deck, put belt on engine pulley replace guard
Look at the Idler pully on the deck ther should be a Spring that keeps tension on the belt if it does not have that feature on that deck then there is a stay pin missing or the belt has just gotten to big (streached)
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