Question about Craftsman 21 Hp 42" Deck, Ys 4500 Lawn Tractor

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Sears Craftsman rider mower bought in 2001. Still runs really great. However, lately it will not cut the grass when I lower the deck to positions 1-3; the blades seem to stop; no cutting action at all. As soon as I lift the deck to the 4 position, the cutting starts. But, as you can tell, it leaves the bulk of the grass stalk. Constant recutting. Too much time and hours on the machine. Troubleshooting please.

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Check pulleys-belt -tensioner and mandrels

Posted on Jul 25, 2017

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Do the blades need sharpening? Check the belts for tightness and the spring that holds the tension. what stops? The blades stop, but the belt is still turning? Check to also make sure the blades turn freely with the belt disengaged. you may have a spindle problem too.

Posted on Jul 25, 2017

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Posted on Jan 02, 2017

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SOURCE: craftsman 42" riding lawn mower blade free spinning but wont cut

It sounds to me that you need a new mower deck drive belt, or your blades need sharpening. If the blade edges are rounded, they won't cut butter... Also, when mower is off, check mower deck drive pulleys to make sure you don't have any that are locked up or are dragging. You can check this by pulling the belt away from pulley and spinning the pulley by hand. MOWER MUST BE OFF before attempting any of these checks. You would be surprised how many people would try this with the mower running.
Hope this helps

Posted on Mar 11, 2009

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SOURCE: Craftsman 17.5 HP 42 in mower stops after approx 1/2 hour of use

I have an 18 HP B&S 42" Craftsman with the same problem. Carb has been rebuilt and fuel filter replaced. Have cleaned the vent hole in the fuel tank cap. Nothing has helped. Choking the throttle will keep it running for a few more seconds but it eventually stalls out only to start again in 5-10 minutes which keeps me thinking its a fuel, not electrical problem. Maybe overheating but how can you tell if its causing vaper lock?? Submitted by Redroadster.

Posted on May 03, 2009

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SOURCE: Craftmen mower doesn't cut well on right side

Sounds like you may have made a common mistake, getting one or both of the blades upside down.

Posted on Jun 28, 2009

  • 32 Answers

SOURCE: How do I get my mower deck set properly? Any tricks?

check your front tire air pressures







Posted on Jul 26, 2009

jagjeffery
  • 318 Answers

SOURCE: Craftsman DGS6500 with 54" precision

The only thing that makes sence is that some how te blades are the wrong ones they are not long enough . raise the tractor up set the blades so they are in line with each other they should not have more then a 1/4 inch gap if it's more you have the wrong blades.

Posted on May 23, 2011

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1 Answer

I have a Craftsman SL3500 42" riding lwan mower. the two blads make uneven paths ans the left blade makes a cut about 1/4" lower than the right blade. What do I do?


You should be using a up lift blade it will help by sucking up the grass to be cut. You should have an adjust on both sides of the blade deck . As for the strip check to see if you have a wheel behind the mower deck. If you do it might be the cause for mower leaving a strip uncut . Sears has been noted for putting wheels in the path of the blade area and smashing the grass down . That is also why I suggest to use an up draft blade it should **** the grass back up again so you can cut it.

Oct 07, 2013 | Craftsman Garden

1 Answer

I have a sears craftsman rider..model #917.527643, I cannot lower the mower deck to the ground. Any suggestions on how I may fix this problem?


I could not look up by model number. You have the right number of digits, but the sears craftsman parts site would not recognize it. So I am guessing that you have a knob that the operator can reach under the steering wheel and lower and a little left. If you have one of these knobs, it is a deck lower limiter. It is easy to turn if the deck is fully up. If the deck is lowered to bottom and the deck does not go to bottom and you turn this knob you will feel significant resistance. This resistance is caused by the weight of the deck on the limiter. With the deck fully up, turn this knob to fully lower the limiter and then lower the deck. Should go to ground or just a hair higher.

If any questions, please send reply and I will get back to you.

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Jul 14, 2011 | Garden

1 Answer

The belt that comes from the engine to mower deck keeps breaking. I've owned the mower for years and I have to buy atleast 12 belts per year. The problen is really bad now. A belt per cutting. I've...


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.

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1 Answer

The mower just stopped dead.


clean and tighten all connections from the battery to the starter and selenoid connections too

Jun 03, 2010 | Craftsman 17.5 hp 42 in. Deck Lawn Tractor...

1 Answer

Craftmen mower doesn't cut well on right side


Sounds like you may have made a common mistake, getting one or both of the blades upside down.

Jun 28, 2009 | Craftsman 21 Hp 42" Deck, Ys 4500 Lawn...

2 Answers

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Ihave craftsman Lawn Tractor was cutting grass and it stop moving forward or backward. Can you help me

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