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

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Mower won't start

I was mowing some thick grass one night with the deck on the 6th level. I wanted to get the grass a little shorter, so I moved the deck to the 4th level. As soon as I did so, the mower shut off. The next day, I tried to crank it. It clicks and has sort of a humming sound, but won't turnover and start. I have no clue what might be wrong with it. Checked the battery, fuel, and spark plug. All were in good shape. Any suggestions?

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How did you check the battery ?
It sounds like its a bit short of power to crank it over..
Try jumping it from a car battery..

Posted on Jul 24, 2009

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Inspect the under side of the deck for grass build up. You need to clean it about twice a year if you are mowing damp grass.

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Why does it bog down in grass maybe 6 " high?


The likely cause of this is that the grass is too high for your mowers deck. You should try just mowing about 1/3 of the blade at a time (if you can) until you reach your desired length, so if you grass is 6" high, only take off about 2" at first to reduce the stress on your mower. Set your mower deck to it's highest setting and give it a shot.

Also, be sure that the blades are sharp, and if you don't have mulching blades, you should get some! Grass this high will leave long clippings on the lawn which can suffocate the grass, mulching blades will chop up the clippings into smaller pieces, which is beneficial for your lawn!

Finally, make sure you aren't mowing wet grass. If you mow when the grass is wet the clippings can stick together and clump up under the mowing deck which will cause excess strain to the mower and maybe even cause it to shut off.

If none of this works, you may want to use a string trimmer to remove the first two inches of your grass and then continue mowing as normal!

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Your mower doesn't have enough power to handle very thick grass at high speed. You need to go slower across the lawn. That's easy to do if this is a push mower (just don't walk so fast) or if it's a self-propelled model with a speed control. But if it's a single-speed model you'll have to mow the lawn in fits and starts: squeeze the lever to move it forward; release it when you hear it bogging down; wait for the motor to reach full speed; squeeze the lever to move it forward again; repeat. Also, is the grass very high? If so, try setting the cutting height higher on the first pass, then lower it for a second pass. Finally, make sure the blade is sharp.

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