Question about Craftsman 20 Hp 42" Deck Lawn Tractor

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A row of uncut grass left between blaces when mowing

I recently replaced the blades on my Craftsman LT 1000 riding mower 42'' cut hoping it would fix my problem. It did not. When I mow it leaves a row of unmowed grass down the middle. What is the problem?

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THE answer that FINALLY worked for me. Torque the bolt that holds on the blade to the recommended torque specified in your owners manual (for my Exmark this torque is 120 ft-lbs). When I first used the torque wrench, i was quite surprised by the amount of addional force I needed to apply to reach 120 ft-lbs Exmark blades have a round blade hole with a washer and therefore, relies only on friction provided by torquing bolt to the proper torque to prevent slippage so that the blade rotates at the same speed as the spindle. When slippage between the blade and spindle occurs, blade tip speed slows leaving uncut grass.
Note: this solution will NOT work for mowers with a blade and spindle design which uses a positive means (e.g., a star shaped hole on the blade) that assures the blade rotates at the same speed as the spindle with no slippage.

Posted on May 15, 2012

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Mowing too fast for the blade speed. Use higher engine speed or lower gear.
One or both blades too short?

Posted on Jun 16, 2009

  • jim horton Jun 16, 2009

    Mowing too fast for the blade speed. Use higher engine speed or lower gear.

    One or both blades too short?

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1 Answer

2008 craftsman lt1000


you need a govenor adjustment take it in or or your waiting to long to mow grass slow down when you mow or mow more often

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Left blade is on backwards (liftng edge is contacting grass). Try reversing the blade on the left side.

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The riding mower doesn't cut evenly...one side cuts higher than the other...


The following steps will make any riding mower cut evenly.
1. The rear tires must be the same diameter i.e. same tread type and the same tire pressure (check it before each mowing).
2. Level the deck following the instructions in the manual and recheck it occasionally
3. Make sure the blade(s) are not damaged and kept sharp, rounded blades tear instead of cut.
4. Make sure the deck and its attachment points are not bent or damaged.
5. Drive at a slow walking speed with the engine at cutting speed.
6. Over lap rows in amounts sufficient to lift and cut the tire tracks from the previous pass.
7. Cut the grass at intervals that ensures you never have cut more than 1/3rd the total length of the grass.
8. Make sure the underside of the deck is clean.
9. Use a blade style that matches the type of grass you most often mow.

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I have a MTD Pro riding lawn mower that I


the only way to fix it is fit the right blades
they have fitted the wrong blade's to it,,,
the blades should overlap when cutting the grass they cannot crash into each other as there are (timed up) not to do that the new blades they fitted are to short so you have no over lap on the gutters that leaves a strip of grass left uncut between the blades,,
call them out to put this stupid mistake right,,,

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1 Answer

I have a Craftsman Lawn tractor. Blade leaves grass uncut.


Hi Tom,
Check your spindle shafts for loose play. If your bearings are worn out and sloppy, the belts pull the spindle to one side and an angle cut results... close cut grass at outer edge and high in center will leave this grass trail you are describing. I'd replace the bearings next year for sure.
I hope this helps... Good luck!

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42 inch craftsman. Replaced bades and now have a row of uncut grass in the center of cut.


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Problem mowing my lawn.


I had the same problem and I already found those recommended solutions\ causes on the web:
1. The motor isn't on full throttle.
2. The blade is upside down.
3. The grass is too high when cutting it.
4. Overlap your cuts.

It helped my problem/ I hope it will help yours too!

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