Question about Craftsman 20 Hp 42" Deck Lawn Tractor

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Uneven blades The blades are uneven.  One goves a closer cut than the other.  How do I put them at the same height?

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You mave have to put some shims or some sort of spacr under the one that is up higher to bring is level with the lower one

Posted on Sep 15, 2008


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Left side is scalping especially when turning

Stephen Bent/damage blade or spindle, check your deck for support link pin missing, damaged or rusted out brackets, blade spindle loose/mount damages or rusted out, missing deck support spring,wheel/roller if equipped, damaged blades, Recheck tire pressure and front steering axles for bent/damage, etc.
When measuring deck for level, measure at blade tips not the deck on a flat level surface. Check the attached links,instruction and guides, Good luck
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."
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Blades cut unevenly. unable to adjust

bent spindle or bent blade or loose blade

Jul 23, 2015 | Garden

1 Answer

Uneven Cutting with my Zero Turn 50"...Possible Causes?

First is being sure all your tires have proper air pressure and you don't have a bent blade. Then while parked on flat concrete and both outside blades at 3 and 9 o'clock measure blade height far left side of deck and far right side and compare. I there is a difference the entire deck is out of level and should be adjusted. Then remove the blade drive belt from one of the pulleys so everything is slacked. Grab each blade and see if it wobbles or has excessive play and check the spindle housings for cracks or breaks. If you find a housing with wobble or play the bearings in that spindle are shot ( this is a lot harder to detect with the belt tension on the pulleys) and should be replaced. If you find a broke or cracked housing the housing will need to be replaced. Either one of these situations may not be obvious with the mower at rest but the blade will wobble at speed causing uneven cuts.

Aug 25, 2014 | Garden

1 Answer

The accelerator pedal is not working properly. Especially when trying to go up hill. I have to keep pushing & letting go, pushing & letting go. even when it starts to move. Also, the right blade...


I am guessing that this was posted in wrong category.

You mention that you have to keep pushing / letting go of the accelerator. Is the engine RPM changing, or is the tractor surging, when you do this? What happens if you keep a steady pressure on the pedal? Isn't the throttle control via a lever on the panel?

Your uneven blade height can be caused by a multitude of issues.
1) If the spindles were changed, the wrong spindle may have been used on one side or the other.
2) The wrong blade adapter has been used on one of the spindles.
3) Mower deck has been bent
4) Mower deck is binding. Try raising it all the way up, and lowering all the way down. See if the uneven cut changes at both levels (all up or all down).
5) Blade is bent on one side, though this would usually cause such a ruckus and vibration it would be quite noticeable.
6) Belt is slipping. Yes, sounds strange, but if blade speed changes significantly, then the position where the grass is actually cut changes because the grass can "lean over" more.
7) Using a mulching attachment in tall grass can cause 1 blade to clog, and the cut grass that is swirling bends over other grass that needs to be cut.
8) Mower deck support bracket has been bent
9) Mower deck wheel has a bad bearing, and doesn't support the deck at same height as other side.
10) Mower deck is cracked / bent at a support location
11) You have lost a retaining pin at a support bracket and the bracket is loose.
12) A spindle's bearings are worn out, and the spindle is "jumping" as it turns.

If the blades are directly beside each other where they blades will overlap, it is normal for a small amount of height difference to occur. But, most decks have off set blades, one slightly in front of the other.

you should be able to raise the deck all the way, and pull the tractor's front wheels up onto something (landscape timber?) to get more access, then measure blade height in relation to bottom of the deck. If different, then you are looking at wrong blade / adapter or a spindle issue. If the blades are the same height, then you are likely looking at a deck support issue / binding in linkage.

Aug 25, 2010 | Craftsman Garden

1 Answer

I had hit a somewhat hidden stump on the lawn..bending the blade. Took the deck off and replaced the bent blade. Put the deck back on and now the cut seems uneven. It appears that the deck is now...

I've only had luck removeing the deck, turn it upside down. Measure blade, mark, remove blade, insert large pipe over spindle, bend in direction. Re-install blade, and do it all over and over till straight. Measure in several locations.

Aug 18, 2010 | Craftsman 20 hp 42 in. Deck Yard Tractor

2 Answers

Cuts uneven, lawn looks terrible. Missing half

Are your blades upside down? Mower deck level?Proper air pressure all 4 tires?Correct blades for the diameter of cut? Deck bent? Deck hangers bent?

May 28, 2010 | Garden

1 Answer

I have a Craftsman 42" rider cuts uneven

Check your tire pressure first, uneven tore pressure will cause this problem.On the rear of cutting deck on both sides there are height adjustments, if your deck has a rear roller this also can be adjusted to compensate,If your a stout person sitting on tractor can cause unevenes.

Jun 25, 2017 | Craftsman 42 in. Deck 19.5hp Lawn Tractor

1 Answer

Uneven cutting height

Hi Matt,

Thanks for the update. Good ole brainstormin' comes through again!


May 07, 2009 | Craftsman 21 hp 42 in. Deck Yard Tractor -...

2 Answers

I sharpened the blades at the end of last mowing season. The next cut was very uneven, so I checked to make sure that the blades were installed properly and re-leveled the deck. The last cut was even...

The problem you discribe is the classic broken blade spindle or quill. The tube that supports the bearings between the deck pulleys and the blades is almost certainly broken. Look under the deck [mower OFF] at the piece right above the blade that is malfunctioning and you will probably find a bad bearing or a chunk of the tube that holds the bearing/blade to be missing. That happens when the blade gets 'wacked'. The outer edge is cutting too high because the belt is pulling the shaft toward the center of the deck. The quills are fairly easy to replace. Get the model number off your tractor before you go to buy the part.

Apr 04, 2009 | Craftsman 42 in. Precision Cut Plus 24hp...

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