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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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.

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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

1 Answer

42 inch jd la115, hit stump in yard, changed blade cause I thought I bent the baldes still cuts uneven. Could the shaft be bent or broken? It appears to be cutting properly on the right side but the left...


try pushing the blade up into the deck,,,if there is any lift in it there is the fault,,the top nut has come off the blabe drive pully and let the drive shaft drop a little this will lower the cutting blade,,,fix it before the blade falls right out

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3 Answers

My mowers cuts uneven I replaced the blades but it still cuts uneven how can I level it?


Park mower on a level flat surface ( a concrete garage floor is ideal ) lift deck up until you can put a piece of a 2x4 flat underneath the deck and lower deck until it just contacts the 2x4. loosen adjustment nuts or turnbuckles and adjust until the deck just starts to clear the 2x4. this should level your deck. Now , lift the deck and remove the 2x4. put blade height lever on a known cut length and with a tape measure, measure the tips of the blades from the floor to the blade tip...they should all be the same within 1/8 of an inch...if not then you either have a bent blade, bent spindle shaft, or spindle bolts are loose or misaligned. Your deck could be warped too...depending on how hard a lick it took...good luck !!! ;-D

Jun 24, 2010 | Craftsman 20 hp 42 in. Deck Lawn Tractor -...

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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?

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1 Answer

Sears Tractor Mower 42" is cut cutting lawn in two uneven strips


First, check the blade, it may be bent. If not, there is an adjustment nut (9/16) on each side in the middle of the deck hanger bracket. Get on level surface and screw each up or down to get blade tips the same height on each side.

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1 Answer

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Hi Matt,

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

Charlie

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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.

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