My Craftsman 42" lawn tractor

be sure tire pressure is the same
check guide wheel heighth

Check your blades common problem with uneven cut is a bent blade. Next find a level spot like a padio and take a torpedo level place it on the front center side to side not front to rear. On one side or the other you should see a J(jay) bolt with a nut tighten to raise losen to lower.

Terry

deck needs adjustment

Several things here could be the problem. Check to see if mower deck is level, measure distance on both side on a level surface. Check tire's for low air. If you've replace the mandrel's lately, some have a left & right side & if not put back together properly this will cause uneven cutting

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.

I have seen dull blades, blades not installed right and an un-level deck cause that.

Hope this helps.

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.

Was it cutting uneven before you changed blades? If so, you may not have gotten the blade on the shaft correctly. There is an adjustment in the center of the deck hanger on each side. You can turn the 9/16 nut up or down on each side to level it out.

Either the deck is uneven or one of the blades are upside down

http://www.managemyhome.com/mmh/lis_pdf/OWNM/L0104113.pdf