Uneven grass cutting

I have a Craftsman 21" ...still small clumps of tall grass.
Are you mulching or discharging the grass? In the dead of summer, sometimes the grass is just too thick for mulching. Not necessarily too tall but too thick. Blade tip speed is everything. There is also different blades for different applications. If you are not mulching you want a high lift blade. Here is a few blades that show the difference
21 mulching blade with star center
MULCHING TOOTHED BLADE / HUSQVARNA 532 13 89-71
21 mulching blade with round center
MULCHING BLADE / AYP 406712
21 High lift blade with star center
HEAV-DUTY BLADE / AYP 138971
 
I would check the body itself. I was havin this problem with my rider and found the deck bent. Big hammer fixed it. Good Luck.
 
Is it a 1 touch adjust (adjusts the hieght with one lever) If so, it sounds like something is bent causing it not to adjust evenly. If its a seperate hieght adjuster for each wheel, check to make sure they're all on the same hieght. If that doesn't fix it, put it on level ground (pavement preferably) and measure the 2 sides of the deck, they should be the same hieght off tthe ground, if not, it's a problem with the wheels or adjusters, if the hieght is the same, it's a problem with the blade setup.
 
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