Different mowing conditions require different set-up adjustments..
In very heavy, tall grass, you need the rear much higher than when doing finer work. The mower must be able to toss the cuttings out quickly in heavy/tall grass/weeds/saplings.. There are times I have the Rear more than 6" higher than the front on my 6' Bush Hog, when in big stuff and almost level in short.thin stuff.. Mine is a Pull-Type..use it on a '52 JD "B"..