bad sausage!

"Attach the plow to the 3 point hitch. Drive the tractor's left rear wheel up on a 6 inch block. use the right hand leveling crank and the top link screw adjustment to level the plow share and the land slide with the ground. Do this on a good level spot or on a level slab of concrete. Pull a string from the back of the land slide to the front of the tractor or futher out in front of the tractor and make a stright line beside the land slide to the front of the tractor.The line should angle slightly to the right front wheel of the tractor about 6 inches more than the left. This is to assure that the plow doesn't try to turn the tractor right when the plow comes in contact with the earth. Think of the plow acting as a rudder would on a boat. The way to adjust the angle of the landslide to the left is to loosen the bolts that hold the drawbar that goes across the plow and attaches to the two lower links and twist it in it's cradle untill the plow is pointing in the right direction.(string pointing to the right at the front of tractor) The plow will have to be raised to let it more easily be moved. Some plows have adjusting bolts that help in turning the plow and in sequering it in position. This is just a premilary adjustment and when in the field it may be necessary to tilt the plow slightly forward by shortening the top link etc."

I also agree that you may have been going a tad slow. N's were designed to be able to pull all day in second gear...