855man, I have a 7720 and turned the pump up. You have to lay on top of the motor and lean down while all the blood goes to your head. All in all it wasn't that hard. If memory serves there is a cover you have to remove and there is a jam nut and a screw. I turned it 1_2 of a turn, I can't remember which way you turn the screw. So to play it safe I would call larry, or any one else in the pump shop, at Columbus diesel, in Columbus Ohio. Phone number (800) 818-7867. He was very helpful. Good luck!