Loss of power steering.

[DangerRanger99xlt]

recently replaced the power steering pump, power steering pump pulley and serpentine belt. Power steering felt great there was no noise form the pump anymore and was very smooth with the fluid looking great. This last weekend I was backing out of the driveway turning my steering wheel counter clockwise almost to lock and hit a dip where my driveway meets the street which caused the wheel to jerk all the way to lock and bounce off of it. Immediately I had no power steering any more and struggled to get it back into my parking spot. Power steering pump isn't making any weird noises the serpentine belt isn't slipping and fluid still looks great in the pump. I jacked it up and the power steering works great with the wheels off the ground but as soon as it has load on it there is no power steering even higher RPM on road there is no power steering. By no means am I a mechanic so any help would be amazing. If you have any questions just ask please.