power steering pump seal blowing out....5 times now

still no luck. i replaced the power steering pump and high and low pressure line. they needed it anyway. the pump had alot of play. i then replaced the seal again with anew one. this time i drove it in with the washer on top of it. i drove it until it barely cleared the snap ring line. the snap ring went in tight because it was so close but it did seat. The outcome of all of this.......................it leaked worse than usual! the seal is going in with resistance. there is nothing else i know of to do