That's why there's a pressure regulator on the pump. You don't have to blast everything at max psi. No. IDK, haven't had any problems. It is a triplex, so there shouldn't be any issues. The pump is rebuildable, though. And, JD pressure washers are made by Mi-T-M, which are some of the best in the business. Not exactly sure as it's being stored elsewhere, but, no more than ~2ft.