Your probably fine as for not needing new hydro pumps. Just fix your leaks. I had a leak on my scag with only 10 hours on it. o-ring failed, and replacements kept failing after a week or two. Dealer was no help, bunch of jerk offs and I wont buy from them again. Tried putting me on a waiting list of over a week to fix my brand new mower that I need daily. No offer of a demo unit to use in the mean time. I finally got it to stop when I put in a new O-ring and sileconed the crap out of the surrounding area after installing the line back. Not pretty but hasn't leaked since.