my 23 52 hp has 150 hours on it and the pumps seem to be getting weak. more noticeable on inclined turn arounds. it definately wasnt like this when new. any one else or any suggestions. i have an older one with 900 hours on it and is on the 4th hydro belt. what else could it be besides a loose belt or air in the system.. once you get turned around and rolling again nothing feels wrong with it. Im not a fast/agressive operator but aint no slo poke either. WOT all the time.