I have a 2000 Grasshopper 614 that I recently bought from a guy. No hour meter but seems to have low hours, starts well, doesn't burn oil. The mower had been running fine until the other day it started just fine but for the first minute or so the hyrdos seemed very slow. Max speed maybe 2.5 mph and it sounds weak as well. After a minute or it seems to drive OK. Already planning on changing hydro oil and filters since I don't know if its ever had a hyrdo oil change. Would the oil and filter change help with my problem? or am I missing something else? Maybe a problem getting power from the engine to the hydros? Any help is appreciated.