I have an Exmark Zero turn rider. When I slow down the right side hydro to take a right it is slow to respond and then all of the sudden the right wheel will briefly lock up. Its getting hard to control. The hydro fluid if full and I changed the filter 2 months ago. I had always heard that a hydro pump fails completely when it dies - there is not a slow death. I only use my mower on my 2.5 acre yard - I do not mow for a living - I have about 10 cuts at 1 hr a cut on the mower after I changed the filter and fluid. Does any one know what is happening - Can I fix it or do I need to buy a new pump for the right side?