I have a 3 year old Exmark Lazer Z (60inch). Worked on all of my mowers including this one and got it all cleaned up and freshened up within the last month. I start to use it regurally this week and last as the weather started to work out and the grass is growing consistently. Today my 600 hour Z lost the left side hydro pump. Just went out going down a hill and well, wow it was an interesting experience when it lost control and theres a tree! I can buy a new "hydro-gear" oem brand for $379 or a generic one "Viper" for $199. Im also aware there are some rebuild kits out there for cheap? The seals are $15.99 but im not sure about what internal parts a rebuild entails. The problem is the main seal behild where the belt pulley is went out and is pouring out hydro fluid. I was told by the local shop when I called asking for just that seal that if that seal went out there are bigger issues to worry about. The unit worked fine until today when it went out. So I guess the question is, do I replace it or rebuild it? Down time is an issue since I have grass that needs to be cut and am down a mower. I dont want to spend unnecessary money if I can just rebuild it and all but if its going to be a better route I will. Figured id ask you guys and all before I call around for part availabilty and prices. Also I dont know if my local supplier wants to make a sale on a pump by telling me mine may be dead and not just the seal or if thats legit. Ive heard they are relatively simple to rebuild but have yet to tear into one. Ideas and input would be great! Thanks for your help.