I got a hydro-Z for free, i did about 400$ worth of work and everyting seemed to be in line for the past few weeks when i was using it. but now all of a sudden the mower is having a hydrolic issue. both sides feel as though they have no power, and the belt squeaks when trying to go foward and same in reverse but not quite as bad. I dont know where to start but it just seems odd that both would go out at the same time, i dont know how long it sat but that could have been a problem too, the belt seems a little loose, how much tension should be on it? Any insight would be useful, even if it is just an explanation on the mechanics of this system.