Last wednesday a small branch with my mower and I broke a small Oring on the hydraulic pump. I took off the hydraulic pump and I went to the dealer and they changed me the shaft seal on one side and the hydraulic pump on the other. Yesterday I took on the hydraulic, and I tried the mower. I can go forward, left and right but I can barely go backward... Is someboy know why? I need this mower to run so bad... Thanks!