my dad has a 6000 uses it for blowing snow and mowing grass. it has a bad leaking front trans seal it still works ok would it be worthwile to replace the seal? im sure some damage has been done to the selct o speed. the brakes and 3 point arent working, the power steering is. I think they all run off the hyd pump on front? is there a place online where I can see a hyd schematic? any advice would be appreciated. how hard is it to fix a select o speed?