I have a brand new FF12 mini excavator. It seems to have a problem with strength-of-hydraulics, most especially in the treads. It started out super herky-jerky powerful like it wanted to buck you off, and now after about 6 hours of use, it barely wants to move its own treads on a flat surface...
I have a new FF industrial F12 excavator looks to be the same as the H12 excavator. I recently had a job working in a lot of mud, and after working, decided to go, wash the excavator off and after doing so the excavator stopped been able to spin or rotate. Now it appears to have no power at all...