I have a 856 that will not move with a load. When I let out the clutch peddle the tractor does not move for a second or two, then it will drive ok with no load. I put a new clutch in, I changed the trans filter, and I changed mcv pump(where I got the pump they only had the gasket to mount the mcv valve to the trans, so I did not take the mcv totally apart, but I did pull some off the springs and they seemed to be fine) It is the same with the TA lever forward or back. I thought the TA would not slip in direct. I added 5 gal hyd, it is a little over full. I pulled the filter thinking I may have pluged right away, but It didn't look pluged. The oil probbably could be changed but I dont think that is the problem. Any help will be appreciated.