I have an 801 series tractor. It has an extra hydraulic remote under the seat. Would a FEL from a Ford 5000 fit on this tractor and would there be enough power from the remote hydraulics to operate it?

Can't answer either question for you, but there's quite a difference in frame length, height, and width between those two tractors. The 5000 has a lot more clearance over the ground and I would think that sub frame would be hard to fit under an 801.

I look forward to hearing from someone who can accurately answer the questions. Good luck.