My loader is a B-219 SN 3631. It came off of a gear drive 4x4. The loader is self contained with its own pump and tank. It is a 2 lever control. All of the parts are with it except for the plate that bolts over the pump which is a guard to protect from damage. I was planning to make a new one when I restored it. A B7100D according to Tractor data .com is a 4x4 gear drive unit which was not made after 1985 or so. From then on they were all HST. The pump drives off of the crank shaft and is mounted on the loader subframe.