Thanks for all the nice comments. When I tore the jack down, I found that it was very heavily worn. Obviously the hydraulic unit had seen better days. The handle was bent and the yoke pivot pin and pump pins had a lot of play in them. The rear castor bearings were toast and the races were heavily worn. I also discovered a cracked weld at the lift arm pivot point and the frame was bent, I suspect from taking a very heavy shifting side load. After finding all the defects with this jack I almost didn't want to go forward with the project.

I had help from a lot of friends and new acquaintances. My son and I tore it down, cleaned and degreased everything. The frame was split, straightened and the cracked weld at the lifting arm pivot point was repaired and the handle was straightened. All of the hard components went into an electrolysis tank for further cleaning. I had new attachment pins fabricated for the handle yoke and the pump. New 1/4 " ball bearings and a thin machined washer place under the lower races brought the rear castors back to life. The hydraulic unit was rebuilt and load tested by a local shop. And finally, an etching primer and a single stage automotive acrylic enamel paint with multiple coats and wet sanding between coats was used to refinish it.

For me, it came out better than expected, but it's not going to become a museum piece, just a really nice and useful tool for myself and my son.

Hiball is currently on the look out for a set extension/retraction springs to complete it. Hopefully, he will be able to help out.