This is a Galion hoist. It had no marks or numbers on it so to speak except for on the triangular arms which lift the bed. Those both said Galion on them. Internally the piston had 6 large steel rings, but the o-rings were in the shafts which turn the lever for the pump flow, either recirculating or turned to force the piston out.
This came off a 1961 Chevrolet 1 ton and I really doubt anything newer then about 1980ish would even have a kit available. I think the only way to really tell what you need is to tear into it.
Good luck, thats about the extent of my knowledge!
53moneypit (Dave) worked on hoist equipment for years and Im surprised he hasnt piped up yet.
Jeff
