I have an old, and I do mean OLD, Allis Chalmers forklift.  It isn't fancy, but it does what I need, the price is right, and I like a challenge. The power part of the power steering has not worked since I bought it a year and a half ago. I finally got around to "t-ing" a pressure gauge in at the pump, and it appears I don't have any pump pressure. It is one of those early styles that piggy backs onto the generator. I realize that sometimes the spline coupler between it and the generator strip out, but I think in this situation the pump is just plain worn out.  Instead of rebuilding it or finding a replacement, I am considering connecting it to the regular hydraulic system on the forklift. Is the hydraulic fluid compatible with steering cylinders and valves, and is the pressure range acceptable? Does anyone have any reasons that this shouldn't be attempted? I might be in for a challenge adapting fittings and hoses, but I think it could be done.