does any one know witch lines are feed and what lines are return ? I am told their are 2 feeds and 2 returns not sure what is what
A little more info might help. As general information most of those old Prentices had a two section gear pump, one section ran the left valve, the other the right. Lines coming from the pump are feeds and if you're lucky the valves will be marked for in and out. Outlet lines are return direct to tank or through return filters one would hope. If the valves are not clearly marked, try to post up some good pictures, somebody may know or be able to suss out which is which.