I have a "56 445 backhoe too, that works, BUT, I have a Big Mo 500 forklift that the hydraulics just up and quit on me, just like yours. I pulled the pump off the back and figured out the little coupling between the pump and the shaft had worked itself off one of the shafts. I used some washers to shim it up so the coupling stayed on both shafts. Easy to fix but it took 2 weeks of spare time to figure it out. That coupling has a snap ring in the center to keep the coupling centered on the 2 shafts but it is an inch too short. They have splines like a PTO shaft. I hope this helps.
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