Hydraulic woes

I have a 1967 830ck with a 70 loader, I am using the tractor's hydraulic outlets to operate the loader.
Last winter I went to use it to plow the driveway, when I pulled the lever to lift the bucket the engine bogged down for just a moment and the loader would not lift. Yes, there is water in the fluid. After the weather warmed enough for the ice to melt I attempted to use the tractor again and discovered that the loader has no power. it will raise and tilt but has no power. I figured that the pressure relief valve had stuck open. I cleaned & inspected it. I fired the tractor up and got the same result. While operating the valves from the back of the tractor I noticed that when putting a load on the hydraulics the PTO shaft would stop rotating. {I have been unable to adjust it to not spin when not engaged.} The only way I see for this to happen is for the pump drive shaft part number A32436 to be broken. Before diving further into this repair I thought I would seek the advice and wisdom of those who may have experienced this situation and might guide me to a different solution, as changing the pump drive shaft looks to be quite involved. {but not outside of my skill set}.
 
Oil in cylinders does not heat like the reservoir, ice remains so until heated by an outside source. Loosen the drain plug for your hyd oil reservoir and let it drip until oil appears. This drains water first. Allow tractor to sit at least overnight first so water settles to the bottom. Preferable to sit for a week undisturbed.
 
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