I agree with the other posters that there is probably a broken piece or two when it comes to the lever. Broken roll pins are common, and that charge pump valve release lever isn't one of IH's best engineering ideas.
I also agree, that with the transaxle low a gallon of HyTran, you could have some worn and/or sticky relief valves. If you don't find any broken roll pins, and you are unable to get the valve plungers to come up, you may need to replace or rebuild your valves. I would recommend against used valves. There is no reason to replace 35 plus year old valves with 35 plus year old valves, unless they have been rebuilt.
If you were to look on eBay under Cub Cadet, you will find a gentleman who rebuilds those Sunstrand pump valves. I haven't used the service, but I understand that he does pretty good work. New valves are available, but are very expensive. Were this me, I would give the rebuilt option a try.
Good luck with your project.
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