Inspect and replace U-Joints and input shaft seal

On my Thomas Protough 1700 the input shaft is leaking on the hydrostatic motor. The manual is light of specifics as to how to replace the seal. I've read that the U-joints could be the problem.

How do I insect them?
Is this a common style of U-joint for replacement parts?
With this style can I get it apart in place or do I need to remove the pump or engine?

The pump is probably Eaton, but does not have any ID. How do I figure out what model I have?

Thanks,
Steve

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Inspect and replace U-Joints and input shaft seal