The shaft 10213 is the original shaft that uses a half moon key, most likely it's been replaced with a shaft drilled for a roll pin instead. I have some of the original shafts still. First thing I'd do is press the old hydraulic head apart to find WHY it seized and broke the shaft. Replacing the pump and shaft without knowing WHY is risking breaking another pump and shaft. Just repaired a JD 4020 with a good used head and shaft from some core pumps on hand. Heads can seize by dirt, water, dropped line bolt washer, stuck injector, over-torqued delivery valve screw, timing gear failure, etc. With the old head pressed apart the seizure location will tell the cause, so it can be corrected BEFORE risking damage to the replacement pump.
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