Sounds like the spirol pin that connects the coupler to the pump shaft broke since the shaft is not turning on the back side of the pump. Take a good look at the coupler and see if it's spinning on the shaft going into the pump.
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2264 with 54 GT deck
1641 AKA Black Jack with a 402-E Haban Sickle bar mower
JD317 dump truck
BX2670 with FEL
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