Yours appears to have the little added hydraulic pump behind the main hydraulic pump drive with the tach cable connected to it that is not "factory" and exists only to provide oil to the wet disc traction disconnect clutch that's located inside, replacing the coupling the others are telling you to inspect. (The added pump is the "silver-looking" part in this photo.)
The steel line crossing over the top of the transmission to the LH side is another "giveaway" that your machine is equipped with this rather rare accessory.
The hydraulically-operated traction disconnect clutch makes for a sort of "live PTO" by disconnecting power to the differential drive pinion, stopping the motion of the tractor while allowing the PTO to continue to operate.
Obviously, something is wrong with yours, and the hydraulically-operated clutch operates on occasionally!
Factory coupler between transmission and differential drive pinion is shown in the top photo, accessory wet clutch and shorter pinion drive coupling are shown in lower photo.
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