The present invention proposes an HST mission of a tractor that transmits power to a PTO shaft without power loss. The transmission of the present invention includes: an HST (10) having an HST input shaft to which power is transmitted; A PTO shaft 4 directly connected to the HST input shaft, having a PTO clutch in the middle, and having a PTO counter shaft 4C coaxially connected thereto; An auxiliary transmission (20) capable of shifting the power transmitted from the HST output shaft provided in the HST to multiple stages; A differential device (30) for distributing the output from the auxiliary transmission device to both rear wheels as needed; And a rear PTO 40 and a mid PTO 50 capable of selectively receiving power from the PTO counter shaft 4C. The mid PTO 50 includes a mid PTO casing 58, a mid PTO gear 54 supported by a mid PTO counter shaft 54A in the mid PTO casing 58, And a mid PTO output shaft 52 having an engaged gear portion. And the mid PTO casing 58 is detachably mounted on the transmission casing, so that the mid PTO casing 58 can be selectively mounted on the tractor.
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