Tractor with p.t.o. shaft drive

The tractor has a motor (4), a power take-off (PTO) gear (6) and pulleys (24,25). The motor is connected with PTO gear by shaft (5). A main shaft portion (26) has a sleeve (16) which is radially and immovably engaged in a socket (32) of transmission side shaft portion (11), in locking position of shaft. An end portion (27) of main shaft portion is axially moved to pass through a lateral opening of socket of transmission side shaft portion, in unlocking position.