Tractor with p.t.o. shaft output

The tractor has a main motor and a power take-off gear unit (6) that is provided with a drive input portion and a power take-off output portion. The drive input portion is connected with the main motor by a dog clutch element (9) in releasable driving connection. The clutch element is provided with a displaceable sleeve portion (19) for resolving and closing drive connection at a shaft (5).