This standard specifies the characteristics and mounting and clearance measurements common to hydraulic cylinders and towed implements related to agricultural work. The specifications indicated allow: a) the interchangeability of the hydraulic drive between tractors equipped with a cylinder and the towed implements intended for this application, the tractor having sufficient power on the hitch bar to operate the implement. b) the transfer of the hydraulic cylinder from one implement to another. It applies to the following three categories of agricultural tractors: