This part of ISO 11001 specifies the essential dimensions for the attachment of three-point hitch implements to the rear of agricultural wheeled tractors equipped with a three-point free link hitch according to ISO 730-1 and a bar coupler. NOTE 1 In general, the dimensions associated with the tractor and the implement for use with hitch couplers are the same as for the three-point linkage specified in ISO 730-1. Due to the special construction and function of the bar coupler it infringes on the clearance zone specified in ISO 2332. The three-point hitch coupler systems constitute a special way of implement mounting. The hitch couplers are an additional component located between the three-point linkage and the implement making it possible to hitch and unhitch from the operator's seat. This part of ISO 11001 applies to categories 2 and 3 of agricultural wheeled tractors as defined in ISO 730-1.