This standard specifies the basic dimensions of three-point hitch implements and agricultural wheeled tractors with three-point hitch and A-frame coupler in accordance with GB1593.1 or GB10916. Note: In general, when the coupler is used, the relevant dimensions of the tractor and implements are the same as those of the three-point hitch specified in GB1593.1 or GB10916, and the clearance range is the same as that specified in JB/T6684. The three-point hitch coupler system is a special method of securing implements. A hitch coupler is an add-on between the three-point hitch and the implement that allows hitching and unhitching from the driver's seat. Due to the special structure and function of the suspension coupler, it should be specified in the relevant standards that the length of the tie rod is variable. This standard applies to Type 2 agricultural wheeled tractors specified in GB1593.1.