IS0 730的本部分规定了将机具或设备连接到农业轮式拖拉机后部的三点悬挂机构的尺寸和要求。如表1所示，它规定了在不同系列的农业拖拉机上使用的四种类型。根据动力输出（PTO）的位置，类别4分为两部分，4L和4H。4L和4H类尺寸分别适用于后轴中心线下方和上方配备PTO的拖拉机。IS0 8759-2中给出了将机具或设备连接到农业拖拉机前部的三点悬挂机构的尺寸和要求。

This part of IS0 730 specifies the dimensions and requirements of the three-point linkage for the attachment of implements or equipment to the rear of agricultural wheeled tractors.It specifies four categories to be used on different ranges of agricultural tractors as shown in table 1.Category 4 has been divided into two parts, 4L and 4H, depending on the location of the power take-off (PTO). Category 4L and 4H dimensions apply to tractors with the PTO, respectively, below and above the rear axle centreline. Dimensions and requirements for the three-point linkage for the attachment of implements or equipment to the front of agricultural tractors are given in IS0 8759-2.