本文件规定了安装在狭窄拖拉机后部的翻车保护结构（ROP）的静态和动态强度测试程序。它定义了刚性或可倾斜、后部、双柱防滚架、车架和驾驶室防滚架的间隙区域和验收条件，并适用于具有以下特性的拖拉机: 前后桥壳最低点下方的离地间隙不大于600 mm（不考虑车桥差速器上的低点）； 两个车轴中的一个车轴的固定或可调节的最小轮距宽度小于1150 mm，并且另一个车轴的总宽度小于第一车轴的总宽度，包括两个车轴装配有相同尺寸的轮辋和轮胎的情况； 固定的驾驶位置和大于400千克的无压载质量，包括制造商推荐的最大尺寸的ROPS和轮胎；可逆驾驶位置（可逆座椅和方向盘），无压载质量大于400千克，包括制造商推荐的最大尺寸的ROPS和轮胎，最大无压载质量小于3500千克，最大允许质量小于5250千克； 小于1.75的质量比； 防滚架、车架或驾驶室类型的ROPS，部分或全部安装在座椅索引点后面，并具有上限为座椅索引点上方（810+av）mm的间隙区域，以便提供足够大的区域或无障碍空间来保护驾驶员。 本文件还规定了座椅固定点和设计用于折叠的后置ROPS的折叠力的可选测试程序。

This document specifies procedures for both the static and dynamic strength testing of roll-over protective structures (ROPS) rear-mounted on narrow tractors. It defines the clearance zone and acceptance conditions for rigid or tiltable, rear, two-post roll bar, frame and cab ROPS, and is applicable to tractors so equipped having the following characteristics:

• a ground clearance of not more than 600 mm beneath the lowest points of the front- and rear-axle housings (not considering lower points on the axle differential);
• a fixed or adjustable minimum track width of one of the two axles of less than 1 150 mm and with the overall width of the other axle being less than that of the first axle, including where the two axles are fitted with rims and tyres of the same size;
• a fixed driving position and a mass greater than 400 kg, unballasted, including the ROPS and tyres of the largest size recommended by the manufacturer;
• a reversible driving position (reversible seat and steering wheel), with a mass greater than 400 kg, unballasted, including the ROPS and tyres of the largest size recommended by the manufacturer and maximum unballasted mass less than 3 500 kg and maximum permissible mass less than 5 250 kg;
• a mass ratio less than 1,75;
• a ROPS of the rollbar, frame or cab type, mounted partly or entirely behind the seat index point and having a zone of clearance whose upper limit is (810 + a_v) mm above the seat index point in order to provide a sufficiently large area or unobstructed space for the protection of the driver.

This document also specifies optional testing procedures for both seat anchorage points and folding efforts of rear-mounted ROPS designed to fold.