本文件规定了安装在狭窄拖拉机后部的防滚翻保护结构（ROPS）的静态和动态强度测试程序。它定义了刚性或可倾斜、后、双柱防滚翻保护杆、机架和驾驶室防滚翻保护装置的间隙区和验收条件，适用于配备有以下特征的拖拉机:-前桥和后桥壳体最低点下方的离地间隙不超过600 mm（不考虑轴差速器上的较低点）； -两个轮轴之一的固定或可调整最小轮距小于1 150 mm，另一个轮轴的总宽度小于第一个轮轴的总宽度，包括两个轮轴安装相同尺寸的轮辋和轮胎的情况固定驾驶位置，质量大于400 kg，无配重，包括ROPS和制造商建议的最大尺寸轮胎可逆驾驶位置（可逆座椅和方向盘），质量大于400 kg，无配重，包括制造商建议的最大尺寸的ROPS和轮胎，最大无配重质量小于3500 kg，最大允许质量小于5250 kg； -质量比小于1.75；-防滚翻保护杆、框架或驾驶室类型的防滚翻保护装置，部分或全部安装在座椅索引点后面，其间隙区域的上限为座椅索引点上方（810+av）mm，以便为保护驾驶员提供足够大的区域或无障碍空间。本文件还规定了用于折叠的后置ROPS的座椅固定点和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 roll-bar, frame or cab type, mounted partly or entirely behind the seat index point and having a zone of clearance whose upper limit is (810 + av) 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.