本文件规定了狭窄拖拉机前部安装的防滚翻保护结构（ROPS）的静态和动态强度试验程序。它定义了刚性或可倾斜、前部、两个立柱ROPS（包括任何相关的后部固定装置）的间隙区域和验收条件，适用于具有以下特征的拖拉机: -？前轴和后轴壳体最低点下方的离地间隙不超过600毫米（不考虑轴差速器上的较低点）； -？两轴之一的固定或可调最小轮距小于1？150？mm； 注:可以理解的是，装有较宽轮胎的车轴的轮距设置不超过1？150？mm。轮胎轮距可调，以便较窄轮胎的外缘不会超出另一轴轮胎的外缘。如果两轴装有相同尺寸的轮辋和轮胎，两轴的固定或可调轮距小于1？150？mm。 -？质量大于400？kg但小于3500？kg，无配重，包括ROPS和制造商建议的最大尺寸轮胎； -？配备了双离合器的防滚翻保护结构- 立柱式仅安装在座椅分度点（SIP）前面，其特点是拖拉机外形的间隙区域减小。 本文件还规定了座椅固定点和用于折叠的前置ROPS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) front-mounted on narrow tractors. It defines the clearance zone and acceptance conditions for rigid or tiltable, front, two-post ROPS, including any associated rear fixtures, 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; NOTE It is understood that the axle mounted with the wider tyres is set at a track width of not more than 1？150？mm. Tyre track width is adjustable so that the outer edges of the narrower tyres do not extend beyond the outer edges of the tyres of the other axle. Where the two axles are fitted with rims and tyres of the same size, the fixed or adjustable track width of the two axles is less than 1？150？mm. —？a mass greater than 400？kg but less than 3？500？kg, unballasted, including the ROPS and tyres of the largest size recommended by the manufacturer; —？fitted with roll-over protective structures of the dual-pillar type mounted only in front of the seat index point (SIP) and characterised by a reduced clearance zone attributable to the tractor silhouette. This document also specifies optional testing procedures for both seat anchorage points and folding efforts of front-mounted ROPS designed to fold.