ISO 12003-2:2021 Tractors for agriculture and forestry — Roll-over protective structures on narrow tractors — Part 2: Rear-mounted ROPS

ISO 12003-2:2021 Tractors for agriculture and forestry — Roll-over protective structures on narrow tractors — Part 2: Rear-mounted ROPS. 7.4.1.6 The pendulum block shall he released so that it strikes the rear-mounted ROPS. 7.4.2 Front impact test procedure 7.4.2.1 The tractor shall he positioned in relation to the pendulum block such that the block will strike the rear-mounted ROPS when the impact face of the block and the supporting chains or wire ropes are at an angle with the vertical plane, a, equal to mdlOO with a 200 maximum, unless, during deflection, the rear-mounted ROPS at the point of contact forms a greater angle to the vertical. In that case, the impact face of the block shall be adjusted by means of an additional support such that it is parallel to the rear- mounted ROPS at the point of impact at the moment of maximum deflection, with the supporting chains or wire ropes remaining at the angle defined above. The suspended height of the pendulum block shall he adjusted and any necessary steps taken to prevent the block from turning about the point of impact. The point of impact is that part of the rear-mounted ROPS likely to hit the ground first if the tractor overturned sideways while travelling forward, normally the upper edge. The position of the centre of gravity of the block shall be one-sixth the width of the top of the rear-mounted ROPS, inwards from a vertical plane parallel to the median plane of the tractor touching the outside extremity of the top of the rear-mounted ROPS. If the rear-mounted ROPS is curved or protruding at this point, wedges enabling the impact to be applied thereon shall be added without thereby reinforcing the rear-mounted ROPS. 7.4.2.2 The tractor shall be lashed to the ground as prescribed in 523 to 524 as shown in Figure 6. The spacing between the front and rear lashing points shall be such that the wire ropes make an angle of less than 30° with the ground. The rear lashings shall, in addition, be so arranged that the point of convergence of the two wire ropes is located in the vertical plane in which the centre of gravity of the pendulum block travels. The wire ropes shall be tensioned so that the tyres undergo the deflection given in 522. With the wire ropes tensioned, the wheel beam shall be placed in front of...