CAN CSA M3463-09:2014 pdf download.Tractors for agriculture and forestry一Roll-over protective structures
5.2.2 Means to lash the tractor to the ground
The tractor shall be lashed, by means of steel wire ropes incorporating tensioning devices, to ground rails preferably spaced approximately 600 mm apart throughout the area immediately below the pivot points and extending for approximately 9 m along the pendulum block axis and approximately 1 800 mm to either side.The points of attachment of the lashings shall be approximately 2 000 mm behind the rear axle and 1 500 mm in front of the front axle. There shall be two lashings on each axle: one on each side of the median plane of the tractor. The lashings shall be steel cable of from 12,5 to 15 mm diameter, with tensile strength of from 1 100 MPa to 1 260 MPa. Details of the means are given in Figures 4, 5 and 6.
7.2.1 Positioning of tractor
For the impact tests to the rear and front, the tractor shall be positioned so that the supporting chains and the pendulum block face are at an angle of 20° to the vertical when striking the ROPS. If the angle of the roll-over protective structure member at the contact point at maximum deflection during impact is greater than 20° to the vertical, the block angle shall be further adjusted by any convenient means so that the striking face and the ROPS member are parallel at the impact point and maximum deflection, the supporting chains being at 20° to the vertical when the block strikes the roll-over protective structure.Where the angle is greater than 20°， the adjustment of the pendulum block striking face shall be based on estimated maximum deformation.
7.2.2 Rear impact
The rear impact is not required on tractors having 50 % or more of the tractor mass on the front wheels. The rear blow shall be struck in a vertical plane parallel to the longitudinal median plane on the corner opposite to that on which the side impact (see 7.3) is made and at two-thirds of the distance from the tractor median plane to the vertical plane touching the outside extremity of the roll-over protective structure top. However, if a curve in the back of the roll-over protective structure starts at less than two-thirds of the distance from the centre, the impact shall be at the beginning of that curve, i.e. at the point where this curve is tangential to a line at right angles to the tractor median plane.CAN CSA M3463-09 pdf download.