Dynamic test. The fifth wheel coupling shall be subjected to alternating stress on a test rig (asynchronous dynamic test) with horizontal alternating and vertical pulsating forces acting simultaneously. 3.7.3.1. In the case of fifth wheel couplings not intended for the positive steering of semitrailers, the following forces shall be used: Horizontal: Fhw = ±0.6 × D Vertical: FsO = g × 1.2 U FsU = g × 0.4 U These two forces shall be applied in the longitudinal median plane of the vehicle with the lines of action of both forces FsO and FsU passing through the centre of the joint of the coupling. The vertical force Fs alternates between the limits +g × 1.2 U and +g × 0.4 U and the horizontal force between ±0.6 D. 3.7.3.2. In the case of fifth wheel couplings intended for the positive steering of semitrailers the following forces shall be used: Horizontal: Fhw = ±0.675 D 1. The lines of action of the forces are as given in paragraph 3.7.3.1. 3.7.3.3. For the dynamic test of fifth wheel couplings, a suitable lubricating material shall be placed between the coupling plate and the trailer plate so that the maximum coefficient of friction, µ ≤ 0.15.
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Sources: Agreement Concerning the Adoption of Uniform Technical Prescriptions for Wheeled Vehicles, Agreement Concerning the Adoption of Uniform Technical Prescriptions for Wheeled Vehicles