ISO 6489-5:2019 pdf free.Agricultural vehicles一Mechanical connections between towed and towing vehicles -Specifications for non-swivel clevis couplings.
1 Scope
This document specifies the requirements for non-swivel clevis couplings used for the attachment of agricultural trailers and implements equipped with a swivel hitch ring as specified in Iso 5692-3 to the rear of self-propelled agricultural vehicles.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 2 86-1, Iso system of limits and fits — Part 1: Bases of tolerances, deviations and fits
Iso 500-1, Agricultural tractors — Rear-mounted power take-off types 1,2,3 and4 — General specifications, safety requirements, dimensions for master shield and clearance zones
ISO 2768-1:1989, General tolerances — Part 1: Tolerances for linear and angular dimensions without individual tolerance indications
ISO 5692-3:2011, Agricultural vehicles — Mechanical connections on towed vehicles — Part 3: Swivel hitch rings
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at http:JJwww.electropediaorg/
3.1non-swivel clevis coupling
hitching device, not rotating around the horizontal longitudinal axis (roll), for the mechanical connection of trailers and implements
3.2 coupling reference centre
point along the pin centreline crossing the horizontal symmetry centreline of the drawbar housing
6 Design requirements
6.1 The coupling unit shape shall allow the swivel hitch ring the following minimum angles: +60° in the horizontal plane (yaw), +20° in the vertical plane (pitch), +20° around its longitudinal axis (roll).
6.2 Where a sub-frame is used between the agricultural tractor or towing vehicle and the coupling, this shall be tested with the appropriate coupling, according to the maximum coupling capacity.
6.3 The non-swivel clevis coupling unit shall be provided with a device to prevent unintentional
uncoupling. This device shall be
— easy to apply,
— retained on the hitch unit, and
— tested by the application of a static load of O,25D.
6.4 The clevis shall be designed for the D values specified in Table 1.
7 Location
The non-swivel clevis coupling shall be located as shown in Figure 2, mounted in the plane of the tractor’s or towing vehicle’s longitudinal axis. The centre of the non-swivel clevis coupling shall be located at the distance, t, rearwards from the end of the power take-off (PTO) shaft, in accordance with Table 2. The coupling shall be located as high as possible, without any part of the clevis/ring coupling or its construction (e.g. keeper) entering the clearance zone specified for the PTO in ISO 500-1.
9 Marking
The non-swivel clevis coupling shall have a permanent and visible coupling shape letter marking and ISO 6489-5 reference for the identification.ISO 6489-5 pdf download.