ISO 6489-3:2021 pdf download – Agricultural vehicles — Mechanical connections between towed and towing vehicles — Tractor drawbar. 1 Scope This document specifies the dimensional requirements and location for category 0, 1, 2, 3, 4 and 5 drawbars mounted on the rear of agricultural tractors. 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 789-1, Agricultural tractors —...