This document specifies test procedures for determining the power available at the drawbar on agricultural tractors of the wheeled, track-laying or semi-track-laying type.nd edition 2018-02 Agricultural tractors — Test procedures — Part 9: Power tests for drawbar Tracteurs agricoles — Méthodes d'essai — Partie 9: Essais de puissance à la barre d'attelage Reference number ISO 789-9:2018(E) ？ ISO 2018 ISO 789-9:2018(E) COPYRIGHT PROTECTED DOCUMENT ？ ISO 2018 All rights reserved. Unless otherwise specified, or required in