CAN/BNQ 1811-310-M91

This National Standard of Canada is equivalent to International Standard ISO 789/2-1983. It specifies test procedures for determining the following hydraulic performance characteristics of agricultural tractors: a) the maximum vertical force which can be exerted by the hydraulic lift at the lower hitch points throughout their full range of movement; b) the maximum vertical force which can be exerted by the hydraulic lift, at a point 610 mm to the rear of the hitch points on a frame attached to the three-point linkage throughout its full range of movement; c) the maximum hydraulic power available at an external hydraulic tapping; d) optionally, the ability of the lifting system to maintain the load in the lifted position without hydraulic power. NOTE: To ensure that the lifting capacity and the hydraulic power are adequate for effective practical use and also to allow for variation in the performance of nominally identical tractors, the measured maximum performance is reported as that which would be obtained with the hydraulic fluid pressure maintained at 90 % of the pressure sustained by the relief valve (see 5.1.3.4).