ISO 789-2:2018 specifies test procedures for determining the lifting capacity of rear-mounted three-point linkage systems:
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.
NOTE 1 A static test provides an adequate comparison between tractors. The test results are used only as a means of comparing tractors and not as a way of recommending the size of an implement which can be carried by the tractor.
NOTE 2 This test procedure can be used to determine the lifting capacity of front-mounted three-point hitch systems.