Coupling apparatus for coupling a mower to a front three-point linkage of a tractor includes a mounting element for coupling to the three-point linkage and a carrier element to which the mower is coupled. A linkage mechanism including upper link members and a lower link member couples the carrier element to the mounting element. The lower link member is pivotally coupled to the mounting element about a first lower pivot axis. A pair of take-up springs act between the lower link member and the mounting element to take up a portion of the weight of the mower. The take-up springs are coupled between corresponding anchor elements and corresponding anchor brackets on the lower link member. The anchor elements are carried on respective compensating arms, which in turn are pivotal on pivot shafts carried on the mounting element. Actuator arms acting between the lower link member and the compensating arms urge the anchor element upwardly and downwardly as the carrier element moves upwardly and downwardly for controlling the turning moment induced by the take-up springs in the linkage mechanism, in order to maintain the effective weight of the mower bearing on the ground substantially constant.