An installation for filling receptacles by weight, the installation comprising a platform having secured thereto at least one filler spout and a weighing device which is vertically below the filler spout and which comprises a receptacle support member associated with a weighing member. The installation is distinguished in that the weighing device includes a link member between the support member and the weighing member, the link member enabling the support member to be moved relative to the weighing member between a high position in which the filler spout is engaged in the receptacle, and a low position in which the filler spout is disengaged from the receptacle, and in that the weighing device includes a locking member for locking the link member with the support member in its high position.