Abstract: Mechanism to generate the end load for a toroidal race rolling friction transmission. A chamber connected to a source of high-pressure fluid is formed by two parts, one of which is connected to the input disc of the transmission and the other to the contra-rotating output disc. The gap between the two parts is sealed by a member, for instance a sleeve or ring, fixed to some part of the transmission or associated structure that is stationary or that rotates only slowly, so that the speed of rotation of the sealing member is intermediate to those of the two discs.