Abstract: A belt assembly for a pipe lining machine used to make concrete lined pipes. A pipe to be rotated is supported on the exterior surface of a belt loop wound around several pulleys, including a drive pulley and a displaceable pulley which moves laterally in response to slack and tension in the belt loop. A damping assembly is connected to the displaceable pulley to damp vibrations in the displaceable pulley. Preferably, the damping assembly includes a pneumatic suspension member, e.g., air bellows, and a hydraulic damping member, e.g., a hydraulic shock-absorbing cylinder, connected in series to the displaceable pulley.