Abstract: Apparatus for pushing or pulling a cylindrical object includes a frame, a carriage slidably mounted on the frame, and a hydraulic actuator. An intermediately-pivoted lever is mounted on the carriage. The lower end of this lever is connected to the actuator. A roller member is mounted on the upper end of the lever for movement toward and away from a jaw member on the carriage. A stop member may be selectively located on the carriage to limit angular movement of the lever, thereby to allow relative movement between the jaw and the object in one direction but not in the other.