A paver having hitch arms adapted to be brought together to couple it to a towing vehicle, a gate raisable to open up discharge from the paver, and a lift actuatable to lift a screed in the paver from the ground. A hydraulic motor is provided for actuating each of the above under power. Manually operated pump mechanism drawing fluid from a reservoir is actuatable to supply fluid under pressure to each of said hydraulic motors. An electrically operated or driven pump having an intake connected to said reservoir and a system of selector valve and control valves provides for the supply of pressure fluid to each of such hydraulic motors by electrically energized means. Check valves associated with the manually operated pump mechanism, and check valves associated with the control valves supplied by the electrically driven pump permit the operation of either the manually operated pump mechanism or the electrically powered pump without interference of such operation by the pumping instrumentality which is inactive.
A material spreader for spreading large rock over a wet concrete or other surface utilizes a pair of hoppers which are driven back and forth on a bridge support spanning the surface. A gasoline engine mounts above the hoppers and furnishes power for a reversibly-controllable hydraulic hopper drive motor. The rock is dispensed by a rough-surfaced hydraulically motor driven cylinder with the discharge opening being controlled by a pair of spring-loaded gates which position themselves in response to the size rock being spread and the direction of travel of the spreader.
A material spreader for spreading a topping material over a wet concrete surface utilizes a pair of hoppers which are driven back and forth on a bridge support spanning the surface. A gasoline engine mounts above the hoppers and furnishes power for a reversibly controllable hydraulic hopper drive motor. The motor is part of a hydraulic system in which the hydraulic fluid is cooled by using both a hopper wall as well as the flowing material being spread as heat sinks.
