Abstract: A concrete pipe manufacturing machine movable in a mold for receiving a concrete mixture to form a tubular concrete wall includes a troweling cylinder assembly having a head plate. A vertically movable and rotatable drive shaft is fixed to the head plate for moving the troweling cylinder assembly in a vertical direction and in one rotational direction. A series of roller assemblies are rotatably mounted on the head plate and are adapted to be rotated by frictional contact with the concrete mixture in a direction counter to the one rotational direction of the drive shaft. A drive arrangement interconnects and collectively drives the roller assemblies together for preventing jamming of the roller assemblies due to material in the concrete mixture.