Opposite end sections (20, 26) of a piston/cylinder drive unit (14) are clamped to longitudinally spaced apart transverse mounting beams (10, 12), by a fixed clamp parts connected to the mounting beams (10, 12) and removable clamp parts that are connected by bolts to the fixed clamp parts. The piston rod end sections (20, 26) include longitudinal passageways having outer end openings that project outwardly from the clamps. Manifolds are secured to the mounting beams (10, 12) outwardly of the end openings in the piston rod end sections (20, 26). A detachable coupling connects ports in the manifold with the end openings in the piston rod end sections (20, 26). The piston cylinder drive unit (14) can be detached from the frame by first detaching the fluid couplings and then detaching the clamps which clamp the piston rod end sections (20, 26) to the mounting beams (10, 12).