Abstract: A mechanical cycle counter incorporates a cast aluminum, thermal isolating upwardly open connector coupled to a steam powered cyclic actuator depending stainless steel cylinder closed off at opposite ends by stainless steel end caps. A disk-like piston slides interiorly of the cylinder and is extended by a piston rod upwardly through the cylinder and through a hole within the bottom of the connector. A mechanical counter oscillation arm rotates approximately sixty degrees and is mounted to a shaft bearing a plurality of rotary wheels. A horizontal portion of the oscillation arm is in the path of the projecting end of the piston rod. A chamber beneath the piston and above the lower end cap receives steam. A stainless steel coil spring concentrically surrounds the piston rod and has one end abutting the piston and the opposite end abutting the upper end cap.