The hydraulic cylinder (4 in Figures 2 and 5) houses the piston and is the area where the hydraulic oil does its work. The directional control valves control the flow of oil into and out of each side of the hydraulic cylinder.

At each end of the hydraulic cylinder is an end plate that is used to connect the hydraulic cylinder to the high pressure cylinder. The two end plates for the hydraulic cylinder are connected and pulled tightly in place with 4 tie rods and bolts.