03/01/16
670- 00017B
4
4.0 How it Works
Movotec
®
Crank Driven “Bolt-On” Lift Systems are comprised of three major component
subsystems; the crank, the pump and the lift cylinders. This section will explain how
each subsystem works together to make the lift system extend and retract.
Movotec
®
Crank Driven Schematic
4.1 Extension Cycle
The crank is mechanically coupled to the pump leadscrew shaft. When the crank is
rotated in a clockwise (CW) direction, the leadscrew shaft rotates in the same (CW)
direction. As the crank continues to rotate in a (CW) direction, the threaded pusherblock
moves up the leadscrew in the direction of arrow “A”. This action drives fluid from the
pressure elements, through the hydraulic tubing and into the lift cylinders causing them to
extend. As the cylinder load increases, the force required to rotate the crank increases.
Generally speaking, the crank force required to extend the system will always be greater
than the crank force required to retract the system. It is also important to note that when
