These are piston-type pumps that use hydraulic or pneumatic pressure to provide automated lubrication. It works in the same way as hand-operated piston pumps. The piston is actuated by hydraulic or pneumatic pressure in this system. In a hydraulic system, the recommended input pressure is 15-20 bar, whereas in a pneumatic system, it is 5-7 bar.
The hydraulic pump is a hydraulic system component that transfers mechanical energy into fluid energy in the form of oil flow. This mechanical energy is derived from the prime mover (a turning force), such as the power take-off or the truck engine directly. Each hydraulic pump will be either a single-rotational or a bi-rotational design. A uni-rotational pump, as the name implies, is designed to only rotate in one direction. A bi-rotational pump, on the other hand, can function in either direction.