For truck-mounted hydraulic systems, the most common design in use is the gear pump. This design is definitely characterized as having fewer moving parts, being easy to provider, more tolerant of contamination than additional designs and relatively inexpensive. Gear pumps are set displacement, also known as positive displacement, pumps. This means the same level of flow is created with each rotation of the pump’s shaft. Gear pumps are rated with regards to the pump’s maximum pressure rating, cubic inch displacement and maximum input speed limitation.

Generally, gear pumps are found in open center hydraulic systems. Gear pumps trap oil in the areas between the the teeth of the pump’s two gears and the body of the pump, transportation it around the circumference of the apparatus cavity and then power it through the wall plug interface as the gears mesh. Behind the brass alloy thrust plates, or wear plates, a little amount of pressurized essential oil pushes the Gear Pump china plates tightly against the apparatus ends to improve pump efficiency.