For truck-mounted hydraulic systems, the most common design in use may be the gear pump. This design is usually characterized 
as having fewer shifting parts, being simple to service, more tolerant of contamination than various other designs and fairly inexpensive. Gear pumps are fixed displacement, also called positive displacement, pumps. This implies the same level of movement is created with each rotation of the pump’s shaft. Gear pumps are rated when it comes to the pump’s maximum pressure rating, cubic in . displacement and maximum input speed limitation.
Generally, gear pumps are found in open center hydraulic systems. Gear pumps trap oil in the areas between your 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 outlet port as the gears mesh. Behind the brass alloy thrust plates, or put on plates, a small amount of pressurized oil pushes the Gear Pump china plates tightly against the apparatus ends to improve pump efficiency.