For truck-mounted hydraulic systems, the most typical design in use may be the equipment pump. This design is usually characterized as having fewer shifting parts, being easy to service, more tolerant of contamination than other designs and relatively inexpensive. Gear pumps are set displacement, also known as positive displacement, pumps. This means the same volume of flow is created with each rotation of the pump’s shaft. Gear pumps are rated with 
regards to the pump’s Gear Pump china maximum pressure rating, cubic inch displacement and maximum insight speed limitation.
Generally, gear pumps are used in open center hydraulic systems. Gear pumps trap oil in the areas between the teeth of the pump’s two gears and your body of the pump, transport it around the circumference of the gear cavity and then force it through the outlet slot as the gears mesh. Behind the brass alloy thrust plates, or use plates, a little amount of pressurized oil pushes the plates tightly against the apparatus ends to boost pump efficiency.