For truck-mounted hydraulic systems, the most typical design in use is the equipment pump. This design is 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 circulation 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 Gear Pump china displacement and maximum insight speed limitation.
Generally, gear pumps are found 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, transportation it around the circumference of the apparatus cavity and then power it through the wall plug 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.