For truck-mounted hydraulic systems, the most common 
design in use is the equipment pump. This design is usually characterized as having fewer shifting parts, being simple to support, more tolerant of contamination than various other designs and relatively inexpensive. Gear pumps are set displacement, also called positive displacement, pumps. This implies the same volume of flow is produced with each rotation of the pump’s shaft. Gear pumps are rated in terms of the pump’s maximum pressure rating, cubic ” displacement and maximum input speed Gear Pump china limitation.
Generally, gear pumps are found in open center hydraulic systems. Gear pumps trap essential oil in the areas between your teeth of the pump’s two gears and the body of the pump, transport it around the circumference of the apparatus cavity and then drive it through the wall plug port as the gears mesh. Behind the brass alloy thrust plates, or wear plates, a little amount of pressurized essential oil pushes the plates tightly against the gear ends to boost pump efficiency.