5. HYDRAULIC SYSTEM 5. HYDRAULIC SYSTEM DESCRIPTION The Agrotron series is equipped with a Closed Centre (CC) hydraulic system, with one gear pump to supply the trans- mission circuit and a tandem gear pump to supply the steering circuit and services (auxiliary service control valves, trailer braking, etc.). The CC hydraulic system supplies oil to the loads at a rate of flow that is proportional to the engine speed. This means that when the engine is running at top speed and no hydraulic services are in operation (e.g.
during road use), the pump will continue to circulate oil in the hydraulic circuit at the rate of approximately 80 litres per minute (with a con- sequent increase in temperature and oil consumption) without any of this oil being used. 10-38