Open Center Hydraulic System

IMPORTANT: The hydraulic system design used on this tractor is known as an open center system. In general, it is not recommended to use continuous flow hydraulic motors with this type of system. Some hydraulic motors designed for open centered systems (high flow at low pressure) can be used, where a pressure compensated flow control valve is used to control speed. If the tractor is equipped with a dual function SCV, it must control motor speed with an independent pressure compensated flow control valve. Using a non-compensated flow control valve such as a needle valve can cause overheating of the hydraulic system. Consult your nearest John Deere dealer or service facility for more information regarding this type of application.

If the hydraulic motors are not correctly sized for an open center system, then hydraulic motor applications such as those used in the vacuum blower motors, centrifugal sprayer pumps, hydraulically driven rakes, or other similar applications can cause overheating of the hydraulic system. In such cases, the use of a PTO-driven hydraulic pump is recommended.

Open center systems cannot be used for implements requiring “active” downforce such as no-till, folding, air disk, and no-till air drills as well as used to maintain optimum press wheel downforce on air hoe-drills.

Anytime one of mentioned applications is considered, consult nearest John Deere dealer or service facility for information on how to open center system in these applications.

Failure to observe this application information damages hydraulic system of tractor.