Hydraulic System (General Information)

IMPORTANT: The components in this system are built to very close tolerances and have been adjusted at the factory. Do not attempt to service or adjust these components, except to maintain correct oil level and to change oil and filter. See your John Deere dealer for all other service.

The windrower hydraulic system is an open-center system. In an open-center system the pump runs continuously, even when system components are not activated (system is in neutral).

When the system is in neutral, oil flows through the system, through the cooler, and back to the reservoir - the "open-center" feature.

One oil pump supplies oil for the charge and auxiliary systems. A priority valve supplies all the flow required for the charge system. The excess flow is available for the auxiliary systems.

There are two oil filters providing filtration for the charge and return oil systems.

A-Return Filter
B-Charge Filter
C-Reservoir Sight Glass
D-Charge Valve
E-Priority Valve
F-High-Pressure Valve

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