This solenoid coil energizes the electro-hydraulic valve that controls fluid flow in the tractor's hydraulic system. It converts an electrical signal into a magnetic force that shifts the valve spool, directing oil to the selected actuator. A failed coil results in a non-responsive or stuck valve, causing intermittent or complete loss of hydraulic function. The coil is wound to match the original electrical resistance and pull characteristics, ensuring the valve opens and closes at the correct current threshold. When replacing, verify the connector and mounting orientation match the valve body to avoid pin damage.