This repair kit contains the electromagnetic cores that actuate hydraulic control valves in the tractor’s hydraulic system. The cores convert an electrical signal from the tractor’s control unit into a mechanical movement that shifts the valve spool, directing oil flow to the connected implement or function. A failed core results in a non-responsive or erratic valve, causing the hydraulic function to either not engage or operate with delayed or incomplete movement. The kit includes the components needed to restore the original magnetic and mechanical characteristics of the valve assembly, matching the factory-set air gap and stroke so that the solenoid operates at its intended pull-in and hold current.