This external control button is a momentary-contact switch mounted on the rear fender of the host tractor. It provides a remote electrical signal to the hydraulic system, allowing the operator to actuate a function such as raising or lowering an implement without leaving the cab. The button sits in the circuit between the operator control and the solenoid valve that directs hydraulic flow. A failed switch will cause intermittent or no response from the controlled hydraulic function. This component is manufactured by AGCO to match the original switch's electrical rating and mounting geometry, ensuring correct contact pressure and sealing against moisture ingress in the fender location.