This hydraulic pump supplies pressurized oil to the hydraulic system of a self-propelled forage harvester. It is mounted on the engine or gearbox drive and provides flow for functions such as steering, header lift, and spout control. A worn pump causes slow implement response and reduced system pressure. The manufacturer machines this component to match the original housing bore and drive coupling tolerances, so no shimming or adapter plates are required during replacement. On installation, ensure the drive shaft rotation direction matches the pump's internal rotation, and replace the inlet seal.