This hydraulic oil tank stores and supplies fluid to the header drive system of the parent combine. It is mounted on the header assembly and acts as the reservoir for the hydraulic circuit that powers the reel, auger, and cutterbar functions. The tank includes the necessary porting for the supply and return lines that connect to the pump and actuators. A cracked or leaking tank causes a loss of system pressure, leading to sluggish or non-functional header movements. The original component matches the mounting bracket geometry and port locations of the housing it replaces, so no adapter fittings are needed. On installation, ensure the sealing surfaces are clean and the mounting bolts are torqued to specification.