F058423/ PG201567 are interchangeable replacement parts for the same axial piston variable displacement hydraulic pump, serving as the core power component specifically engineered by John Deere for the 810D light-to-medium-duty skidder. Serving as the âpower hubâ of the machine's hydraulic system, its core function is to deliver stable and precise high-pressure oil to four critical actuators: grapple operation, material conveyance, travel drive, and frame leveling. Its design deeply aligns with the 810D's operational demands in mountainous and hilly forest terrain â Resistant to vibrations on rough terrain, impervious to wood chip and dust ingress, and optimized for intermittent medium-load conditions, it is the factory-specified replacement part ensuring continuous operational efficiency and reliability.