56100-ZY9-023 Pump Assembly - Overview. The 56100-ZY9-023 Pump Assembly is a vital component in Honda marine engine systems, specifically designed for the power trim and tilt mechanism. This pump plays a crucial role in circulating hydraulic fluid that enables the trim and tilt functionality, helping maintain optimal boat handling and performance. Engineered to meet stringent factory specifications, it ensures seamless integration with existing parts, maintaining optimal performance and durabili