Yamaha - Gear Pump Assembly Hydraulic System Pump 6CJ-43830-00-00. Overview. On Yamaha setups that rely on hydraulic systems, the gear pump is what keeps everything responsive and working the way it should. When it starts to wear out, you'll feel it in delayed response or weak performance. I've replaced pumps on units that felt sluggish, and the difference was immediate-everything tightened up and ran smoother. It's one of those parts that keeps the system consistent every time you're out on the water.. Key Features. • Steady Hydraulic Flow Output - Maintains consistent pressure for smooth system operation.• Precision Gear Pump Design - Moves fluid efficiently to support reliable performance under load.• Durable Internal Build - Designed to withstand continuous use and resist internal wear.• Consistent System Response - Helps ensure predictable operation of hydraulic-driven components.• Factory-Spec Fitment - Engineered to match Yamaha system requirements for proper installation.. Engi