Session 3 is all about hydraulic pumps—the heart of the system and occasionally the reason your day gets complicated. BJ walks through pump types, how they actually move fluid, and why some are overachievers while others are just along for the ride. We also cover cavitation and aeration (aka the “your pump sounds terrible” phase), take a look inside gear, vane, and piston pumps, and talk about efficiency, pressure limits, and how not to accidentally shorten your pump’s lifespan. It’s part theory, part real-world reality—because in hydraulics, things always sound fine… until they don’t 😄