This webinar explored the importance of on-machine hydraulic testing and why evaluating systems under real operating conditions leads to more accurate troubleshooting and performance validation. Rowan LaHue discussed essential testing tools, measurement best practices, data acquisition systems, and systematic troubleshooting methods, including a real-world load-sensing hydraulic system case study. The session emphasized the value of accurate diagnostics, proper documentation, and understanding system-level interactions to improve reliability, safety, and maintenance outcomes.