Mid-center testing evaluates a hydraulic cylinder with its piston parked at or near the middle of the stroke, where seals and bore surfaces see the most wear. The core methods are a pressure-hold (drift) test, an internal leakage (bypass) flow test, a breakaway and friction pressure check, a load-holding test, and a visual inspection of the rod and external seals. Used together, they reveal worn piston seals, scored barrels, and leaking valves before they cause unplanned downtime. Hydraulic cylinders rarely fail all at once. They fade: a slow drift under load, a slightly slower cycle, and a film of oil on the rod. Because most cylinders spend their working life in the middle of their stroke, that is where damage accumulates first and where testing gives the most useful picture. This guide explains what mid-center testing means, how each method works, and how to interpret what you find.
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