Telescopic cylinders drift or lose pressure mainly because oil is escaping or being displaced somewhere it shouldn't be. The most common culprits are worn piston and stage seals that allow internal bypass, leaking control or load-holding valves, external leaks at glands and fittings, trapped air, and thermal contraction of the oil. Because a telescopic cylinder has several nested stages, each with its own seals and bearings, there are more places for leakage to start than in a single-stage cylinder. If you have ever watched a dump truck bed creep downward or a lift slowly settle under load, you have seen cylinder drift. It is more than an annoyance. Drift wastes energy, damages components, and can become a safety hazard. This guide explains how telescopic cylinders work, why they drift or lose pressure, and how to find and fix the cause.
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