Lubrication reduces friction between moving parts. A spring return pneumatic actuator contains components like pistons, shafts, bearings, and linkage mechanisms that move against each other during operation.

Without proper lubrication, these parts rub directly against one another, generating excessive friction that can cause wear and tear on the surfaces of the components.

Regular lubrication creates a protective film between these moving parts, minimizing direct contact and friction, thus preserving the integrity of the components and ensuring smooth operation.

Lubrication helps prevent corrosion of internal metal components that are susceptible to corrosion when exposed to moisture or contaminants.

Lubricants act as a barrier, coating the metal surfaces and isolating them from moisture, dust, and other corrosive substances.

This prevents the formation of rust or oxidation, which could otherwise damage the components and impair the actuator's ability to function properly, especially its critical spring return mechanism.

The approach to lubrication requires attention to detail. The type of lubricant matters significantly—using the wrong lubricant can cause damage, like swelling or degradation of seals.

The frequency of lubrication depends on factors like the actuator's operating environment (high dust, humidity, or temperature) and the intensity of use (frequent cycling).

Even actuators with self-lubricating components often benefit from periodic checks to ensure the lubrication system remains effective.