A guide to technical terms used in cylinder technical specifications

Dieseling Inside Hydraulic Cylinders

Dieseling inside hydraulic cylinders occurs when air is drawn past the rod seals and mixes with the hydraulic fluid.

When a mixture of air and oil is compressed in a cylinder it can explode, damaging the cylinder and burning its seals. Dieseling or a 'diesel effect' is a reference to the similarity of the end effect to the combustion process in a diesel engine.

This problem can occur for a number of reasons and it can quickly move from being a minor problem to a catastrophic failure of the unit.

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