Cylinder Design Glossary

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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