Hydraulic tank cap for Demag AC 615

The hydraulic tank cap is a component designed to seal the hydraulic oil reservoir on heavy machinery. It protects the hydraulic fluid from external contaminants such as dust, debris, and moisture. Additionally, the cap facilitates controlled ventilation to balance internal tank pressure with atmospheric pressure, which is necessary as fluid levels fluctuate during operation. By maintaining a clean environment within the reservoir, the cap helps protect downstream hydraulic components like pumps, valves, and cylinders from damage caused by impurities.

This component, part number 27018340, is compatible with the Demag AC 615 all-terrain crane. It is engineered to meet the specific requirements of the hydraulic system on this machine. The cap often incorporates a breather filter to allow air exchange while filtering out airborne particles.

Hydraulic tank caps function by providing a secure, airtight seal that prevents leaks and the ingress of water. The integrated breather mechanism allows the system to breathe as the oil level changes due to thermal expansion and operational demand. Ensuring the cap is in good condition is a standard part of routine maintenance for hydraulic systems, as a damaged seal or clogged breather can lead to system contamination and potential operational issues.