Closing plug for Demag AC80-1

The closing plug, identified by part number 255 679 40, is a component used in the Demag AC80-1 all-terrain crane. Its function is to seal openings in housings, reservoirs, hydraulic blocks, or piping systems. By securing these access points, the plug prevents the leakage of internal fluids such as oil, coolant, or fuel, while simultaneously blocking the entry of external contaminants like dust and moisture into the machine systems.

This component is compatible with the Demag AC80-1 crane. It is installed in various locations throughout the hydraulic, lubrication, and transmission systems to maintain the integrity of the fluid circuits. Proper installation ensures that the internal environment of these systems remains controlled and free from debris.

Closing plugs of this type are used across heavy machinery to seal unused ports or service access points. They provide a static seal that maintains system pressure and prevents the loss of operating fluids, which is necessary for the consistent operation of hydraulic and mechanical assemblies. Regular inspection of these plugs is a standard part of maintenance to ensure no fluid loss occurs at the connection points.