Plug for National Crane 900

The 204474 plug serves as a sealing component within the hydraulic and lubrication systems of heavy machinery. Its primary function is to close threaded openings in valve blocks, reservoirs, housings, or pipelines. By providing a secure closure, the plug prevents the leakage of hydraulic oil, lubricants, or coolants while simultaneously blocking external contaminants such as dust, dirt, and moisture from entering the internal circuits. This ensures the cleanliness and integrity of the fluid systems during operation.

This part is compatible with the National Crane 900 truck-mounted crane. It is installed at strategic access points within the machine's fluid systems where a reliable seal is required to maintain system pressure and prevent fluid loss. The design facilitates a precise fit into the designated threaded ports, allowing for installation and removal during routine maintenance or system inspections.

In heavy machinery, plugs are used throughout various assemblies to seal off unused ports or provide access for maintenance. They are engineered to withstand the internal pressures and environmental conditions typical of crane operation. Maintaining these seals is necessary to prevent pressure drops and fluid contamination, which are critical for the continued performance of the hydraulic and lubrication systems.