 Castrol Molub-Alloy 880 LF Heavy Walking Cam Lubricant was developed specifically for use on Monighan Walking Cam mechanisms of large surface mining equipment. Unlike the conventional asphaltic base lubricants,
Molub-Alloy 880 LF Heavy exhibits exceptional plasticity and adherence to bearing surfaces over a wide temperature range because of its unique combination of oils and adhesive and tackiness agents.
During a relocation (walk), the Monighan cam bearing surfaces are in combined sliding and rolling motion in line contact only. The pressure actually exceeds the yield strength of the metal at contacting asperities (microscopic high spots) creating the potential for high temperature and metal welding. A high content of a proprietary blend of Molub-Alloy solid lubricants not only serves to strengthen the film structure, but also helps to reduce contact temperatures and metal welding.
The combined action of the film-forming anti-weld components of Molub-Alloy 880 LF Heavy help to eliminate chatter and vibration during walks as well as reducing friction, wear, and the resultant high costs of repairs and downtime.
Molub-Alloy 880 LF Heavy is part of Castrol Performance Lubricants? Eco-Solutions? product offering. Formulated to address environmental concerns, it is free of lead, chlorinated solvents, and barium.
Molub-Alloy 880 LF Heavy is manufactured from a select, high viscosity petroleum oil together with other, nonasphaltic, petroleum constituents; these are further fortified with adhesive and tackiness agents plus an inorganic thickener chosen for its flow and film-forming characteristics.
Metallic lubricating solids of specific grade and size distribution are treated to increase their natural positive affinity to metal surfaces and are completely dispersed to assure their effectiveness.
The unique formulation of Molub-Alloy 880 LF Heavy accounts for the building, under extreme sliding-rolling pressures, which resists melting or squeezing out as well as wiping or washing off through a broad range of ambient temperatures and climatic conditions. |
Applications:
The primary application for which Molub-Alloy 880 LF Heavy was intended is to lubricate the Monighan Walking Cam mechanism. It does, however, serve to lubricate other bearing surfaces in slow relative motion where pressures are sufficiently high to cause metal deformation at asperities with possible seizure and galling. Typical examples would be heavy sliding mechanisms or large open gears possibly exposed to shock load and high ambient temperatures.
Heavy duty pressure dispensing equipment may be used if the temperature of the system can be maintained at 90 to 95°F (32 to 28°C, see Notes). The product requires no heating to be applied manually with relative ease.
For simplified and safe hand application to the Monighan cam during a walk, Molub-Alloy 880 LF Heavy is available in polyethylene bags. A gas is dropped into the mechanism just prior to the meshing of the two bearing surfaces; under the tremendous and instantaneous temperature rise, the package disintegrates to become an effective part of the lubricating
film. |
