Lubricants, industrial
oils and related
products (class L) —
Family C (Gears) —
Part 1: Specifications for lubricants for
enclosed gear systems
worm gears and hypoid gears. Industrial gear systems, which are either of open type or enclosed type, vary in size from small enclosed systems used in machine tools to very large systems used in steel mills and cement plants.
Lubricants for these applications vary in composition from refined straight mineral oils to complex blends of fatty oils and synthetic products. Some of these are treated with chemical additives to impart or enhance desirable performance properties. Viscosity grades also vary depending on the type of application, from the
low viscosity ISO VG 32 to high viscosity ISO VG 1 500. In exceptional cases, viscosity grades may be even higher. Temperature conditions to which the gear systems are exposed also vary considerably, due not only to the ambient conditions of operation but also to the proximity of the gear systems to heat sources, as in the case of cement plants.
This part of ISO 12925 has been formulated to cover lubricants for enclosed gear systems most commonly used by the industry. It does not cover extreme ranges of application in terms of gear design, operating temperatures and load conditions. For such applications, suppliers and purchasers of the lubricant should mutually agree on test methods and their acceptable limits not covered by this part of ISO 12925.
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