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Differences Between Closed-Circuit Gear Oil and Open-Circuit Gear Oil
Classification: Company News
May 07,2026
Differences Between Closed-Circuit Gear Oil and Open-Circuit Gear Oil:
Different Mechanical Applications:
Industrial closed-circuit gear oil is primarily used in enclosed oil tanks and gearboxes, such as reducers and equipment lubrication stations;
Open-circuit gear oil is primarily used in open gears, such as electric shovels, ball mills, and autogenous mills.
Viscosity differs:
Industrial closed-gear oil: Viscosity ranges from 100 to 460 at 40°C;
Open-gear oil: Most are semi-fluid greases, with viscosity ranging from 1,000 to 46,000 at 100°C;
Different Four-Ball PD Values:
Industrial closed-gear oil has a Four-Ball PD value of 250 kg or higher;
Open-gear oil has a Four-Ball PD value of 500 kg or higher.
Different Cohesiveness:
Industrial enclosed gear oil has significantly higher cohesiveness than open gear oil.
Therefore, industrial enclosed gear oil cannot be used as a substitute for open gear oil. Open gears require good adhesion and cohesiveness, and generally have higher viscosity. Using industrial enclosed gear oil as a substitute can lead to oil leaks, splashing, and other issues, resulting in lubrication failure, environmental pollution, and oil waste.
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