To keep outdoor conveyors creeping slowly in cold weather thus preventing freeze up of idlers and belts.
Allows slow rotation of equipment during off days as often used in paper mill machinery.
To provide a slow speed for visual inspection of machinery such as long belt conveyors.
To provide precise positioning of heavy equipment such as batch mills.
Allows the main drive to reach a self sustaining speed during start-up such as large diesel or gas turbine starter drives.
To provide emergency drive for large equipment that would be damaged in the event of a sudden failure of the main drive. This application is used extensively in gas turbine, hot gas fans, rotary kilns and furnaces where the heat could cause distortion of the machinery if it were to remain at rest during a drive failure.