All gearboxes should be the product of one manufacturer and specified to be capable of withstanding an overload torque of 300% of full-load motor torque.

The GB reduces rotation speed from the input shaft to the output shaft by a factor of about 30:1 and increases available torque by about the same amount. It is designed to not to be overloaded. The unit most be maintained fairly well balanced (weights adjusted to keep motor and GB loads about the same on up/downstroke) to make sure the GB is not overloaded in opeation. lso maintenance includes checking the condition of the lubricant in the GB. Older GB’s may need the addition of a wiper if they are to turn less than about 5 SPM (strokes per minute). Newer GB’s are sold with the wiper already installed.