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When dealing with a gearbox that has 3 feet,  there are two possibilities:
a) If the feet are located under the shaft and bearing housings,  view the gearbox as a normal 4 foot machine. This will give you inboard and outboard corrections for the feet. The end that has the 2 feet should be corrected evenly, and the 3rd foot should be corrected as per the screen.
b) If the feet are on the sides of the gearbox, or NOT under that shaft or bearing housings, then configure the gearbox as a 6 foot machine. This will give you corrections for the inboard, middle and outboard feet. Correct accordingly at each foot.

Filed under:
, by Ana Maria Delgado, CRL