When taking individual soft foot readings on a four-footed machine,  one foot at a time, always with the other three feet tight, if the two highest values appear diagonally opposed to each other, you have “rocking” soft foot situation. There are three potentially correct shimming solutions to this problem, but only one best solution.
Here’s how to find it: Loosen both diagonally opposed soft feet, leaving the two not soft feet tight. Feel the shim packs. If one is loose and one is snug, mike the air gap that appears under the loose one and shim that one by the amount of the air gap. If both shim packs are loose, shim both feet, by roughly half the soft foot value you got for each of them individually, or mike the airgaps with both of them loose and shim those amounts individually at each soft foot respectively. There are subtleties involved with this procedure that are best learned in an in-depth training course, but this will already go a long way toward solving these problems. Note If your two largest soft foot values do not appear diagonally opposed, you do not have a rocking problem, and other causes and solutions must be explored, again best learned through specialized training.

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, by Pedro Casanova CRL