There are many other causes for shaking, though.
#1 The cabinet may not be locking to the frame firmly. There is a shim kit available to remedy that.
#2 The rear leg linkage may be collapsed. Simply lean the machine forward and set it back down on the rear legs to reset the linkage.
#3 Even the floor itself can be the cause. If the machine is on Pergo flooring it will shake because of the soft padding undernieth. If the machine is on a plywood floor that is not very solid, it will shake.
There is not one simple solution for shaking. Each situation is unique.
Matt
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