I have the KitchenAid beverage center Model KUBL304ESS. The unit is making a loud rumbling/vibrating noise.

SOURCE: 12 year ol KitchenAid Superba 42 making a loud rumbling noise intermittantly.

Put a screwdriver on the compressor with the handle on your ear and listen. If you hear the loud grumbling noise from the compressor you're probably better off replacing the fridge.

Do the same with the fan motor. If it's the fan motor, you can easily replace that.

SOURCE: LG LRFC25750 Refrigerator French Door

Freezer section evaporator fan motor bearing are going out. This would be indicted by a high pitched squealing noise. Have the fan motor replaced and it should solve your problem.

SOURCE: loud noise from the freezer side

The problem is a buildup of ice on the plastic housing (the curved plastic bit) in the back of the freezer under the fixed shelf where the icetub goes. The fan behind this plastic housing is hitting the ice when the defrost comes on.

Unplug the fridge, unpack the freezer, remove the four screws in the back, take off the sheetmetal backing and let the fridge thaw. You can remove the plastic piece after a while and get the ice off (be careful not to remove the styrofoam insulation by going too quickly).

Reassemble and you're back in business, for a few months. I'm never buying Samsung again myself.

SOURCE: pump motor makes loud noise when pump comes on

If this is a high pitched sound, then this sounds like you have bearings that are starting to go out.  There is not much that you can do to prevent eventual failure.
The only other option that I see is that there is something causing friction inside the pump between the impeller and diffuser.  

SOURCE: Model KM-450MAB--Ice Machine Making Beaping Noise

Keeps on beeping? Every 3 to 4 seconds? Try putting the thermostat wires together. An open bin thermostat will cause this problem and the board see it and starts beeping.