If you notice water running out of your kitchen cabinet when you use the garbage disposal, one of the disposal's gaskets is likely the culprit. Most residential garbage disposals have four or five gaskets or seals that can break down over time and cause leaks. With a little time and effort, you should be able to replace the seals of your garbage disposal.
Shut off power to the circuit powering the disposal and unplug the disposal from the electrical outlet. If the disposal is wired directly to the circuit, shut off the power to the circuit and disconnect the garbage disposal power wires.
Take the screws out of the drain flange connected to the disposal unit. Remove the drain pipe. Pry the old gasket from the drain opening. Coat a new gasket with silicone sealant and insert it into the drain opening.
Twist the lower mounting ring one-quarter to one-half turn counterclockwise to remove the disposal unit from the mounting assembly. If it is stuck, insert a screwdriver into the mounting ring tab and tap it with a hammer. Unscrew the three screws holding the upper mounting ring in place. Remove the upper mounting ring and the backup ring that sits on top of it. Pull the sink flange out of the sink.
Remove the two sink gaskets from the underside of the sink or the top of the backup ring. Coat new sink gaskets with silicone sealant. Replace the sink flange, secure the new sink gaskets in place and reinstall the backup ring and upper mounting ring.
Remove the rubber cover from the lower mounting ring. There is a cover gasket below the rubber cover. Remove it and replace it with a new one that you have coated with silicone sealant. Connect the lower mounting ring to the upper mounting ring assembly.
Insert the disposal into the lower mounting assembly and lock the snap ring into place. Reconnect the drain hose and plug the disposal into the electrical outlet. Reconnect power to the circuit and test the disposal to ensure that it is working properly.