Step 3: Remove the Screw Holding in the Pump.
The part on the right is the air pump. The part on the left is a motor. When the motor is on it oscillates the magnates back and forth, vibrating the diaphragms to suck in air.
We are going to focus on just the pump. To make the adjustment we need to remove the pump from the case. Do this by removing the screw holding it in.