Turn the unit back upright and loosen the screw on the back of the control panel on each end until it slides forward. Under the panel is a couple brass colored clips that hold the cabinet to the rear panel. Pop those off with a flat blade screwdriver, then take a hold of the cabinet from the front and tilt it toward you then move it out of the way. The pump can be removed by taking the clips off, then remove the two screws holding the motor clips and take them off also. Take the motor in hand and the coupler will be on the back. Reassembly is just opposite the way it came apart.