Remove power. Pull out the washer from the wall, remove the back access panel. Locate the 9/16" nut ( on the left side facing from the back ) for the motor mounting plate. Loosen this nut, do not remove it. Once the nut is loosened, you can tap on the motor mounting plate with a hammer towards the left to tighten the belt....the belt should flex in and out approx. 1/4 of an inch when pushed against with your finger, this is the correct tightness.