How do I properly level the washer during installation?

Check levelness by placing a level on the top edge of the washer, first side to side, then front to back. If the washer is not level, prop the front with a wood block and adjust the feet as necessary, then prop the back and adjust; repeat until the washer is level and all four feet are stable on the floor. After leveling, use a 17 mm open-end wrench to tighten the nuts on all four feet tightly against the washer cabinet, as loose nuts can cause vibration. (Page 10)