Level the Washer
Unplug the front-loading washing machine. Check if the feet of the washer are securely on the floor. If they are not, use the wrench to extend them until they reach the floor and provide a solid base.
Place the level on the washer parallel with the front of the washer. If the bubble is to the left of the center line, raise the right legs until it reads level (bubble between two center lines); if the bubble is to the right of center, raise the left legs. If the bubble lies between the two center lines, go to the next step.
Place the level on the washer parallel with the side of the washer. If the bubble is towards the front of the washer, raise the back legs; if the bubble is towards the back of the washer, raise the front legs.
Use the shims if you are unable to level the washer with the legs fully extended, or if you are unable to get the legs to reach the floor. Slide the shims along the floor, under the leg that needs to be raised further or that is not reaching the floor, until it touches the leg. Give it a little extra push to set it in securely. Snap off the remainder of the shim that is sticking out. Plastic shims have pre-cut lines and will snap cleanly when you pull up. For wood shims, slice across the shim with the utility knife a couple of times and pull up. It will snap at the line you cut.
Check the level of the washer again in both directions. You may need to make small adjustments of the legs back and forth until it is fully level.