WM-1412SW - LG Washing Machine Service Manual (repair manual). Page 12

Check the horizontality with a level (Gage).

8

If washing machine legs are loose or not fully attached, then 

tighten

with  the spanner wrench. 

Using the level, level the washing machine from front to back and side to side.

Use the spanner wrench to adjust legs until level and try the 

.

Perform a Rinse and Spin with some clothing in the machine.

To do this, put 2~3kg of clothing in the unit, turn on the unit, select the Rinse+Spin 
and then start. When the unit reaches the spin cycle, check vibrations.
If the unit vibrates, adjust the leveling foot slightly until the vibration subside. (Repeat step 2) 

Lower the foot until there is no gap between floor and foot.
And only use 

when the gap  is more than 

.

Place your right hand on the back, right corner and your left hand on the front,
left corner of the unit, then attempt to rock the unit from corner to corner.
Then, move your right hand to the front, right corner and your left hand to the
back, left corner and attempt to rock the unit from corner to corner.

If the unit is level, it will not rock.  However, if the unit is not level, it will rock.
If the unit rocks, it will be necessary to adjust the leveling feet of the unit.
Adjust the foot on the front right corner. 

A level

Lower

Tighten

Adjustable feet

Loosen

Adjustable feet

Higher

Tighten

Adjustable feet

Lower

4620ER4002B
(Gray)

for Wooden floors

Rubber Cup

4620ER4002A
(Black)

for Tile floors

Lock nut

10mm

Adjustable bolt

Tighen the lock nut

Floor

No Gap

Floor

No Gap

Floor

Gap