LG · Laundry · DLEX4000B · Owner's Manual
Check that it is level front to back and side to side, and that all four leveling feet are in firm contact with the floor.
Source: LG DLEX4000B Owner's Manual, extracted pages 28-30
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Leveling the Dryer
Proper leveling is important for performance. The dryer must be level to help provide optimal drying performance. A perfectly level, solid floor helps minimize vibration, noise, and unwanted movement.
Before you begin - Wear long-sleeved gloves and safety glasses. - The appliance is heavy. Two or more people are required for installation. - If the dryer is being installed on the optional pedestal, use the leveling feet on the pedestal to level the appliance. The dryer’s own leveling feet should be fully retracted.
LG DLEX4000B Owner's Manual, extracted page 16Final installation checks and test run
Before using the dryer normally, make three final checks: levelness, airflow, and the installation test.
1) Check that the dryer is level Once the dryer is in its final location, recheck it to make sure it is level: - front to back - side to side - all four leveling feet should be in firm contact with the floor
LG DLEX4000B Owner's Manual, extracted pages 28-30This answer is only published when it has a reviewed answer status and a source citation back to the manual text.