my desk makes a loud grinding or clicking noise from one leg when it moves.

Diagnosis

The loud grinding or clicking noise in an ApexDesk Elite Series leg is typically caused by a misalignment in the internal drive screw or the accumulation of particulate debris within the telescoping column. Because these desks utilize a precision-threaded lead screw to lift the heavy desktop, even a small piece of grit, a stray metal shaving from the manufacturing process, or a dried-out lubricant patch can create a "catch" point. When the motor forces the column past this obstruction, it produces a rhythmic clicking or a harsh grinding sound. If the noise is a consistent, high-pitched grind, the issue is likely localized to the gearbox at the base of the leg where the motor converts high-speed rotation into high-torque lift. If the noise is intermittent or happens only at specific heights, the problem is almost certainly a physical obstruction or a "flat spot" on the internal nylon bushings. You can confirm this by manually lowering the desk to its lowest setting and inspecting the gap between the inner and outer columns for any visible metallic flakes or dust buildup.

How to Fix It

To resolve debris-related noise and reset the column alignment, follow these precise steps:

1. Lower the desk to its absolute minimum height using the control panel. Ensure the desk is fully seated so there is maximum exposure to the upper telescoping segments.
2. Using a high-powered vacuum with a narrow crevice tool attachment, run the nozzle along the entire perimeter of the leg seam. Focus specifically on the gap where the inner column slides into the outer housing.
3. While holding the "Down" button to keep the motor engaged, slowly move the desk up and down in 2-inch increments. As the desk moves, continue vacuuming the seams to pull out any trapped particles that are shifted by the movement.
4. Apply a small amount of high-grade white lithium grease to the exposed part of the inner column. Avoid using WD-40, as it is a solvent and will strip the factory lubricant.
5. Perform a "Hard Reset": Unplug the power cable from the wall and the control box. Wait 60 seconds. Plug it back in and hold the "Down" button for 10 seconds until the desk performs a calibration dip (moving down and then slightly back up).

If That Didn't Work

• Check for Leveling Imbalance: If the desk is not perfectly level, the legs will "cock" at a slight angle, causing the internal screw to bind against the housing. Use a bubble level on the desktop. Adjust the leveling feet at the bottom of each leg by rotating them clockwise or counter-clockwise until the desktop is perfectly horizontal. Even a 2-degree tilt can cause grinding.
• Inspect the Gearbox Housing: If the grinding is coming from the very bottom of the leg, the motor mount may have loosened. Check the four mounting bolts securing the motor to the leg column. If any are loose, use a 4mm Allen key to tighten them firmly. A shifting motor causes the drive gear to misalign with the lead screw.
• Verify Load Distribution: If you have heavy monitors or a PC tower concentrated on the side of the noisy leg, the column may be bowing slightly. Shift your equipment toward the center of the desk and test the movement. If the noise disappears, you are exceeding the dynamic weight limit for that specific leg.
• Replace the Leg Column: If the clicking is rhythmic and persists after cleaning and leveling, the internal helical gear has likely suffered a tooth failure. This is an internal mechanical failure that cannot be repaired by cleaning. You will need to replace the entire leg assembly (Part #AD-ELITE-LEG-S).

Heads Up

• Never apply silicone spray or oil to the exterior of the legs; this attracts dust and hair, which eventually works its way into the gear mechanism and causes the very grinding you are trying to fix.
• Avoid "stuttering" the buttons (rapidly pressing up and down). This can cause the motor to jerk, potentially stripping the nylon bushings inside the Elite Series columns.
• Periodically check the cable management trays. If a cable is sagging and pressing against the telescoping leg, it can create a rubbing sound that mimics a mechanical grind.
• Always ensure the desk is unplugged for at least one minute before attempting any physical adjustments to the motor or gearbox to avoid accidental activation.