Monitor Arm Gas Spring Leaking Oil or Hissing: Is It Failing?

Quick Answer: If the gas spring drips oil or hisses while the arm loses lift, stop relying on it and replace the spring or the arm.

• Oil or hissing, but the arm still holds: Clean it and track the lift. Use Fix A to clean and monitor the spring
• Oil or hissing, and the arm sinks: The spring is failing. Use Fix B to replace the gas spring
• No replacement spring exists for your arm: Replace the whole arm. Use Fix C to choose a new arm
• Not sure the oil comes from the spring: Go to Step 1 to trace it

• Difficulty: Easy to diagnose; moderate to advanced to replace, depending on the arm's procedure.
• Tools: A flashlight, paper towels, painter's tape, and the hex keys supplied with the arm.

Jump to:

• Step 1 - Confirm the Spring Is Leaking and Losing Lift
• Step 2 - Track, Replace the Spring, or Replace the Arm
• Step 3 - Check the Lift Holds Steady
• Common Mistakes
• FAQ

What Oil and Hissing Mean in a Gas Spring

A gas spring is a sealed cylinder holding pressurized gas and a small amount of oil. The oil lubricates the seal where the rod slides in and out.

When that seal wears, oil can escape along the rod and gas can escape with it, sometimes with a hiss. Less gas means less push, so the arm slowly loses its ability to hold the monitor.

A thin, even film on a polished rod is common. Oil that runs, drips, or collects is the warning sign, especially when lift is also dropping.

Problem state: A worn seal lets oil and gas escape, so the spring's push weakens and the arm needs more tension each week to hold the same monitor.

Corrected state: The arm runs on a sound spring that holds the monitor at a stable tension setting with no running oil.

Critical Safety Warning: A failing gas spring can lose lift unpredictably, letting the monitor drop. It is still a pressurized cylinder even while leaking, and can release suddenly if damaged.

This happens when a leaking arm stays in use at full height, or when the spring is opened, heated, or punctured.

• If the arm sinks, keep the monitor low over the desk until the spring is replaced, and don't work with your face close under it.
• Remove the monitor with the arm in the removal position its instructions specify, and don't pull the empty arm down by hand.
• Never open, drill, heat, cut, or puncture the gas spring.

For disposal, follow the arm maker's instructions or your local rules for pressurized parts.

Step 1 - Confirm the Spring Is Leaking and Losing Lift

Arms contain grease at their joints as well as oil in the spring. Make sure the oil is coming from the spring before deciding it has failed.

1. Trace the oil: With a flashlight, follow the streak upward. Spring oil starts where the rod enters the cylinder; joint grease is thick and sits around a pivot.
2. Listen while still: A brief soft sound during movement can come from gas flowing inside the spring. A hiss that continues when the arm is still points to a leak.
3. Mark the lift: Put painter's tape at the screen's top edge at your working height, release, and check the next day without changing the tension.

What you found decides the next step:

• Spring oil or hiss, but the screen stays at the tape: Go to Fix A.
• Spring oil or hiss, and the screen sinks: Go to Fix B, or Fix C if no spring is sold for your arm.
• Only joint grease, no hiss, steady lift: The spring isn't leaking. Wipe the excess grease; nothing else is needed.
• The arm sinks with no oil or hiss: This may not be a leak. See Why Does My Monitor Arm Keep Falling Down?, or Monitor Arm Sinking in a Cold Room if it happens only when the room is cold.

Step 2 - Track, Replace the Spring, or Replace the Arm

Fix B depends on your arm's model. Find the model name on its label and check the maker's support page for a listed replacement gas spring and its replacement procedure.

If neither a part nor a procedure is listed, use Fix C.

Fix A - Clean the Spring and Track the Lift

Use when: The spring shows oil or a hiss, but the screen still holds at the tape mark.

Before you start: Wipe the spring only with the monitor resting at a low height, and keep your hands off the rod while the arm moves. See why a leaking spring is unpredictable.

1. Wipe the outside clean: Use a dry paper towel on the cylinder and the area below it. Don't use solvent on the rod or seal.
2. Note the tension setting: Count or mark the tension screw's current position.
3. Recheck weekly: Look for fresh oil and check the screen against the tape mark.
4. Plan the replacement: Check now whether your arm's maker sells a replacement spring, so you're ready.

Check: No fresh oil appears and the screen stays at the tape without adding tension. Go to Step 3. If oil returns or you need more tension to hold the same height, replace the spring with Fix B.

Fix B - Replace the Gas Spring

Use when: The spring is leaking and the arm is losing lift, and the maker sells a replacement spring for your model.

Before you start: A spring swap means working directly on a pressurized part, so follow only the maker's procedure, step by step. Read the pressurized-part precautions.

You need: The replacement spring listed for your exact model, its stated weight range, and the maker's procedure.

1. Match the part: Confirm the part number fits your model and its range includes your monitor's weight.
2. Remove the monitor: Take it off in the arm's removal position.
3. Follow the procedure exactly: If it asks for anything you can't do safely, stop and use the maker's service.
4. Remount and tune: Reattach the monitor and set the tension until it holds at your working height.

Check: The arm holds the monitor with no fresh oil. Go to Step 3 to confirm.

Fix C - Replace the Whole Arm

Use when: No replacement spring is sold for your arm, or the arm has other worn parts.

Before you start: Take the monitor off before removing the old arm's clamp, because a loose clamp under load can tip the arm off the desk. Review how to unload the arm.

Choose the new arm against these points:

• Weight range: Your monitor's weight without its stand sits inside the range, not at either end.
• VESA pattern: The arm lists your monitor's exact pattern.
• Desk fit: The clamp or grommet range covers your desktop thickness.
• Serviceability: A maker that sells replacement springs saves replacing the whole arm next time.

Check: The new arm holds the monitor at your working height. Go to Step 3.

Step 3 - Check the Lift Holds Steady

Set the screen at the tape mark and leave the tension unchanged. Check the mark and the spring area the next day and again after a week.

PASS: The screen stays at the tape mark at an unchanged tension setting, no oil runs or collects, and no hiss is heard while the arm is still.

FAIL: The screen sinks below the mark, fresh oil appears, or the hiss continues.

NEXT ACTION:

• Sinking on the original spring: The leak has reached the lift. Move to Fix B or Fix C, and keep the monitor low meanwhile.
• Fresh oil on a new spring: Stop using it and contact the seller about the replacement part.
• New spring holds but the arm rises: Lower the tension. If it rises even at minimum, see Monitor Arm Won't Stay Down With a Light Monitor.

Common Mistakes

Mistake: Turning the tension up week after week to cover the leak.

What happens: The arm seems fine until the adjuster runs out, and then the monitor sinks with no reserve left.

Instead: Treat a rising tension need as the replacement signal.

Mistake: Oiling the rod to stop the hiss.

What happens: Outside oil doesn't reach the worn seal and only collects dust.

Instead: Keep the outside clean and replace the spring when lift drops.

FAQ

Can a leaking gas spring be refilled?

Not by a user. It is a sealed pressure part, so it is replaced as a unit.

This guide covers gas spring monitor arms. Replacement steps depend on the arm model and should follow its maker's procedure.

Written and edited by Lio Lim

Every guide on The ErgoDesk Lab is reviewed before it goes live so each step leads to a clear next action. Spotted something unclear or wrong? Let us know, or read how these guides are made.