How to Clean and Re-Grease Covered Guitar Tuners (Fender & Others)

Updated at: 09/03/2025

Covered guitar tuners, those elegant, sealed mechanisms adorning your Fender or other brand instrument, are vital for tuning stability and longevity. However, over time, dust, grime, and old lubricant can accumulate inside, hindering their smooth operation and potentially leading to tuning inaccuracies or even breakage. Neglecting their upkeep can result in frustrating tuning experiences and costly repairs down the line. This is especially true in environments with high humidity or dust levels.

Regular cleaning and relubrication are crucial for maintaining the precision and longevity of your tuning machines. This simple process, requiring only a few basic tools and supplies, will revitalize your tuners and ensure years of reliable performance. Let's dive into the step-by-step guide that will show you exactly how to clean and re-grease your covered guitar tuners effectively and safely.

Preparation and Safety Guidelines

Tools Needed
  • Screwdriver (small, Phillips head)
  • Shop towels
  • Dixie cups
  • Naptha or oil-based cleaner
  • Toothbrush (old)
  • Toothpick
  • Lithium grease
  • Q-tip (optional)
Safety Guidelines
  • Always power down your amplifier and disconnect the guitar from any power source before starting any cleaning or maintenance.
  • Use only appropriate cleaning solutions and lubricants designed for musical instruments. Avoid harsh chemicals or solvents that can damage the finish or internal components.
  • Be gentle when handling the tuner gears and other delicate parts. Excessive force can cause damage or breakage.

Step-by-Step Instructions

  1. Prepare the Tuner

    • Loosen the string and remove it from the tuner post.
    Loosen the string and remove it from the tuner post.
    Prepare the Tuner

  2. Remove the Tuner

    • Remove the tuner cover using a small screwdriver.
    • Remove the internal tuner plate by gently applying leverage to the tuning key.
    Remove the internal tuner plate by gently applying leverage to the tuning key.Remove the internal tuner plate by gently applying leverage to the tuning key.
    Remove the Tuner

  3. Clean the Tuner Parts

    • Clean the tuner parts using an oil-based cleaner (naptha) and a toothbrush. Remove any metal shavings or hardened grease with the toothbrush and toothpick. Pay close attention to the worm gear and spur gear.
    • Clean the tuner cover with a toothbrush or Q-tip to remove any dried residue.
    Clean the tuner cover with a toothbrush or Q-tip to remove any dried residue.Clean the tuner cover with a toothbrush or Q-tip to remove any dried residue.Clean the tuner cover with a toothbrush or Q-tip to remove any dried residue.
    Clean the Tuner Parts

  4. Grease the Tuner

    • Apply a small amount of lithium grease to the worm gear and spur gear using a toothpick.

  5. Reassemble the Tuner

    • Reassemble the tuner, ensuring the correct orientation for the guitar headstock.
    • Wipe off excess grease from the tuner post with a naphtha-soaked rag. Be careful not to get grease on the guitar's finish.
    • Reinstall the tuner and tighten the screws gently.
    Reinstall the tuner and tighten the screws gently.Reinstall the tuner and tighten the screws gently.Reinstall the tuner and tighten the screws gently.Reinstall the tuner and tighten the screws gently.
    Reassemble the Tuner

  6. Finalize

    • Reinstall the string and tune the guitar.
    Reinstall the string and tune the guitar.Reinstall the string and tune the guitar.
    Finalize

Read more: Fixing Loose Acoustic Guitar Tuners: The Toothpick & Glue Method

Tips

  • Use oil-based cleaning agents for oil-based components like grease.
  • Use a parts tray to keep track of small screws.
  • Do not use WD-40 or other penetrating oils for lubrication; they can damage the finish.
  • It's okay to use a generous amount of grease on covered tuners, as it won't be exposed to the environment.
  • Clean your fingers and the tuner post after applying grease to avoid transferring grease to the guitar's finish.

Common Mistakes to Avoid

1. Using the wrong type of lubricant

Reason: Using the wrong lubricant (like WD-40) can attract dust and dirt, gumming up the gears and causing worse issues than before.
Solution: Use a dedicated guitar tuner lubricant, such as a light machine oil or a specialized gear lubricant.

2. Over-lubrication

Reason: Too much lubricant can attract even more dirt and grime, slowing down the tuners and creating a sticky mess.
Solution: Apply only a tiny drop of lubricant to the gear teeth, then wipe off any excess.

3. Not cleaning thoroughly before re-lubricating

Reason: Old grease and grime mixed with new lubricant creates a thick, sticky residue that hinders smooth tuning.
Solution: Thoroughly clean the tuner gears and shafts with a degreaser and a soft brush before applying new lubricant.

FAQs

What type of lubricant should I use for my guitar tuners?
Use a high-quality, light machine oil or a specialized guitar tuner lubricant. Avoid heavy greases or oils, as they can attract dust and slow down the tuner's mechanism. A small amount goes a long way.
My tuner still feels stiff after cleaning and relubrication. What should I do?
If your tuner remains stiff, there might be more significant issues beyond simple cleaning and lubrication. Examine the tuner carefully for any signs of damage or broken parts. If you're not comfortable disassembling the tuner yourself, consult a professional guitar technician.
Keeping your guitar tuners in top condition is crucial for maintaining tuning stability. Whether you've recently upgraded to a vibrant new set – perhaps you've even checked out our guide to the best pink tuners, – or are simply looking to maintain your existing ones, regular cleaning and regreasing is essential. This guide will walk you through the process of cleaning and lubricating covered guitar tuners, covering both Fender and other brands.