How to Change Grease Fittings

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Grease fittings are a vital part of maintaining your equipment's longevity, but what happens when they give you problems? Over time, these fittings may become worn or damaged, and require replacement.

In this article, we'll guide you through the simple process of changing grease fittings as well as the different types of grease fittings you will run into.

Types of Grease Fittings and Threads

Before starting, it's essential to know that there are two types of grease fittings: screw-in and drive-in. Screw-in fittings have threads on the bottom and a hex head on top, while drive-in fittings have a round edge below the nipple. Knowing which type you have is crucial before beginning the replacement process. Additionally, it's essential to ensure that you have the correct thread size for your fitting. While most fittings have universal ends, the threads can differ.

Be sure to double-check the type of fittings for your grease zerk to avoid any issues. To do this, do one of three things: look up the exact grease zerk yourself, get in touch with the part manufacturer for details, or simply remove the grease zerk and bring it along to your local parts store when you go to purchase the replacement grease fittings. All of these options will help to ensure you are buying the right hardware for your specific part.

Changing Screw-In Grease Fittings

To remove a screw-in grease fitting, you will need a ratchet and socket or an appropriate tool to fit the fitting. Before unscrewing, clean the surface around the fitting to prevent debris from falling into the hole. Once unscrewed, replace with the new fitting, making sure to check for a plug in the existing fitting.

Changing Drive-In Grease Fittings

Removing drive-in grease fittings can be challenging, but it's not impossible. Start by using vice grips to grip the top of the grease fitting tightly and rotate to loosen. Next, use the claw on a claw-headed hammer to grip and pull up on the grease fitting to pull it out of the hole. Pull up gently making sure not to break the end off. 

Pro Tip: You may need a second hammer to tap the end of the claw-headed hammer to force a better grip onto the grease fitting giving you more leverage when pulling up.

To install your new drive-in grease fitting, take the appropriate size socket and place it over the end of the fitting. Drive the fitting down into the hole, making sure not to damage the grease zerk. You may need to tap the fitting gently with a hammer. As with the screw-in grease fitting, be careful not to damage the end of the fitting during installation.

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Changing your grease fittings is a simple process that requires a few simple tools, depending on the type of fitting. Knowing the type of fitting you have and the appropriate replacement part is vital to maintaining your equipment.

If you have questions about any of the steps outlined above or are just more of a visual learner, head over to our YouTube channel and watch our step-by-step video (also attached below)! Leave a comment or question and receive a personal reply from Brent, our resident John Deere expert. Be sure to subscribe!