Why cant I get grease into zerk?

If you're having trouble getting grease into a zerk (grease fitting), there could be a few potential reasons. The most common issues are a blocked or damaged zerk, excessive back pressure in the lubrication system, or a problem with the grease gun itself. Let's explore these potential causes in more detail.

Blocked or Damaged Zerk

The zerk is the small fitting that allows you to inject grease into a component, such as a bearing or joint. If the zerk is blocked or damaged, it can prevent the grease from flowing through. This could be due to:

• Dirt, debris, or corrosion buildup in the zerk


• A damaged or deformed zerk that is no longer allowing grease to pass through


• The zerk being completely blocked, either from the inside or the outside

To address a blocked or damaged zerk, you may need to clean it out or replace it entirely. Use a zerk cleaning tool or a small wire to try and clear any blockages. If the zerk is damaged, it will need to be replaced.

Excessive Back Pressure

Another common issue is excessive back pressure in the lubrication system. This can happen if:

• The component being lubricated is already full of grease and can't accept any more


• There is a blockage or restriction somewhere else in the lubrication system


• The grease gun is not able to generate enough pressure to overcome the back pressure in the system

If you encounter excessive back pressure, you may need to relieve the pressure by removing the zerk and allowing the old grease to escape. You can also try using a higher-pressure grease gun to overcome the back pressure.

Problems with the Grease Gun

Finally, issues with the grease gun itself can prevent you from getting grease into the zerk. Make sure the grease gun is in good working order, with a properly functioning pump and hose. Check for any leaks or damage that could be reducing the gun's ability to generate pressure. You may also need to replace the grease cartridge or refill the gun with fresh grease.

By addressing these potential causes, you should be able to get grease flowing through the zerk and into the component that needs lubrication.

Can you overtighten a grease zerk fitting?

Can you over-grease a fitting? Yes. Only apply grease until you begin to feel resistance while pumping.

Why isn't grease going into zerk fitting?

It could be that grease gun tip and the zerk fitting are not well-matched, or the tip is worn. You can try to replace the tip with the new one that fits properly. Maybe it will work.

How to unclog grease zerks?

To unclog a grease zerk, remove the zerk and manually clean out the clog with a wire or a small tool, then use a penetrating oil and/or heat to help dissolve any remaining blockage. Alternatively, use a specialized tool like a grease joint rejuvenator to inject solvent into the fitting with high pressure and vibration. After clearing the clog, thoroughly clean the area and replace the zerk if needed before re-greasing.
 
This video demonstrates how to unclog a grease zerk using heat: 59sReal Man SkillsYouTube · Apr 23, 2023
Method 1: Manual cleaning and solvent

1. Remove any surface grease: Clean the area around the zerk with a rag or brush. 
2. Remove the zerk: Use an open-end wrench to unscrew the zerk from the fitting. 
3. Manually clean: Use a small wire, such as a welding rod or a small screwdriver, to dig out any debris from the zerk's opening. 
4. Apply penetrating oil: Spray a penetrating oil into the zerk to help dissolve any hardened grease. Let it sit for a while to work. 
5. Force grease: After using the penetrating oil, attach your grease gun and try to force fresh grease through. You may need to use a heavy-duty grease gun for more pressure. 

Method 2: Using a special tool

1. Use a "Grease Joint Rejuvenator" or "Grease Buster" tool: These tools are designed specifically for this purpose. 
2. Add solvent: Follow the tool's instructions to fill it with penetrating oil or a solvent, minimizing air bubbles. 
3. Attach and activate: Secure the tool to the zerk, then tap the end with a hammer to force the solvent into the fitting. The vibration helps break up the clog. 
4. Re-grease: Once the solvent has been forced in, the fitting should be clear and ready to take grease. 

Method 3: Heat

1. Apply heat: Use a heat gun or torch on a low setting to warm the zerk. 
2. Watch for grease to soften: As the zerk heats up, you should see hardened grease soften and start to ooze out. 
3. Grease the fitting: Once the clog has melted, try to grease the fitting normally. If the zerk is still stubborn, you may need to combine this method with one of the other options. 

Important considerations

• Avoid forcing too hard: Forcing grease with excessive pressure can cause damage to the bearing's seal, allowing contaminants to enter and lubricant to leak out. 
• Replace if necessary: If a zerk is damaged or remains clogged, it is best to replace it. 

Do grease nipples get blocked?

Coupler: this is where the grease gun directly connects with the grease nipple, so it's important to ensure it's kept clean and clear to avoid blockages.