Struggling to refill your grease gun? Whether you’re new to tools or just doing routine maintenance, learning how to refill and prime your grease gun is essential for smooth operation.

In this guide, we’ll walk you through two easy methods using a grease cartridge or filling from a grease tub. Each step is explained clearly, so you can get back to lubricating with confidence.

Why You Need to Properly Fill and Prime a Grease Gun

A properly loaded grease gun keeps your machines and tools well-lubricated, prevents wear and tear, and ensures optimal performance.

Method 1: How to Load a Grease Gun Using a Cartridge

Step 1: Unscrew the Nozzle Cap

• Hold the grease gun upright with the nozzle pointing upward.
• Firmly twist the barrel clockwise to detach it from the nozzle.
• Set the nozzle head aside for reassembly later.

Step 2: Pull Back and Lock the Plunger Handle

• Find the T-shaped handle at the end of the barrel.
• Pull it back fully this draws back the plunger rod inside.
• Lock it in place (some handles click automatically, others need a twist to secure).

Warning: Don’t let the handle snap back, as it’s spring-loaded and can hurt your hand.

Step 3: Remove the Used Cartridge

• Once the handle is locked, tip the barrel downward to let the old cartridge slide out.
• If it sticks, gently pull it out by hand.
• Discard the used cartridge responsibly.

Step 4: Prepare the New Cartridge

• Use the grease type recommended in your machine’s manual.
• Remove the plastic cap from one end of the new cartridge.
• Make sure it matches your gun (usually 14oz or 16oz).

Step 5: Insert the New Cartridge

• Wipe the barrel clean before inserting the new cartridge.
• Slide the open end into the barrel and push it down.
• Peel off or puncture the metal seal from the other end.

Important: Insert the cartridge the right way wrong orientation means no grease flow.

Step 6: Reassemble and Release the Plunger

• Lightly screw the nozzle back onto the barrel just 1–2 turns.
• Release the plunger handle so it pushes into the cartridge.
• Finish tightening the nozzle until it’s snug.

Step 7: Prime the Gun

• Aim the nozzle at a paper towel or cloth.
• Begin pumping the trigger until grease starts flowing.

Tip: If nothing comes out, loosen the air bleeder valve (if your gun has one) or remove the air plug to release trapped air.

Method 2: Filling a Grease Gun from a Tub

Step 1: Remove the Nozzle

• Hold the gun with the nozzle down.
• Unscrew the barrel from the nozzle head and set the head aside.

Step 2: Insert Barrel into the Grease Tub

• Use the grease your tool or machine recommends.
• Push the barrel’s open end about 2 inches into the grease.

Avoid air pockets by keeping the barrel submerged while filling.

Step 3: Pull Back the Handle to Load the Grease

• Slowly pull the handle straight out to draw grease into the barrel.
• As you pull, sink the barrel deeper to avoid trapping air.
• Twist or click the handle to lock it in place.

Step 4: Clean the Barrel

• Remove the barrel from the grease tub.
• Wipe off excess grease with a cloth to prevent mess during assembly.

Step 5: Reassemble and Prime

• Screw the nozzle cap loosely back onto the barrel.
• Push the handle in slowly to expel trapped air.
• Once the handle is fully in, tighten the nozzle firmly.

Step 6: Pump to Prime

• Pump the trigger while aiming at a cloth.
• Keep pumping until you see grease coming out cleanly.

Final Thoughts: Keeping Your Grease Gun Ready for Action

Regularly refilling and priming your grease gun ensures consistent lubrication for your equipment, whether you’re maintaining a lawn mower, truck, or factory machinery.

Pro Tips for Better Performance

• Always use the correct grease type and cartridge size.
• Store your grease gun in a clean, dry area.
• Wipe down the nozzle after every use to prevent clogging.
• Check out our Grease Gun Maintenance Guide and Top-Rated Grease Gun Reviews for more tips.

FAQs

Q: What’s the easiest method for beginners?
A: Cartridge replacement is easier and cleaner for beginners than tub-filling.

Q: Why is my grease gun not priming?
A: You likely have an airlock loosen the bleeder valve or unscrew the top plug slightly to vent it out.

Q: Can I reuse leftover grease from the tub?
A: Yes, as long as it’s uncontaminated and still within its shelf life.

Ready to Get Greasing?

Make your maintenance hassle-free whether you’re a DIYer or a small business owner. Keep your tools running smoothly and extend their life with a properly primed grease gun.