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How To Prime And Load A Grease Gun

In the market, you’ll get a variety of grease guns. And there are various options to prime and load your gun. But not all the process is clean and hazard-free. To find out the best way how to prime and load a grease gun, stick with us.

Grease guns are a common tool in any workshop or industry. They are mostly used in machine repairing and supplier stores, car garages, and industrial applications. A tacky grease or lubricant is pumped through the gun into the moveable parts of a machine. This job cannot be done manually or by hand. The grease gun makes the task easy, fast, and trouble-free. However, you’ll have to be careful so that the gun doesn’t leak when doing the job.

Whether pneumatic or manual, these grease guns are very useful in the case of applying lubrication to the machine parts. The tip with a long hose pipe can go into places that are hardly reachable by manual oiling. Oiling is required for any tool to increase its service life. It keeps the machine corrosion-free and runs like a knife through butter.

Priming and Loading a Grease Gun

Lubricating a machine is quite important for increasing the efficiency of the tool and its lifetime as well. Therefore, you need to know how you can perfectly prime and load a grease gun without messing things up. Whether you have a lever or pistol-grip manual gun, or a pneumatic or power luber electric gun, they have the same priming process. You can suction load a grease gun or manually prime it. But both of them are relatively time-consuming and messy.

So, how do you load a gun tube with grease in a swifty and mess-free way? Here’s how:

PROCESS: Load your grease gun with a Cartridge

(The Easiest and Most Mess-free Way)

Step- 1: In the very first step, you’ll have to detach the grease tube from the head of the gun. Now, if you’re a newbie, the head is on the side where the hose and grip is situated.

Step 2: Next, pull down the T-handle, and lock it into the tube in the cap using the notch in the rod. You may have to try it a few times, but that’s fine. Because, everyone has their first time.

Step 3: Now the tube is ready to receive the cartridge. But before you insert it, inspect the cartridge for any crushed ends or dents. If you find it faulty, don’t use it. Otherwise, it may cause lubricant bypass or hang up issues. Moreover, check on and follow if any special instruction is given by the manufacturer of the cartridge.

Step 4: Now after you’ve inserted the cartridge, pull the tab to remove the covering. Then thread the tube assembly back into the gunhead.

Step 5: When you’ve tightened the tube assembly fully, release the plunger rod from the end cap notch. This is required at this point, because it pushes the cartridge inside the tube to create pressure to release the grease.

Step 6: Now you need to release any trapped air inside between the gunhead inlet and cartridge.

How to Release Trapped Air Inside a Grease Gun?

To air out the vent, you can follow one of the two methods given below-

Method 1: Prime The first method of releasing air is through the vent valve or the air bleeder valve. It’s generally located on the gunhead. You can check out the instructions to get clear of the confusion.

Loosen the port of the valve halfway to release the trapped air, and wait until grease starts to come out of the vent or threads. You have to be really cautious as it will come out suddenly. Tighten the valve quickly to reduce any wastage.

Method 2: The second method is specially for the grease guns without vent valves, but equally useful for all the guns out there.

First, unthread the tube to one to two full turns. This way the air pocket escapes through the thread between the gunhead and the tube joint. And you can lock the plunger rod as per instruction given before to create more pressure to air out the vent for both of the methods. Stop as soon as you notice any lubrication release either from the vent or the thread or the rod cannot move any further. Tighten the tube to the head and close the vents.

When the gun releases grease flawlessly from the coupler when you press the trigger, apply a little pressure to the plunger rod and twist it until it easily slides into the tube. And the gun is ready to use.

NOTES: You need to consider a few factors relating to the grease you’re using.

*If you’re working in a cold environment and if the lubricant you’re using is tacky or thick in consistency, this process may take longer than usual. Also, some grease may flow slowly and you may lose some prime on a sudden stroke.

To reduce the possibility, follow the procedures- If it’s a manual gun, cycle your gun slowly and give full storkes with the handle. For pneumatic guns, reduce the air pressure. And set the electronic guns on it’s lowest setting until the grease comes out.

*Also, you need to consider some time for the grease to enter the head. But you can speed up the process by pre-packing the chamber with some grease using a spatula leaving the least air pocket possible.


We’ve shown here the easiest and fastest process to prime and load a grease gun. Another way to prime your gun is by suction loading. However, you can manually prime it with a spatula or your hand. But that is anyway a messy and time-consuming process. So, don’t opt for that unless you really have to.

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