The grease gun is a handy tool for many different jobs. It’s not just used for grease but can also be used for oil or transmission fluid. A good mechanic should always have one around. Here are some basic instructions to get you started. They will help you maintain your gun so it will do the job it was intended for.
Separating the grease gun barrel from the handle. If possible, try to separate the barrel from the handle by pulling the gun completely out of the barrel with a wrench. If you only have access to small bulk grease at a local hardware store, grease guns can generally be loaded more quickly by just unscrewing the barrel from the handle.
If your new grease gun doesn’t come with an air lock, insert a long screw into the back (by the way this is where you put the cap back on). This is called a pop-up air lock. This will keep the gun from firing until you have the air cylinder refilled with new grease. If it doesn’t come with an air lock, you may also install one on your own by using some kind of spring mechanism.
Attach the rod handle in the same way you attached the cap to the cap. Slide the two together and screw them down. This will hold the rod handle in place while you load the gun. You will now need to pull the needle valve handle up to release the grease gun. If it doesn’t come with one, you will probably need to buy one.
The final step is to pull the plunger up and down to release the gun. Once you are sure you can reach the bottom of the cap, just unscrew it and replace it with the new grease cartridge. You may need to use some pliers to hold the plunger firmly in place.
Some of these fittings are very easy to install and they don’t require much more than a few minutes of work. But others are a bit more complicated. For example, the oil seal device for a belt drive transmission may be a bit more complex to install. And if you choose a grease gun that doesn’t have an air lock, you will have to remove the bearing and lubricate it yourself. There are dozens of different types of grease fittings available, but they all perform the same basic task.
A typical grease gun will have a top handle, a crank handle, and a crankarm. The top handle is meant to make it easier to turn the crank while simultaneously applying friction to the piston rod. The crank handle and crankarm are meant to help keep the grease tube clean between uses. And most crankarms are conveniently designed to hold a wide range of standard types of grease tubes, including small diameter tube and large diameter tube. The type of grease tube you choose depends on the application you prefer.
In order to complete step 2, you must remove the rod from its housing and place it on the grease gun’s t-handle. Then slide it up and down in order to apply enough friction to the rod. Release the rod when it is completely installed back into its housing. Grease is usually supplied in small tubes that fit securely on the top and bottom of the crankarm. You will need to fill the tubes with the lubricant, then insert the tube into the crankarm, and turn it on to apply the grease. It may take a few tries to get the first tube full but don’t worry; it should only take a few seconds.