A grease gun (plastic-tipped) is a standard workshop tool used for lubricating. The function of the grease gun is basically to apply grease to a particular point, usually within a grease block or grease fitting. The channels within the grease block lead to where the grease is required. You can use them for general application or specialist applications, as they come with many different adaptors for different uses.
A typical example is the blow-up air compressor, sometimes known as a ‘whirling dervish’. These have a long plastic tube (the intake port) and two other plastic tubes; one in the top section, the other one (the intake tube) runs under the motor housing. They are often referred to as an ‘intake’ or ‘expression’ port because the intake port of a normal grease gun has a very small opening. Grease is blown into this slot, which is almost always a closed circle, by the air compressor’s air intake hose. A regular air compressor has a very large intake port, which is why it is called an ‘intake’ port. This is very different to that of a grease gun, which has a much smaller open area (the air compressor’s intake port).
One key feature to note when working with a grease gun, is that it is set up to operate with a pressurized lever. When you look down the barrel of the gun, you will see a lever, which is typically blue – indicating a high pressure setting. The lever will change colour when the pressure increases. The lever also moves up and down, which indicates the increase in pressure. The larger the size of the nozzle, the higher the pressure generated.
To operate a grease gun, you must place it in a vertical position. Next, you must place the appropriate air tank in place, which will need to be securely strapped around the bottom of the barrel. Next, you must place the trigger, or lever, in the forward position. As the lever is moved up and down, air is forced into the air tank, causing the valve to close. Once the valve is closed, air is released from the remaining air tank, and the cartridge pops outwards, making a vacuum cleaner-like extraction of the grease from the bearing.
If you have a normal or gravity fed grease gun, you will need to place the priming cone in the back of the air bleeder valve. The priming cone will need to be inserted into the open end of the aluminum barrel, which will have one or two priming holes. The priming holes allow you to get a constant stream of air through the aluminum barrel to prime the bearing.
Next, you will want to turn the valve on to the “full” position. This will make the valve fully closed, trapping air in the valve and resulting in a vacuum seal around the aluminum barrel. Because the priming mechanism in a pressure washer is critical to proper operation, you will want to ensure that the priming holes are aligned with these holes. This will help maintain a consistent pressure for a long amount of time between feeding or drawing cycles.
Next, you will need to check your bore to see whether or not there is a sufficient amount of air in the aperture. If there is not enough air, it will prevent the trigger mechanism from closing, which will result in excessive grease being expelled from the gun. If the aperture is too small, excessive grease can be propelled back into the gun and the tube thus results in jamming and damaging the pump and/or nozzle. It is important to note that if the bore size is too small, the trigger mechanism will not work properly, resulting in poor feeding and shooting performance, or malfunctioning.
After verifying the above conditions have been met, you can then measure and adjust the suction tube port opening. For optimum performance, the port opening should be set to an aperture size that is at least one quarter of an inch larger than the diameter of the bore in the barrel. Once this is done, you will be ready to enjoy your greased barrel shooting action. Just be sure to follow these general safety procedures to ensure that your gun does not end up in the hands of a curious child. With the right tools, equipment, and precautions, your next target shooting session can be as close to the perfect outing as you can get.