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Repair Topics > Driveline and axles > Grease U joints

Grease U joints

Special tools to grease U joints

It’s important to grease U joints to extend their life especially if you

image of U joint with grease fitting in the cross

U joint with zerk grease fitting located in the cross

do off-roading. But many times the zerk fitting is located in the cross of the U joint, making it impossible to fit a traditional grease gun coupler on to the zerk. That’s where you need a special grease gun needle adapter.

Choose from different grease gun needle adapter styles

Grease gun needle adapters come in two basic styles: screw on and snap on. The screw on styles require you to remove the coupler from the end of your grease gun hose or tube so you can screw on the needle adapter. The snap on style has a zerk fitting on one end so it snaps right onto your couple.

The screw on style is more rigid and won’t leak grease, while the snap on style is prone to leaking grease at the coupler/zerk connection. It’s not as rigid as the screw on style but it’s a lot more convenient.

ProLube 44920, Lincoln 58000, Plews 05-025, Plews 05-037, Performance tool W54216, OTC 2332 grease gun needle adapaters and kits for greasing u joints

Grease gun needle adapters and kit

Choose grease gun needle adapter needle length

The most common needle adapters have a 4-in. needle, but some adapters are about 1-in. Choose a needle adapter that can reach into the U joint.

How to inject grease into a U joint

Simply press the needle into the zerk fitting so it displaces the ball bearing seal. Then pump in the grease. Some will seep out, don’t worry about it. Click on this video for more information.

©, 2017 Rick Muscoplat

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