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Unread 06-30-2013, 10:48 AM   #1
chevellian
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Greasing Johnny Joint?

Hello Jeep forum advice guys,

Had the Lower arms off my Jeep to do some mount work. While I had them off I thought it would be a good time to grease them. I have had these joints for a little over a year, they have seen numerous wheeling trips and around 6k road miles.

Cleaned the outside up a bit and stuck the joint in a vice. The joint was very tight, I had to really crank down the vice so that I could move the joint around. Next I tried to grease the joint, it didn't want to take any grease. I moved the joint around to different positions, still no go. Finally I just slowly kept pressure on the grease gun and I got some grease in there. I also took notice that no grease flowed out of the joint.

Problem now is the joint is much stiffer than before, I can't budge it. I removed the grease zerk and the grease I just put in came flowing back out. The joint now was moveable again. I believe I hydro locked it.

I tried greasing 4 more joints, I could not get any grease in them, and no grease flowed out. I am starting to think that the Johnny Joint is not really a greasable joint.

Finally, my question is: Am I better off just letting the Johnny Joints go and not try to grease them. Every other thing I grease will let the old grease flow out.

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Unread 06-30-2013, 12:00 PM   #2
tjcj
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Just let them go without grease. Mine are over a year old and still won't take any. If you want to grease them you have to disassembly the joint.

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Unread 06-30-2013, 12:07 PM   #3
mrblaine
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Quote:
Originally Posted by chevellian View Post
Hello Jeep forum advice guys,

Had the Lower arms off my Jeep to do some mount work. While I had them off I thought it would be a good time to grease them. I have had these joints for a little over a year, they have seen numerous wheeling trips and around 6k road miles.

Cleaned the outside up a bit and stuck the joint in a vice. The joint was very tight, I had to really crank down the vice so that I could move the joint around. Next I tried to grease the joint, it didn't want to take any grease. I moved the joint around to different positions, still no go. Finally I just slowly kept pressure on the grease gun and I got some grease in there. I also took notice that no grease flowed out of the joint.

Problem now is the joint is much stiffer than before, I can't budge it. I removed the grease zerk and the grease I just put in came flowing back out. The joint now was moveable again. I believe I hydro locked it.

I tried greasing 4 more joints, I could not get any grease in them, and no grease flowed out. I am starting to think that the Johnny Joint is not really a greasable joint.

Finally, my question is: Am I better off just letting the Johnny Joints go and not try to grease them. Every other thing I grease will let the old grease flow out.
The good time to grease them was long before now. You have the grease path to the ball blocked by dried out grease and the new stuff you are putting in is going between the race and the inside of the barrel. You should consider taking them apart, cleaning the dried up stuff out and putting them back together with a high moly content CV style lube.
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Unread 06-30-2013, 12:08 PM   #4
sjones26573
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You shouldn' force grease in them. You can destroy them that way. If they won't take grease, they don't need it. And my joints aren't stiff at all. I can move them pretty easily. Rokmen arms.
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Unread 06-30-2013, 03:15 PM   #5
chevellian
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Quote:
Originally Posted by tjcj View Post
Just let them go without grease. Mine are over a year old and still won't take any. If you want to grease them you have to disassembly the joint.

Sent from my XT881 using JeepForum
Sounds like you have the same experience with them as myself.

Quote:
Originally Posted by mrblaine View Post
The good time to grease them was long before now. You have the grease path to the ball blocked by dried out grease and the new stuff you are putting in is going between the race and the inside of the barrel. You should consider taking them apart, cleaning the dried up stuff out and putting them back together with a high moly content CV style lube.
I have tried to grease them while on the vehicle every oil change, and they didn't take any grease then either. I thought since I had the arms off I could be a bit more thorough. I guess I will pull them apart, clean them up and grease them.

I have been using this grease: DuraBlend® Synthetic Blend Grease Is it fine, or do you recommend something else?

Quote:
Originally Posted by sjones26573 View Post
You shouldn' force grease in them. You can destroy them that way. If they won't take grease, they don't need it. And my joints aren't stiff at all. I can move them pretty easily. Rokmen arms.
Mine are pretty stiff, maybe when I clean and lube them they will be looser.

Thank you all for your responses. One more question though, were does the old grease usually escape from, or does the new grease just replace grease that has dried up? kinda confused because the seal around the ball seams very tight and is probably a good thing because it keeps the crap out of the joint. I definitely don't want to destroy my joints trying to grease them.
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Unread 07-05-2013, 10:04 PM   #6
chevellian
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I dissembled, cleaned and greased all 16 joints. What a job!

Learned a couple things though:
1) the bolts with the grease zerks do not grease the joints. (except the ones on the front axle)
2) they must be able to run dry, my joints had no grease in them at all but they all had little to no wear.
3) greasing them loosens them up considerably.
4) you need a good set of snap ring pliers.
5) I don't want to do this again.

Still have to do the johnny joints on the trac bars, but I needed a little break.
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Unread 07-06-2013, 10:24 PM   #7
Gary2
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when I ran JJ's I drilled a small hole in any of the centers that didn't already have a hole so greasing the bolt also added grease inside the JJ .
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