Rubicon Lockers Not Engaging - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ Tech Forum

Join Wrangler Forum Today


Like Tree4Likes
  • 2 Post By jkp
  • 1 Post By Jerry Bransford
  • 1 Post By JackMacd
Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 08-11-2019, 12:30 AM
Thread Starter
  #1
Jeeper
 
JackMacd's Avatar
 
Join Date: Oct 2018
Location: California
Posts: 26
Rubicon Lockers Not Engaging

I know there have been a lot of threads on this. I am hoping to get some advice from someone who has more knowledge than I do.

I have a 2005 Wrangler Rubicon Unlimited. Since I have had it the lockers have never locked. The lights have always blinked. Today I did more investigating. Both air compressors are working and I have air to the differentials. When I push the locker button the rear light blinks and it doesnít lock. If I push it a second time the front locker locks but the lights (both) keeps blinking.

I have read that if the rear locker doesnít lock the front will not lock. Anyone has experience with this?

JackMacd is offline   Quote
Old 08-11-2019, 12:37 AM   #2
Jeeper
 
Join Date: Sep 2018
Posts: 37
Nope. The front should lock even if the rear does not.

Are you positive the both pumps work? Sometimes it may feel like they are pumping air but are not able to provide the full pressure to actuate the locker.

Can you physical talk by driving if the lockers are engaged?

If the pumps are working and pushing air the axles than the lockers would lock even if the lights didnít work. You should be able to tell in 4 low on a dirt road when the lockers are engage. If they are engaged and the lights keep blinking than you probably just have an issue with the sensor in side the axle. ( itís just a plunger thatís pushed when the locker engages.)

The only other possible issue is that the bladder in the differential it self is bad on both axles. I kind of doubt this but hey it could happen I guess.



Sent from my iPhone using Tapatalk

EmbarkWithMark is offline   Quote
Old 08-11-2019, 12:56 AM
Thread Starter
  #3
Jeeper
 
JackMacd's Avatar
 
Join Date: Oct 2018
Location: California
Posts: 26
I am not sure how to check if there is sufficient air pressure. I know both front and rear are getting air.

I put the Jeep on 4 jack stands. The front locker locked and the rear didn’t. Both lights were blinking. I think the bladder in the rear is bad so the rear is not engaging. I think the front is engaged but because the rear is not engaged the lights blink.

Anyone have experience?
JackMacd is offline   Quote
Sponsored Links
Advertisement
 
Old 08-11-2019, 09:07 AM   #4
Jeeper
 
tzukows's Avatar
 
Join Date: Feb 2018
Posts: 844
Could be the rear sensor, as EmbarkWithMark mentions. Replacing that is a little more involved. Check connections. Clean the terminals and the socket. Try that first and see what happens.

If no luck after cleaning contacts on the sensor... Could be simply gummed up from lack of use.

I would pop the cover, drain the rear diff fluid, clean it all out real good with cleaner spray and inspect.

Maybe a good cleaning is all that is needed to free up sticky parts. Cheap enough to do this and would not hurt anything.

I have an 05 Rubi. When I first got it, the lockers were not working. After a couple of tries, they finally "woke up". I think they had never even been activated and were just kind of stuck. Now I got them all working, I exercise them every so often on a gravel parking lot if I can't get to a trail (which due to work schedule is hardly at all, but I have to continue to be gainfully employed until I am old enough to retire...). With regular exercise, they seem to be working perfectly. Indicators and all.
__________________
/l ,[____],
l---L -OlllllllO-
()_)-()_)-o-)_)
****************
05 TJ Rubicon
tzukows is offline   Quote
Old 08-11-2019, 05:53 PM   #5
Jeeper
 
Join Date: Apr 2013
Posts: 13,004
With stock wiring they can only be locked in 4low at low speed and the linear pot the rubi case uses to sense transfer case position can be pretty problematic much more so then the simple switch used in the 231 case used in all other TJ


Sent from my iPhone using Tapatalk
Digger84 is offline   Quote
Old 08-12-2019, 12:10 AM   #6
Knows a couple things...

WF Supporting Member
 
Jerry Bransford's Avatar
 
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 48,444
Understand that the lockers will not lock unless the transfer case is in 4Low or when you're sitting still and they'll rarely lock when driving straight ahead. Try doing an S-turn or two while you're in 4Low which is what they need to lock.
__________________
When you have a choice, buy American.
Jerry Bransford is online now   Quote
Old 08-12-2019, 01:25 AM
Thread Starter
  #7
Jeeper
 
JackMacd's Avatar
 
Join Date: Oct 2018
Location: California
Posts: 26
Thank you for the input. I did do the S turn and still got the blinking llight.

I put the Jeep back on 4 jack stands and I hooked the rear hose on the front compressor. The rear didn’t lock. I then put the front hose on the rear compressor and the front locked.

This eliminates the air compressor issue. I think it is the locker itself. Has anyone replaced the locker? I see them for sale for about $150.
JackMacd is offline   Quote
Old 08-12-2019, 02:50 AM   #8
Knows a couple things...

WF Supporting Member
 
Jerry Bransford's Avatar
 
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 48,444
Do the compressors for the lockers shut off and stay off a second or two after engaging the lockers? Or do the compressors stay on after engaging either/both lockers?
__________________
When you have a choice, buy American.
Jerry Bransford is online now   Quote
Old 08-12-2019, 04:17 PM
Thread Starter
  #9
Jeeper
 
JackMacd's Avatar
 
Join Date: Oct 2018
Location: California
Posts: 26
Both compressors turn on and then turn off. When I pulled the air hose off the compressor they turn on and continue to run until i hook the hose back up.
JackMacd is offline   Quote
Old 08-12-2019, 06:16 PM   #10
Knows a couple things...

WF Supporting Member
 
Jerry Bransford's Avatar
 
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 48,444
Quote:
Originally Posted by JackMacd View Post
Both compressors turn on and then turn off. When I pulled the air hose off the compressor they turn on and continue to run until i hook the hose back up.
Then the air bladder inside the locker actuator is ok and not leaking.
__________________
When you have a choice, buy American.
Jerry Bransford is online now   Quote
Old 08-12-2019, 09:58 PM
Thread Starter
  #11
Jeeper
 
JackMacd's Avatar
 
Join Date: Oct 2018
Location: California
Posts: 26
Is it possible the compressor is not creating enough PSI? I know it only needs 5PSI so I doing think this is the problem.
JackMacd is offline   Quote
Old 08-14-2019, 02:36 PM   #12
Jeeper
 
Offroad1's Avatar
 
Join Date: Sep 2011
Posts: 520
Do some simple trouble shooting. From the pump, disconnect the airlines going to the rears. Starting with the front, jack it up, put it in 4 low (assuming it's stock). Turn on the key (shouldn't need to be running, just in the "On" position), then have someone blow into the front line while you spin the tire. If it locks up, you know the problem is either the pump or something electrical. If it doesn't, then the problem is somewhere in the differential. These pumps only require 5 PSI, so this works and is the safest way to make sure you don't blow the bladder. Once you do the front, repeat for the rear.


Note: Don't be afraid to blow into the line hard to make this test work. You're not going to break the bladder by blowing into it.
__________________
My '04 LJ Build

Owning a Jeep is a sickness, but one I'll gladly endure!
Offroad1 is offline   Quote
Old 08-18-2019, 12:05 AM
Thread Starter
  #13
Jeeper
 
JackMacd's Avatar
 
Join Date: Oct 2018
Location: California
Posts: 26
I am going to open up the diff this week and take a look. I don’t have the money to put on ARB or another after market locker system so if I do need to replace the stock locker is this it?

https://www.quadratec.com/p/crown-au...SABEgJJJfD_BwE

I am not familiar with what it looks like. I also read that if the drain plug is screwed on too tight it can cause the locker to not engage? Anyone has experience with that? I am going to try it this week.
JackMacd is offline   Quote
Old 08-18-2019, 10:56 AM   #14
Jeeper
 
Offroad1's Avatar
 
Join Date: Sep 2011
Posts: 520
That's the bladder/actuator. You have to remove the carrier to install it. Did you confirm the bladder is bad?
__________________
My '04 LJ Build

Owning a Jeep is a sickness, but one I'll gladly endure!
Offroad1 is offline   Quote
Old 08-18-2019, 11:04 AM   #15
jkp
Jeeper
 
Join Date: Mar 2010
Location: Warner Robins, GA
Posts: 1,022
The fill plug on the rear cover can jam the locker.

The drain plug is on the bottom of the diff.
Jerry Bransford and tzukows like this.
__________________
'92 Islander
'06 Rubicon
jkp is offline   Quote
Old 08-18-2019, 07:23 PM   #16
Jeeper
 
Join Date: Apr 2013
Posts: 13,004
Might try backing the fill plug back a turn or two


Sent from my iPhone using Tapatalk
Digger84 is offline   Quote
Old 08-18-2019, 08:26 PM   #17
Knows a couple things...

WF Supporting Member
 
Jerry Bransford's Avatar
 
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 48,444
Quote:
Originally Posted by JackMacd View Post
I am going to open up the diff this week and take a look. I don’t have the money to put on ARB or another after market locker system so if I do need to replace the stock locker is this it?

https://www.quadratec.com/p/crown-au...SABEgJJJfD_BwE

I am not familiar with what it looks like. I also read that if the drain plug is screwed on too tight it can cause the locker to not engage? Anyone has experience with that? I am going to try it this week.
If that part is actually bad, you can get it from www.rockauto.com for $80 where I have purchased two of them . Quadratec pricing is usually way too high. Look for Dana 84307 or the longer Spicer p/n shown in my screenshot.

Be advised it is very (!) tricky getting the carrier reinstalled which requires a special technique to avoid jamming the locker sensor hidden behind the carrier. If you get that far contact me and I'll give you some help on it. Only techs who have worked on Rubicon lockers know how to do it.
Attached Thumbnails
Click image for larger version

Name:	Screenshot_2019-08-18-17-25-14.jpg
Views:	11
Size:	132.8 KB
ID:	4170229  
tzukows likes this.
__________________
When you have a choice, buy American.
Jerry Bransford is online now   Quote
Old 08-19-2019, 01:33 PM   #18
Jeeper
 
tzukows's Avatar
 
Join Date: Feb 2018
Posts: 844
Quote:
Originally Posted by Jerry Bransford View Post
If that part is actually bad, you can get it from www.rockauto.com for $80 where I have purchased two of them . Quadratec pricing is usually way too high. Look for Dana 84307 or the longer Spicer p/n shown in my screenshot.

Be advised it is very (!) tricky getting the carrier reinstalled which requires a special technique to avoid jamming the locker sensor hidden behind the carrier. If you get that far contact me and I'll give you some help on it. Only techs who have worked on Rubicon lockers know how to do it.
Notes like these are very helpful for people with the same issue in the future. Thanks for documenting the replacement part information. Especially when the cost (at least from current available sources) is still reasonable!
__________________
/l ,[____],
l---L -OlllllllO-
()_)-()_)-o-)_)
****************
05 TJ Rubicon
tzukows is offline   Quote
Old 08-20-2019, 11:37 PM
Thread Starter
  #19
Jeeper
 
JackMacd's Avatar
 
Join Date: Oct 2018
Location: California
Posts: 26
Yes I understand. I have seen your posts about using a toothpick and a string to pull it out. I am going to check it out this weekend.
Thank you for all your help.
Jerry Bransford likes this.
JackMacd is offline   Quote
Old 08-21-2019, 11:27 PM
Thread Starter
  #20
Jeeper
 
JackMacd's Avatar
 
Join Date: Oct 2018
Location: California
Posts: 26
Alright I jacked up one side of the jeep. I pulled off the rear diff cover and this is what I found. The air bladder/Actuator is activating but the locker is still not locking.

See link for videos.

https://www.dropbox.com/sh/j2ij0mqb0...eThw0wxEa?dl=0

My two guesses are 1) air badder is not filling up all the way and not engaging the locker or 2) something is wrong with the actual locker.

I don't think it is the pump because I switched the front to the back and still had the same issues. The front diff locks with either pump.

I thought the air hose inside the diff might be cracked that is why there is a long temp hose in the video.

I might pull the front diff cover off just to compare.

Let me know what you think.
Thank you,
JackMacd is offline   Quote
Old 08-22-2019, 01:06 AM   #21
Knows a couple things...

WF Supporting Member
 
Jerry Bransford's Avatar
 
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 48,444
Don't forget you have to rotate one of the tires before the locker can engage.
__________________
When you have a choice, buy American.
Jerry Bransford is online now   Quote
Old 08-22-2019, 02:07 AM
Thread Starter
  #22
Jeeper
 
JackMacd's Avatar
 
Join Date: Oct 2018
Location: California
Posts: 26
I did rotate the tires.

I will have to keep trying to figure it out.
JackMacd is offline   Quote
Old 08-22-2019, 02:14 AM   #23
Knows a couple things...

WF Supporting Member
 
Jerry Bransford's Avatar
 
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 48,444
Quote:
Originally Posted by JackMacd View Post
I did rotate the tires.

I will have to keep trying to figure it out.
One side, not both.
__________________
When you have a choice, buy American.
Jerry Bransford is online now   Quote
Old 08-22-2019, 09:18 AM
Thread Starter
  #24
Jeeper
 
JackMacd's Avatar
 
Join Date: Oct 2018
Location: California
Posts: 26
Correct. In the video I have the passenger side tires (both front and back) off the ground.

JackMacd is offline   Quote
Reply

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off






All times are GMT -5. The time now is 05:42 AM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.1
User Alert System provided by Advanced User Tagging v3.1.0 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.

Jeepģ, Wrangler, Liberty, Wagoneer, Cherokee, Gladiator, Mopar and Grand Cherokee are copyrighted and trademarked to FCA US LLC.
Wranglerforum.com is not in any way associated with FCA US LLC.