autolock hub not working
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Laughing Gas
Joined: Jul 2012
Posts: 889
Likes: 1
From: Ithaca
autolock hub not working
Well just replaced most everything in the front axle. Hubs, vacuum seal, dust seal, inner seals and calipers. I also cleaned the autolock hubs. Fist time I used them they worked. I tried again today and no 4wd. I checked the vacuum lines and they are all intact. Not sure what to do next.
Fleet Mechanic
Joined: Mar 2013
Posts: 1,576
Likes: 41
From: Wyoming
Suggest you "T" off one of vacuum lines to hub with a vacuum gauge.
That will tell you if hubs are still leaking or if they are getting vacuum.
Easiest way to tell if hub is leaking is to blow into vacuum line to hub. If you cannot blow thru it's good. If you can is bad.
The gauge will also tell you if vacuum solenoid is working right or not.
That will tell you if hubs are still leaking or if they are getting vacuum.
Easiest way to tell if hub is leaking is to blow into vacuum line to hub. If you cannot blow thru it's good. If you can is bad.
The gauge will also tell you if vacuum solenoid is working right or not.
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Super Moderator
Joined: May 2004
Posts: 29,380
Likes: 118
From: Central Coast of CA
If you have a 7.3L, turn your keys to the "on" position to power up your vacuum pump to fill the line. That will allow you to track down the leak.
Stewart
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Thread Starter
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Laughing Gas
Joined: Jul 2012
Posts: 889
Likes: 1
From: Ithaca
sorry its a 2005 6L EB with too many upgrades to list
Super Moderator
Joined: May 2004
Posts: 29,380
Likes: 118
From: Central Coast of CA
Not very up on my 6.0L knowledge, but it's still a diesel and it doesn't make vacuum so you have a pump. Turn the key to "On" and see if you can find the culprit after your pump turns off.
Stewart
Stewart
Posting Guru
Joined: Jul 2006
Posts: 1,181
Likes: 1
From: Fairfield, CA
Working Auto locking hubs on a Superduty / Excursion = Unicorn. Does anyone know if there's an aftermarket alternative Auto Locking Hubs. I don't mind getting out to lock my hubs but the wheel caps have to be removed to do so.
Posting Guru
Joined: Sep 2015
Posts: 1,320
Likes: 9
From: Central Florida
On my last ex there was a valve where the vac lines meet and go to the hubs. On a 7.3 its on the passenger side between the pump and the battery, high on the fender. Mine was bad, replaced it and they worked fine.
Its got two vac hoses and an electrical connector. Can't remember the name of it now, pretty cheap to replace too
Its got two vac hoses and an electrical connector. Can't remember the name of it now, pretty cheap to replace too
