ESOF
Thread Starter
|
Senior User
Joined: Oct 2007
Posts: 359
Likes: 0
From: Oklahoma
ESOF
Just read a post regarding the locking hubs and it reminded me that my ESOF doesn't seem to be working. Each time I need 4 wheel drive, I have to get out and lock the hubs in order to get things going again. Any ideas?
Elder User
Joined: Aug 2003
Posts: 519
Likes: 0
From: New York
If everything works properly after engaging the hubs, you may have a faulty vacume line. That is why many people including myself plug off these lines and install the warn hubs. However, to fix your problem you must start with the obvious simple things, fuses, weathered vacume lines pinches in the line etc. Follow the lines up from the hubs to the right side of the truck I believe there is a T connection that is visible from above, check to see if you have vacume there, if you do, proceed to each seperate line going to the hubs. Just dont overlook the little things. Good Luck.
Cargo Master
Joined: Jan 2008
Posts: 2,566
Likes: 18
From: The Great White North!
Quick way to tell if it is vacuum related is to check the defrost. The system defaults to windshield defrost if there is a vacuum problem. Dial in to vents and then try to engage esof and check if system defaults. If not, then you have a hub problem, but it is usually the vacuum line attached to the hub, they are known to break there.
Post Fiend
Joined: Mar 2009
Posts: 11,798
Likes: 14
From: Mt. Shasta California
I would start by taking the hubs all apart , cleaning, lightly greasing, and check your seals while you are at it. The hubs need to be serviced because you need a good working unit to start with. There are 3 seals on each side; the black o-ring at the outer hub, the yellow o-ring that surrounds the hub assembly where it fits into the knuckle, and the big lip seal that fits into the knuckle and rides on the stub axle. All 3 of those have to hold air and your esof might not work if they are not in good enough shape. Then check for vacuum. Do a search in here also.
Posting Guru
Joined: Nov 2005
Posts: 1,519
Likes: 1
From: Wyandotte, Michigan
Quick way to tell if it is vacuum related is to check the defrost. The system defaults to windshield defrost if there is a vacuum problem. Dial in to vents and then try to engage esof and check if system defaults. If not, then you have a hub problem, but it is usually the vacuum line attached to the hub, they are known to break there.
Posting Guru
Joined: Nov 2005
Posts: 1,519
Likes: 1
From: Wyandotte, Michigan
This is where mine are leaking due to the shaft being a bit rusty. Mechanic says only way to get them to seal is to replace the shafts which is very $$$.
Trending Topics
Post Fiend
Joined: Mar 2009
Posts: 11,798
Likes: 14
From: Mt. Shasta California
Not to mention that the seal is flexible and will conform to the shaft.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Top 10 Ford Trucks Coming to Mecum Indy 2026
Brett Foote
5 Best / 5 Worst Ford Truck Wheels of All Time
Joe Kucinski
Ford Super Duty: 5 Things Owners LOVE, 5 Things They LOATHE!
Joe Kucinski
Every 2026 Ford Truck Engine RANKED from WORST to FIRST!
Michael S. Palmer
The Best F-150 Deal of Every Trim Level (XL through Raptor)
Joe Kucinski
Post Fiend
Joined: Mar 2009
Posts: 11,798
Likes: 14
From: Mt. Shasta California
I think it has to be a full vacuum loss to default.
Posting Guru
Joined: Nov 2005
Posts: 1,519
Likes: 1
From: Wyandotte, Michigan
I don't buy that. The seal only covers about 1/8" of linear space on the shaft and there is not going to be any rust where it rides. Some people imagine things and voice them just to sound like they know something. Not to mention that the seal is flexible and will conform to the shaft.
Not to mention that the seal is flexible and will conform to the shaft.
Thread
Thread Starter
Forum
Replies
Last Post
