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Vacuum diagram 4x4 locking hubs 2004 f 150 4x4

4x4 front locking hubs vacuum diagram

Posted by Anonymous on

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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SOURCE: 1998 ford ranger 4x4 Front Axle hubs will not engage

I found a website that explaned that you can remove the hub and dust cover, inside is a spring which holds the hub out, removing this spring and replacing the rubber dust cover and hub will lock your front hubs in continious. as is done on later models, This has worked for my 98 4wd

Posted on Dec 18, 2008

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SOURCE: 1986 K5 Blazer front hub/axle problem

3 bolts from the back, axle nut and take the caliper off pretty easy.

Posted on Jan 21, 2009

map6260
  • 9 Answers

SOURCE: banging noise in 4 wheel drive under torque. front hub questions.

Hello scotch1812, those of us that still enjoy the square headlights have to stick together! The front axle in our YJ's are dana 30 with a high pinion! The high pinion make the ring and pinion spin in a reverse rotation from the dana 30 found in CJ and TJ Jeeps. When Chrysler designed the YJ front axle, they removed the manual hubs like those found in CJ models and installed a vacuum disconnect on the passenger side axle shaft. The passenger side axle shaft is 2 piece with a sleeve that is moved into place to connect the 2 pieces of axle shaft when you shift the transfer case into 4 wheel drive. This is done via a vacuum module mounted on the axle housing. If your module diaphram goes bad you have no 4WD! If your vacuum hose comes off of the module or breaks you have no 4WD. Now when your transfer case is in 2WD the front driveshaft does not turn. The vacuum disconnect allows this to happen. As for the hubs, they are simply hubs with sealed bearings and a universal joint to allow your front wheels to turn left and right. If you hear the banging noise in 2WD it could be a bad universal joint in one of your axle shafts.

Now if you are hearing the banging noise only when you are in 4WD there could be a number of reasons. You could have a broken axle shaft or a bad bearing in your ring and pinion. Your front driveshaft could be bent or at least not straight. I would start with the driveshaft. Just lay under the Jeep (Not running! With emergency brake set!) and spin the front driveshaft. If it spins true and doesn't have an out of round rotation we can rule that out! Also, grab it and push it and pull it to check to see if your universal joints in the drive shaft are gor and tight! They can make a grinding noise or popping noise if they are bad!

Try these and let me know what you find! We will find your problem!

map6260

Posted on Mar 13, 2009

dcgun007
  • 63 Answers

SOURCE: 98 Ford F150 4x4 wont engage

I copied something that you might use because it was handy I know its not going to be exactly for you but it might get you fixed. Let me know if it helps or NOT please. gl dc

Posted on Jun 22, 2009

  • 20 Answers

SOURCE: front hubs dont lock when put in 4x4

Probably a vacuum leak. Tranny has to be in Neutral to shift into 4 low, but should be able to shift into 4 high in any gear. The auto locking hubs work off of a vacuum, if there's a leak in the line, they won't engage. If the 4x4 light is on, but the wheels aren't pulling, that's most likely the problem.

Posted on Aug 29, 2009

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1 Answer

Does a 2006 ford expedtion need a vaccum on front hubs to make engage and disengage


The vacuum is to keep the 4x4 disengaged, once vac is removed the IWE ( Integrated wheel end ) is engaged, so the front hubs are locked.

Block diagram from the F150, EXPY should be the same routing ( could be slightly different )
sscullys_166.jpg

The f150 had a TSB for the IWE solenoid where water could get into the system, and cause the IWE to not be disengaged in 2WD ( slightly engaged, ratcheting the IWE gear ).
Right Click, Save As
http://my.voyager.net/~sscully/file_tsb06_08_15.pdf

Jun 16, 2011 | 2006 Ford F-150

1 Answer

I have a 2006 Ford F-150 5.4 litre the 4x4 will not engage. I can **** into 4x4 and I can't turn the front shaft, in two wheel I can spin the shaft and I can see both sides of the axles turning up to the...


The hubs on this vehicle are vacuum operated and controlled by a module and a solenoid valve. When there is no vacuum applied to the hubs they should be locked in. The hubs will unlock with vacuum applied. Disconnect the vacuum lines at the hubs and see if the axles freewheel. If they do you likely have a hub issue. If the hubs are locked in with the lines disconnected you probably have a faulty solenoid valve.

Aug 08, 2010 | 2006 Ford F-150

2 Answers

95 kia sportage transfer case engages, but hubs do nnot lock. my light for 4X4 lights up,


the vacuum hoses or wheel seals are leaking in the front wheels. they are vacuum operated. the dealer has kits you can buy to convert to manuel locking hubs, they had alot of problems with the vacuum hubs

Apr 02, 2010 | 1995 Kia Sportage

1 Answer

4x4 lights come on but it does not go in what could it be


There are issues with the 4x4 system I.w.e ends ingesting moisture/water into vacuum actuation system causing no 4x4 or ratcheting outboard I.w.e ends. (Even if you don't go 4x4'n ) pull off vacuum hoses @ I.w.e ends and check for moisture/water/rust also the I.w.e is not part of the wheel bearing itself It is the part on the axle side (inboard) of the spindle. (EVEN DEALERS CAT LISTED WRONG )Many shops just replace the wheel bearing side this may fix the symptom but not the true cause of damaged I.w.e. ! Check with a reputable dealer they should have info on this condition and repair procedure.
The integrated wheel end (IWE) system contains the following:
Vacuum reservoir
IWE solenoid
IWEs (spring loaded vacuum hubs)
Vacuum hoses
Check valve
The IWE system uses vacuum hubs that engage the front wheel hubs to the front halfshafts or disengage the front wheel hubs from the front halfshafts

The IWE solenoid receives engine vacuum from the vacuum reservoir.
When the 4-wheel drive system is in 2WD mode, the 4x4 module (PCM) supplies a ground path to the IWE solenoid to apply vacuum to the integrated wheel ends (disengaging the front hubs from the front halfshafts). In 4WD mode, the 4x4 module (PCM) does not supply the ground path to the IWE solenoid, vacuum is not applied to the integrated wheel ends and an internal spring keeps the front hubs engaged to the front halfshafts.

Feb 02, 2010 | 1998 Ford Expedition

1 Answer

My 97 ford f150 4 wheel drive whont lock in to 4high fuses are good but no fire 2 dash swich can any one help?


There are issues with the 4x4 system I.w.e ends ingesting moisture/water into vacuum actuation system causing no 4x4 or ratcheting outboard I.w.e ends. (Even if you don't go 4x4'n ) pull off vacuum hoses @ I.w.e ends and check for moisture/water/rust also the I.w.e is not part of the wheel bearing itself It is the part on the axle side (inboard) of the spindle. (EVEN DEALERS CAT LISTED WRONG)Many shops just replace the wheel bearing side this may fix the symptom but not the true cause of damaged I.w.e. ! Check with a reputable dealer they should have info on this condition and repair procedure.


The integrated wheel end (IWE) system contains the following:

Vacuum reservoir
IWE solenoid
IWEs (spring loaded vacuum hubs)
Vacuum hoses
Check valve
The IWE system uses vacuum hubs that engage the front wheel hubs to the front half shafts or disengage the front wheel hubs from the front half shafts.

The IWE solenoid receives engine vacuum from the vacuum reservoir.

When the 4-wheel drive system is in 2WD mode, the 4x4 module (PCM)supplies a ground path to the IWE solenoid to apply vacuum to the integrated wheel ends (disengaging the front hubs from the front half-shafts). In 4WD mode, the 4x4 module (PCM) does not supply the ground path to the IWE solenoid, vacuum is not applied to the integrated wheel ends and an internal spring keeps the front hubs engaged to the front half-shafts.

Good luck and check the vacuum line, start with the simple. Keep me posted, be glad to get your 4wd working again.

Jan 26, 2010 | 1997 Ford F150 Regular Cab

1 Answer

I have a 2004 f150 when i put it into 4x4 it has a ratcheting noise is it my hub


There are issues with the 4x4 system I.w.e ends ingesting moisture/water into vacuum actuation system causing no 4x4 or ratcheting outboard I.w.e ends. (Even if you don't go 4x4'n ) pull off vacuum hoses @ I.w.e ends and check for moisture/water/rust also the I.w.e is not part of the wheel bearing itself It is the part on the axle side (inboard) of the spindle. (EVEN DEALERS CAT LISTED WRONG)Many shops just replace the wheel bearing side this may fix the symptom but not the true cause of damaged I.w.e. ! Check with a reputable dealer they should have info on this condition and repair procedure.


The integrated wheel end (IWE) system contains the following:

Vacuum reservoir
IWE solenoid
IWEs (spring loaded vacuum hubs)
Vacuum hoses
Check valve
The IWE system uses vacuum hubs that engage the front wheel hubs to the front half shafts or disengage the front wheel hubs from the front half shafts.

The IWE solenoid receives engine vacuum from the vacuum reservoir.

When the 4-wheel drive system is in 2WD mode, the 4x4 module (PCM)supplies a ground path to the IWE solenoid to apply vacuum to the integrated wheel ends (disengaging the front hubs from the front half-shafts). In 4WD mode, the 4x4 module (PCM) does not supply the ground path to the IWE solenoid, vacuum is not applied to the integrated wheel ends and an internal spring keeps the front hubs engaged to the front half-shafts.

Good luck and check the vacuum line, start with the simple. Keep me posted, be glad to get your 4wd working again and rate please.

Jan 12, 2010 | 2004 Ford F150

1 Answer

Front hubs dont lock when put in 4x4


Probably a vacuum leak. Tranny has to be in Neutral to shift into 4 low, but should be able to shift into 4 high in any gear. The auto locking hubs work off of a vacuum, if there's a leak in the line, they won't engage. If the 4x4 light is on, but the wheels aren't pulling, that's most likely the problem.

Aug 14, 2009 | 2003 Ford F150 Regular Cab

2 Answers

When I shift to 4 wheel drive the indicator light comes on but the front wheels do not lock. If you manually lock the front hubs the 4 wheels lock and work fine. what is the fix for this problem.


The autolocking hubs are vacuum actuated. If they don't lock then you most likely have a vacuum leak somewhere. This usually occurs where the vacuum line (black rubber hose) attaches to the knuckle on the inside of each front wheel. These hoses get dry and crack. Another simptom of this leak is the AC changing from front vents to defrost vents when you switch to 4x4 so check for this. You could also have a vacuum leak in the hub diaphragm or one of the orings in the hub could be cracked or broken. If you cannot find a vacuum leak then the vacuum solonoid valve may be bad.

Aug 07, 2009 | 2003 Ford F250 Super Duty Crew Cab

1 Answer

1998 ford ranger 4x4 Front Axle hubs will not engage


I found a website that explaned that you can remove the hub and dust cover, inside is a spring which holds the hub out, removing this spring and replacing the rubber dust cover and hub will lock your front hubs in continious. as is done on later models, This has worked for my 98 4wd

Dec 16, 2008 | 1998 Ford Ranger SuperCab

1 Answer

4x4 not locking in


check the vacuum lines going to the hubs and make sure the hubs are locked in

Aug 28, 2008 | 2000 Ford Excursion

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