4 Wheel Drive Won't Work - Ford F150 Forum - Community of Ford Truck Fans



4 Wheel Drive Won't Work

Reply
 
 
 
Thread Tools Search this Thread
Old 11-08-2009, 08:23 AM   #1
Junior Member
Thread Starter
 
Join Date: Sep 2009
Location: Knoxville, TN
Posts: 6
Thanks: 0
Thanked 0 Times in 0 Posts
Default 4 Wheel Drive Won't Work

I have a 1998 F150, 4x4 Lariat 136,000 miles. The 4 wheel drive, front wheels won't engage. It has the switch on the dash, not manual hubs. The shaft off the transimission engages went I flip between 2 and 4.

The vaccum lines go to a round black unit, middle front of the front axle. Does this push/pull the axles to hubs, or what does it do? I haven't found any lines/wires to the hubs other than the anti-lock brakes. It also has a vent hose that goes up in the motor compartment.

I guess this is an education session. Where should I start?
drwillis is offline   Reply With Quote
Old 11-09-2009, 11:13 AM   #2
Senior Member
5 Year Member
 
my2003Fx4's Avatar
 
Join Date: Mar 2009
Location: Roy, Utah
Posts: 402
Thanked 5 Times in 5 Posts
Default

If your truck is like mine, then that black box on the front of the axle is the 4wd acctuator. It controls a little arm inside the axle housing that slides a lock collar onto the axles to engage the front axles. You need to make sure the acctuator is working first. get someone to switch it from 2wd to 4wd and back and forth and look at the acctuator and you should see part of it moving.
my2003Fx4 is offline   Reply With Quote
The Following User Says Thank You to my2003Fx4 For This Useful Post:
cjc (02-03-2013)
Old 11-09-2009, 12:10 PM   #3
Junior Member
 
Join Date: Oct 2008
Posts: 5
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Quote:
Originally Posted by drwillis View Post
I have a 1998 F150, 4x4 Lariat 136,000 miles. The 4 wheel drive, front wheels won't engage. It has the switch on the dash, not manual hubs. The shaft off the transimission engages went I flip between 2 and 4.

The vaccum lines go to a round black unit, middle front of the front axle. Does this push/pull the axles to hubs, or what does it do? I haven't found any lines/wires to the hubs other than the anti-lock brakes. It also has a vent hose that goes up in the motor compartment.

I guess this is an education session. Where should I start?

Hilarious, I came on this forum this morning because my truck (97) is having exactly the same problem. I hear a small clunk from the transfer case like it is engaging when I turn the 4x4 switch but the wheels are not turning. I will check the actuator as mentioned above.

I also have heard that there is a little servo motor in the transfer case that tends to go, anyone know anything about that?

Any other suggestions would be appreciated by more than one forum member now

Are there any fuses that might be the problem? Thanks for the help, snowmobiling season is quickly approaching so I have got to get that 4 wheel drive working.

Last edited by powderhoundbrr; 11-09-2009 at 01:49 PM.
powderhoundbrr is offline   Reply With Quote
Old 11-10-2009, 07:25 AM   #4
Junior Member
Thread Starter
 
Join Date: Sep 2009
Location: Knoxville, TN
Posts: 6
Thanks: 0
Thanked 0 Times in 0 Posts
Default

OK, the 4wd acctuator is not moving, when the we switch between 2 & 4 wheel drive. What would be the best to check next, vaccum lines or remove the acctuator then see if the level will actually move?
drwillis is offline   Reply With Quote
Old 11-10-2009, 10:47 AM   #5
Senior Member
5 Year Member
 
my2003Fx4's Avatar
 
Join Date: Mar 2009
Location: Roy, Utah
Posts: 402
Thanked 5 Times in 5 Posts
Default

got a dumb question but the truck was running wasn't it lol i would check the vaccum lines next, just pull them off the acctuator (remember where which one goes) and get your buddy to do the same thing, you should be able to hear/feel the air coming in and out of the lines. If not, one of your lines might have a hole rubbed in it. The battery box in my truck rubbed a hole in one of mine one time

Last edited by my2003Fx4; 11-10-2009 at 10:50 AM.
my2003Fx4 is offline   Reply With Quote
Old 11-10-2009, 12:36 PM   #6
4dtuff
 
4dtuff's Avatar
 
Join Date: Sep 2009
Posts: 62
Thanks: 0
Thanked 1 Time in 1 Post
Default

Quote:
Originally Posted by my2003Fx4 View Post
got a dumb question but the truck was running wasn't it lol i would check the vaccum lines next, just pull them off the acctuator (remember where which one goes) and get your buddy to do the same thing, you should be able to hear/feel the air coming in and out of the lines. If not, one of your lines might have a hole rubbed in it. The battery box in my truck rubbed a hole in one of mine one time


Those vaccum lines are hard plastic and get brittle over time, so be careful not to bend them too much, they could be cracked anywhere so look close
4dtuff is offline   Reply With Quote
The Following User Says Thank You to 4dtuff For This Useful Post:
cjc (02-03-2013)
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Intro and part questions LostAndFound General F150 Discussion 27 11-06-2016 04:24 PM
Real bad Vibration / Shake in rear end fnbeertime 2004 - 2008 Ford F150 12 09-02-2016 03:10 PM
Had to get rid of my f150 nsejda 2004 - 2008 Ford F150 12 09-04-2015 07:58 PM
Outdoor Temp Display on Platinum waterboyjlw 2009 - 2014 Ford F150 5 09-04-2015 01:27 PM
Engine Rebuild Question smokeater52 Maintenance Shop 0 09-01-2015 11:41 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 -4. The time now is 12:25 PM.


Copyright 2006 - 2016 F150Forum.com