4x4 Vacuum Operated Front Hubs
#1
4x4 Vacuum Operated Front Hubs
I sure would appreciate someone posting an assembly scan of one of the front vacuum operated hubs on our '04 and '05 4x4's. Just curious as to how these things work and how reliable they are. I've had manual locking and mechanical auto locking (didn't particularly like the latter type) hubs on my other 4x4's.
Thanks,
Scott
Thanks,
Scott
#3
#5
Originally posted by Jamesdc1
One thing interesting about these hubs is that they are excercised plenty.
The vacuum from the engine "unlocks" them.
So you start your engine, they disconnect.
Stop your engine, they engauge.
-James-
One thing interesting about these hubs is that they are excercised plenty.
The vacuum from the engine "unlocks" them.
So you start your engine, they disconnect.
Stop your engine, they engauge.
-James-
#6
#7
TBird, you got the million dollar question wrong....
Zman... here is the "source for that info".
Normal Operation
The 4x4 module energizes the IWE solenoid which applies vacuum to the integrated wheel-ends disengaging the front hubs from the front axle and driveshaft. If the solenoid is not energized, an internal spring keeps the hubs engaged. Systematically check the necessary inputs and outputs at the 4x4 module, internal components of the transfer case and shift lever, IWE components, and drive axles.
Zman... here is the "source for that info".
Normal Operation
The 4x4 module energizes the IWE solenoid which applies vacuum to the integrated wheel-ends disengaging the front hubs from the front axle and driveshaft. If the solenoid is not energized, an internal spring keeps the hubs engaged. Systematically check the necessary inputs and outputs at the 4x4 module, internal components of the transfer case and shift lever, IWE components, and drive axles.
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#8
Originally posted by klassic
TBird, you got the million dollar question wrong....
Zman... here is the "source for that info".
Normal Operation
The 4x4 module energizes the IWE solenoid which applies vacuum to the integrated wheel-ends disengaging the front hubs from the front axle and driveshaft. If the solenoid is not energized, an internal spring keeps the hubs engaged. Systematically check the necessary inputs and outputs at the 4x4 module, internal components of the transfer case and shift lever, IWE components, and drive axles.
TBird, you got the million dollar question wrong....
Zman... here is the "source for that info".
Normal Operation
The 4x4 module energizes the IWE solenoid which applies vacuum to the integrated wheel-ends disengaging the front hubs from the front axle and driveshaft. If the solenoid is not energized, an internal spring keeps the hubs engaged. Systematically check the necessary inputs and outputs at the 4x4 module, internal components of the transfer case and shift lever, IWE components, and drive axles.
#9
#10
You can test this out pretty easily also. If you ever have the front of the truck off the ground or on a lift, try to spin the front wheels with the truck off. They will be locked to the driveshafts, with truck running they will not (unless in 4WD of course). This also makes me realize something else.....There is no way for someone to tow a 4x4 F150 by just lifting the rear wheels, it would have to be flatbedded.
EDIT: And if you are in 2WD and if the vacuum line were to break or solenoid to F up, the hubs would lock up.......BUT the transfer case will not be engaged so the front wheels won't be locked to the rear.
EDIT: And if you are in 2WD and if the vacuum line were to break or solenoid to F up, the hubs would lock up.......BUT the transfer case will not be engaged so the front wheels won't be locked to the rear.
Last edited by Matt 05'FX4; 02-12-2006 at 12:10 AM.
#11
I believe that the clutch in the transfer case is unlocked then the truck is parked. So you should be able to tow it, although the drive shaft would turn.
Originally Posted by Matt 05'FX4
You can test this out pretty easily also. If you ever have the front of the truck off the ground or on a lift, try to spin the front wheels with the truck off. They will be locked to the driveshafts, with truck running they will not (unless in 4WD of course). This also makes me realize something else.....There is no way for someone to tow a 4x4 F150 by just lifting the rear wheels, it would have to be flatbedded.
EDIT: And if you are in 2WD and if the vacuum line were to break or solenoid to F up, the hubs would lock up.......BUT the transfer case will not be engaged so the front wheels won't be locked to the rear.
EDIT: And if you are in 2WD and if the vacuum line were to break or solenoid to F up, the hubs would lock up.......BUT the transfer case will not be engaged so the front wheels won't be locked to the rear.
#13