Dumb question/auto locking hubs
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Postmaster
Joined: Aug 2015
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From: NW IA
Dumb question/auto locking hubs
Little confusion on my part with the auto locking hubs.
Leave them in auto all the time?
What is the point of locking them? Does this over ride the vacuum system if it fails?
System works fine when I flip the switch but after a wheel swap where the hubs were covered up, discovered they were in LOCK but it never turned hard on dry pavement........seems odd to me though.
Leave them in auto all the time?
What is the point of locking them? Does this over ride the vacuum system if it fails?
System works fine when I flip the switch but after a wheel swap where the hubs were covered up, discovered they were in LOCK but it never turned hard on dry pavement........seems odd to me though.
Post Fiend
Joined: Oct 2009
Posts: 12,123
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From: N. Fort Worth, tx
Mike the lock function is an override fail safe feature. Running full time with locked hubs in 4x2 can cause unnecessary wear and tear. It also can be a reason for reduced fuel economy.
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Postmaster
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From: NW IA
So even when they are locked the dash switch still engages the pump correct?
Doesn't seem fail safe if one still has to rely on the pump.
Having a serious case of cranial rectosis here, sorry for asking the obvious.
The reason I am confused is when we swapped wheels, I could have sworn the hubs were in lock both sides which I found odd, but they engage and disengage with the switch.
I also noticed the suckers turn hard, as in it took a channel lock to coax them at first, now I can turn them by hand.
Is there a way to lube that up?
Doesn't seem fail safe if one still has to rely on the pump.
Having a serious case of cranial rectosis here, sorry for asking the obvious.
The reason I am confused is when we swapped wheels, I could have sworn the hubs were in lock both sides which I found odd, but they engage and disengage with the switch.
I also noticed the suckers turn hard, as in it took a channel lock to coax them at first, now I can turn them by hand.
Is there a way to lube that up?
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Postmaster
Joined: Aug 2015
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From: NW IA
I did read some more in depth threads, just have a case of head up rear. When one fails to put a transfer case in the equation...........never mind 
It's Xmas, give me a break!
If I was a betting man I would dare bet I'll find that auto hubs don't work on the truck and that is why they were in lock when covered up by the center caps. That, or the PO left them in lock figuring they would quit working or was just too ignorant to put them in auto.
I'll find out tomorrow when we get the 5" of the white stuff that is in the forecast
It's Xmas, give me a break!
If I was a betting man I would dare bet I'll find that auto hubs don't work on the truck and that is why they were in lock when covered up by the center caps. That, or the PO left them in lock figuring they would quit working or was just too ignorant to put them in auto.
I'll find out tomorrow when we get the 5" of the white stuff that is in the forecast
Strokin Okie
Joined: Apr 2004
Posts: 1,883
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From: Oklahoma
I did read some more in depth threads, just have a case of head up rear. When one fails to put a transfer case in the equation...........never mind
It's Xmas, give me a break!
If I was a betting man I would dare bet I'll find that auto hubs don't work on the truck and that is why they were in lock when covered up by the center caps. That, or the PO left them in lock figuring they would quit working or was just too ignorant to put them in auto.
I'll find out tomorrow when we get the 5" of the white stuff that is in the forecast
It's Xmas, give me a break!
If I was a betting man I would dare bet I'll find that auto hubs don't work on the truck and that is why they were in lock when covered up by the center caps. That, or the PO left them in lock figuring they would quit working or was just too ignorant to put them in auto.
I'll find out tomorrow when we get the 5" of the white stuff that is in the forecast
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Postmaster
Joined: Aug 2015
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From: NW IA
Well with the winter storm warning going on and a lot of snow this morning proved a good time to try them. They work fine and engage/disengage right after I flip the switch, granted I always wait just a few seconds before giving it any pedal or let off the pedal and wait a bit if I am testing on a slippery patch to be sure they are off.
That said, when I was in the shop this morning to listen for the pump run time I noticed it takes a good 20 seconds for the pump to shut off.
This seem a little long? This was KOEO, flipping from4x2 to 4x4, and then back. I did this once, and waited about ten seconds betweeen the cycle after pump shut off.
I plan to take the hubs off today since it's not fit to go anywhere really, and re pack the hubs. I watched a few vids last night, looks pretty straight forward however I can't confirm if those vids are of the manual hubs only or the auto type, and what the major diff would be.
That said, when I was in the shop this morning to listen for the pump run time I noticed it takes a good 20 seconds for the pump to shut off.
This seem a little long? This was KOEO, flipping from4x2 to 4x4, and then back. I did this once, and waited about ten seconds betweeen the cycle after pump shut off.
I plan to take the hubs off today since it's not fit to go anywhere really, and re pack the hubs. I watched a few vids last night, looks pretty straight forward however I can't confirm if those vids are of the manual hubs only or the auto type, and what the major diff would be.
Post Fiend
Joined: Oct 2009
Posts: 12,123
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From: N. Fort Worth, tx
The trucks only came with vacuum auto type hubs, some people have gone to manual only conversions.
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Lead Driver
Joined: May 2014
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From: Virginia Beach VA
Pump is supposed to deliver a vacuum for a period of time to allow the movement and a little extra, like 30 seconds. The switch also activities the motor to move the transfer case into 4x4. Moving the switch back does the same thing but a shorter vacuum pulse to unlock the hub.
KOEO you should hear the pump and motor at the transfer case.. great start for trouble shooting bad vacuum or pump.
You need to be going 5mph or more, worse case, flip the switch and lock the hubs in.
KOEO you should hear the pump and motor at the transfer case.. great start for trouble shooting bad vacuum or pump.
You need to be going 5mph or more, worse case, flip the switch and lock the hubs in.
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Postmaster
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From: NW IA
Taking them apart this afternoon things make more sense after seeing how they actually work. It's not rocket science as anyone else who has done them knows, but good to have them done; they were pretty dry.
I did find some info on the vacuum portion test, and I think the specs actually call for 51 seconds run time on the pump, that explains what seem like a long time and as Randy mentioned a little extra.
I did find some info on the vacuum portion test, and I think the specs actually call for 51 seconds run time on the pump, that explains what seem like a long time and as Randy mentioned a little extra.
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