How those hubs know?
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How those hubs know?
I have a 1993 F250, 7.3L diesel 4x4...
Runs incredibly great for its age.
But the front factory OEM automatic lock outs are having trouble engaging or disengaging. Clicking sometimes.
Ill start by saving you some words by saying Ill probably go to manual Warns soon, but in the meantime I just wanna know how they work.
Ive opened the hubs and found clean well maintained and greased innerds.
I can find no pieces of metal and no indications of anything being broke.
I have removed the main piece of mechanics inside the hub and played with it enough to see how it works. Its nice and smooth.
Somehow, someway something has got to press from the center of the hub to the outside of the hubs to make those cogs lock up. Its got to move about 3/4 " to match up. Its not vacumned in there so what and how does it work? What is the actuator that lock those hubs? Mechanical? roll forward/back? What pushes that thing together? Its a heavy spring and it very strong.
Anybody know?
Runs incredibly great for its age.
But the front factory OEM automatic lock outs are having trouble engaging or disengaging. Clicking sometimes.
Ill start by saving you some words by saying Ill probably go to manual Warns soon, but in the meantime I just wanna know how they work.
Ive opened the hubs and found clean well maintained and greased innerds.
I can find no pieces of metal and no indications of anything being broke.
I have removed the main piece of mechanics inside the hub and played with it enough to see how it works. Its nice and smooth.
Somehow, someway something has got to press from the center of the hub to the outside of the hubs to make those cogs lock up. Its got to move about 3/4 " to match up. Its not vacumned in there so what and how does it work? What is the actuator that lock those hubs? Mechanical? roll forward/back? What pushes that thing together? Its a heavy spring and it very strong.
Anybody know?
Post Fiend
Joined: Feb 2009
Posts: 8,005
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From: Ottawa, Ontario
I was just asking this question a few days ago as I suspect mine are starting to go.
Just put it this way, if one engages and the other doesn't, you'll need a new front differential.... replace those ASAP with manual ones.
Just put it this way, if one engages and the other doesn't, you'll need a new front differential.... replace those ASAP with manual ones.
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split axle
Forgot to say that this truck has the split axle its not a straight one. Therefore it cannot be vacuum assisted. As far as centrifugal force I see no way that is possible. There is nothing that moves out to a wider radii that would engage the cogs.. The only movement in there is a clear and concise lateral movement. It does not twist or turn or screw down. A heavy spring must be pushed laterally from the inside to the outside of the spindle about 3/4"...The spring is tight. What pushes it? Somebody has to know... I totally agree on the new hubs. Im shopping now... But I still want to solve this puzzle.
Cargo Master
Joined: Apr 2003
Posts: 2,408
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From: Parkesburg PA
Normally the axle shaft inside is stationary. When you engage 4wd the axle starts to spin and that causes the hubs to engage through centrifugal force.
Actually centrifugal force may be the wrong term but it is the spinning of the axle that does it. There's a ramp like piece in there that causes them to engage when the axle spins IIRC.
Actually centrifugal force may be the wrong term but it is the spinning of the axle that does it. There's a ramp like piece in there that causes them to engage when the axle spins IIRC.
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
No it's not centrifugal force that does it the hubs can engage on a stationary vehicle, there is supposed to be a ramp system that is engaged by the drive axle but if the outer drive axle U-joint is seized it can but a side load on the hub mechanism and cause locking problems.
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