Hubs not locking - Auto?
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Tuned
Joined: Aug 2003
Posts: 341
Likes: 3
From: McMinnville
Hubs not locking - Auto?
OK, just to make sure I am under the right impression. I have the front wheels set on Auto and when engaging the 4WD HIGH they do not engage, I must manually go out and switch them to manual. This makes a world of difference and engages the front end. Is there a vacuum leak possibly, any common places for a leak? I had thought if there was a leak that when I first turn the ignition on an you hear the air pump (I think it is an air pump) that it would keep going if there was a leak. I will be searching as well but thought I would ask as well.
Post Fiend
Joined: May 2009
Posts: 5,470
Likes: 3
From: Pea Ridge, AR
You likely have a leak at either the lines going down to the hub or the seal inside the hub or on the back of the unit bearing. If your A/C vents are not going to defrost when you engage the ESOF, you may have an issue with the pulse actuator. Usually it's just a leak though.
Welcome to guzzle's 4x4 Autolock Hub Lubrication Maintenance Web Page
Welcome to guzzle's 4x4 Needle Bearing Maintenance Web Page
Welcome to guzzle's 4x4 Autolock Hub Lubrication Maintenance Web Page
Welcome to guzzle's 4x4 Needle Bearing Maintenance Web Page
Thread Starter
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Tuned
Joined: Aug 2003
Posts: 341
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From: McMinnville
BigAl,
Can you expand on what you mean about the AC? I noticed that when I had 4wd and the hubs were set to auto and not locking, my AC would not work/send cold air - I just figured something was wrong or its a known thing that when in 4wd - you don't get cold air - lol... But mine does not flow cold, I almost thought the AC clutch disengaged or something - but I didn't follow up. I will look at your links you provided, thank you!
Based on the research - it almost sounds like it is a good thing they are not working in "auto" because then I can run 4L which is really 2L when towing up steep grades or even down steep grades - do I interpret the research correctly?
Can you expand on what you mean about the AC? I noticed that when I had 4wd and the hubs were set to auto and not locking, my AC would not work/send cold air - I just figured something was wrong or its a known thing that when in 4wd - you don't get cold air - lol... But mine does not flow cold, I almost thought the AC clutch disengaged or something - but I didn't follow up. I will look at your links you provided, thank you!
Based on the research - it almost sounds like it is a good thing they are not working in "auto" because then I can run 4L which is really 2L when towing up steep grades or even down steep grades - do I interpret the research correctly?
Post Fiend
Joined: May 2009
Posts: 5,470
Likes: 3
From: Pea Ridge, AR
Your A/C clutch issue is likely the air gap
SpringerPop's Compressor Clutch Air Gap
As for what I was talking about. If your vents were blowing any air through the dash vents and then you engaged the ESOF, if you have a leak, the air will move from blowing out of the dash to the defrost vents.
As for your research, yes the auto has no way to turn "off" unless you install a bypass switch for the pulse vacuum hub solenoid to not send the vacuum to the hubs to actuate them.
SpringerPop's Compressor Clutch Air Gap
As for what I was talking about. If your vents were blowing any air through the dash vents and then you engaged the ESOF, if you have a leak, the air will move from blowing out of the dash to the defrost vents.
As for your research, yes the auto has no way to turn "off" unless you install a bypass switch for the pulse vacuum hub solenoid to not send the vacuum to the hubs to actuate them.
Thread Starter
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Tuned
Joined: Aug 2003
Posts: 341
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From: McMinnville
BigAlPSD,
OK, I wanted to check my "mind" so I went out to test. I have already done that AC fix and it worked great. So, I turn the truck on, turn AC on, then switch to panel heat and cool - everything works. I turn it to 4High, then all of a sudden the panel air switches to defrost - just like you have mentioned. It doesn't have anything to do with AC, because when it was coming out of the defrost - I turned off AC and put it on panel and it still came out the defroster. Weird.
In conclusion - does this mean I haveb an air or vacuum leak in the line somewhere? Is this a different issue than the vacuum line that controls the hubs or is it probably all related?
Thanks for your time and effort. I like the idea of a bypass switch. I was just telling my wife that a guy on here modified the panel next to the 4High 4Low swith by adding four/five rocker switches and painted them black to look stock. She asks, what would I do with all of those switches...... I only came up with two, here is another to add to my list
. I only came up with reverse lights and fog lights. LOL....
OK, I wanted to check my "mind" so I went out to test. I have already done that AC fix and it worked great. So, I turn the truck on, turn AC on, then switch to panel heat and cool - everything works. I turn it to 4High, then all of a sudden the panel air switches to defrost - just like you have mentioned. It doesn't have anything to do with AC, because when it was coming out of the defrost - I turned off AC and put it on panel and it still came out the defroster. Weird.
In conclusion - does this mean I haveb an air or vacuum leak in the line somewhere? Is this a different issue than the vacuum line that controls the hubs or is it probably all related?
Thanks for your time and effort. I like the idea of a bypass switch. I was just telling my wife that a guy on here modified the panel next to the 4High 4Low swith by adding four/five rocker switches and painted them black to look stock. She asks, what would I do with all of those switches...... I only came up with two, here is another to add to my list
. I only came up with reverse lights and fog lights. LOL....
Post Fiend
Joined: May 2009
Posts: 5,470
Likes: 3
From: Pea Ridge, AR
You have a vacuum leak, either at the lines or the hub itself usually. Sorry I used the term A/C when I should have just said the air, no matter what temp.
You could go with a F650 Dash from Clay for your accessories!
Riffraff Diesel: Riffraff Custom Auto Dash Kit
You could go with a F650 Dash from Clay for your accessories!
Riffraff Diesel: Riffraff Custom Auto Dash Kit
Senior User
Joined: Oct 2009
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From: Driftwood Pa & Duncan OK
Ahh, big Al I love you, LoL!
You described an issue I've been having with a vacuum leak since I bought the truck, and I forgot that the auto hubs are vacuum controlled (converting them to true manual was one of the first things I did to the truck).
I believe I know what my issue is now as it fits exactly what you mentioned (it wasn't causing issues after rigged part of the vacuum system on the control box [or whatever is on the passenger side fender, lol?] so I ignored it)
Will look into it tomorrow, sorry for the thread hijack! XD
RoD
EDIT: I agree with Al regarding the vacuum leak also, regarding the auto-lock issues.
You described an issue I've been having with a vacuum leak since I bought the truck, and I forgot that the auto hubs are vacuum controlled (converting them to true manual was one of the first things I did to the truck).
I believe I know what my issue is now as it fits exactly what you mentioned (it wasn't causing issues after rigged part of the vacuum system on the control box [or whatever is on the passenger side fender, lol?] so I ignored it)
Will look into it tomorrow, sorry for the thread hijack! XD
RoD
EDIT: I agree with Al regarding the vacuum leak also, regarding the auto-lock issues.
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