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Auto 4wd not working only manual lock in hubs

  #1  
Old 11-16-2018, 06:45 AM
Robertmbianco
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Auto 4wd not working only manual lock in hubs

Went to plow for the first time this year. And my auto 4wd would not engage. No problem when i locked in hubs. Same thing happen last year, then cleared up. Any advice?
 
  #2  
Old 11-16-2018, 07:37 AM
seville009
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I just manually lock mine when the snow starts and leave them locked all winter. Much easier.

You can get it fixed, but you really donít need to.

 
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Old 11-16-2018, 07:40 AM
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Yeah i just find it strange that it all of a sudden fixes itself, or clears up. Maybe just a clog in the vacuum? Idk
 
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Old 11-16-2018, 07:43 AM
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Kinda pisses me off though, because i would rather have the lock ins for an emergency. Otherwise why have the darn auto thing? Idk. Wish the darn 4wd's were like they used to be, back in the 70's.
 
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Old 11-16-2018, 08:28 AM
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Probably the vacuum solenoid not liking the temperature change. My best guess, I'm not an expert on it though.
 
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Old 11-16-2018, 10:19 AM
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Yeah just funny that this happened last year for the first storm. Then my dial, without locking the hubs, worked fine all winter. Seems like some type of blockage? Idk. Weird. I guess i'll see what happens next time. Whether i need to lock the hubs in or not. At least i have the option. I guess
 
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Old 11-16-2018, 10:23 AM
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I only use my 4wd in the winter. Never go off road anymore. My off road adventures are over now. I grew up. Unfortunately! Ha ha. Not really, just no more time for cool fidhing excursions anymore. Bummer
 
  #8  
Old 11-16-2018, 11:33 AM
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Again, my understanding of the system is limited, but I would assume it would work like this.

Vacuum supplied to main vac line. Main vac line runs to hub, then to solenoid for actuation. If the solenoid doesn't actuate, then the wheel hub acts as a solenoid bypass. If there was a blockage, it would seem unlikely to clear during the change in seasons in my opinion, unless it was ice somehow forming in the lines. However, that would clear up once the engine compartment became heated.

I'd bet the solenoid is the problem, but someone else may know better.
 
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Old 11-16-2018, 11:39 AM
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Thanks, you could very well be right. I'll let you know what happens throughout this year. I guess I should be happy that i have the alternative to lock the hubs in and bypass that problem.
 
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Old 11-16-2018, 02:51 PM
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Sounds like an intermittant vacuum solenoid. Best tool for diag on this system is a vacuum gauge.
 
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Old 11-16-2018, 03:46 PM
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FYI - the solenoids are usually easy to change, and cost around $30-$50. So, not a tough fix, nor a huge investment if the diagnoses is wrong.
 
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Old 11-17-2018, 09:15 AM
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I've had issues in the past with the vacuum system of my hubs. Replacing all the lines did the trick, and it was fairly cheap as well. Then again, at that time the truck has 170k and they looked original.
 
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Old 11-17-2018, 09:55 AM
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Just lock the hubs before you leave and engage 4x4 whenever you need it.
 
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Old 11-17-2018, 10:23 AM
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Originally Posted by 00t444e View Post
Just lock the hubs before you leave and engage 4x4 whenever you need it.

I'm curious, since I spend my winters in Breckenridge, CO, is there a speed restriction when locking the hubs and driving? I'll probably do the same since I also tow an 8k trailer even during winter, so it might make things a little less sketchy.
 
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Old 11-17-2018, 10:25 AM
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Originally Posted by pilotmjohnson View Post
I'm curious, since I spend my winters in Breckenridge, CO, is there a speed restriction when locking the hubs and driving? I'll probably do the same since I also tow an 8k trailer even during winter, so it might make things a little less sketchy.
No I go down the highway at 85 mph with the hubs locked no problem.
 

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