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Drivers side Vacuum hub permanently locked?
- Mala43B
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04 Jun 2012 14:32 #41731
by Mala43B
Drivers side Vacuum hub permanently locked? was created by Mala43B
Hi all,
Whilst working under my car I noticed that the drivers side front hub was still locked even though it was in 2H ( turning the right front wheel was turning the prop shaft.).
I switched to 4H and the left hub locked and with all other wheels on the floor except the drivers side, it would now not turn at all, as you would expect. However on switching back to 2H the drivers side hub would not unlock thus turning the prop again.
I removed the driver side hub, and manually unlocked it, however as I refitted it, it locked again. I tried this a number of times and it still locks of its own accord.
This is probably the reason for my poor fuel consumption.
Why could this be happening?
Whilst working under my car I noticed that the drivers side front hub was still locked even though it was in 2H ( turning the right front wheel was turning the prop shaft.).
I switched to 4H and the left hub locked and with all other wheels on the floor except the drivers side, it would now not turn at all, as you would expect. However on switching back to 2H the drivers side hub would not unlock thus turning the prop again.
I removed the driver side hub, and manually unlocked it, however as I refitted it, it locked again. I tried this a number of times and it still locks of its own accord.
This is probably the reason for my poor fuel consumption.
Why could this be happening?
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- Laminak
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04 Jun 2012 15:19 #41732
by Laminak
Replied by Laminak on topic Re: Drivers side Vacuum hub permanently locked?
You can check if you do not have a hose connection blocked

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04 Jun 2012 16:40 - 04 Jun 2012 16:41 #41736
by facade
If it suddenly breaks, go back to the last thing that you did before it broke and start looking there
Replied by facade on topic Re: Drivers side Vacuum hub permanently locked?
You sure that both aren't locking?
With both front wheels on the floor try turning the front propshaft, it should revolve freely in 2wd.
Anyway, as Laminak says check for blockages. Remove the black autohub, then remove the rubber pipes from the swivel housing one at a time. You should be able to blow through the rubber pipe and air comes out of the little filter on the solenoid valve below the battery (with ignition off) , and blow into the steel stub pipe on the swivel housing and hear air come out inside the hub(only with hub removed).
With both front wheels on the floor try turning the front propshaft, it should revolve freely in 2wd.
Anyway, as Laminak says check for blockages. Remove the black autohub, then remove the rubber pipes from the swivel housing one at a time. You should be able to blow through the rubber pipe and air comes out of the little filter on the solenoid valve below the battery (with ignition off) , and blow into the steel stub pipe on the swivel housing and hear air come out inside the hub(only with hub removed).
If it suddenly breaks, go back to the last thing that you did before it broke and start looking there

Last edit: 04 Jun 2012 16:41 by facade.
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- Mala43B
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04 Jun 2012 17:41 #41740
by Mala43B
Replied by Mala43B on topic Re: Drivers side Vacuum hub permanently locked?
The left hub locks and unlocks but the right one stays locked and even locks itself if I manually unlock it and replace the hub.
The prop wont turn when both wheels are on the floor & in 2H but will once I remove the right hub.
The prop wont turn when both wheels are on the floor & in 2H but will once I remove the right hub.
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04 Jun 2012 17:49 #41741
by facade
Both hubs are locked, not just one
(the same thing will happen if you remove the left hub)
Most likely you have a fault with the vacuum system.
If it suddenly breaks, go back to the last thing that you did before it broke and start looking there
Replied by facade on topic Re: Drivers side Vacuum hub permanently locked?
Mala43B wrote: The prop wont turn when both wheels are on the floor & in 2H but will once I remove the right hub.
Both hubs are locked, not just one
(the same thing will happen if you remove the left hub)
Most likely you have a fault with the vacuum system.
If it suddenly breaks, go back to the last thing that you did before it broke and start looking there

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04 Jun 2012 18:02 #41744
by Mala43B
Replied by Mala43B on topic Re: Drivers side Vacuum hub permanently locked?
When I select 4H the 4WD light on the dash comes on although does not flash.
I know for sure the left hub locks and unlocks OK but the right one will not unlock.
I can hear a hissing noise when I remove the right hub (still in 2H) so as soon as I replace the hub, it locks even though I have not selected 4H.
I know for sure the left hub locks and unlocks OK but the right one will not unlock.
I can hear a hissing noise when I remove the right hub (still in 2H) so as soon as I replace the hub, it locks even though I have not selected 4H.
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