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Vacuum locking hubs

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09 Jun 2022 16:27 #243644 by ThomasB
Vacuum locking hubs was created by ThomasB
I have had an issue with my vac hubs not engaging.
At first I diagnosed it as a vacuum leak due to perished rubber hose, after replacing the hose the system still didn’t operate properly. The Green light flashes a few times, then goes solid but there is no clunk. After playing around with it for a bit I noticed the vac line to disengage the hubs has constant vacuum so when the vacuum to engage it goes on it doesn’t work because both sides are in vacuum. If I take off the disengage hose and press 4wd it engages fine because one side is atmospheric and other is vac how it should be.

any idea why the disengage hose has a constant vacuum?

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09 Jun 2022 18:15 #243645 by Lambert
Replied by Lambert on topic Vacuum locking hubs
The solenoid valves can stick. blowing them through with an air line regulated down to 5psi can clear them . Be very careful with the air though as a little goes a long way and you can mess up seals/internals easily.

Temeraire (2018 quasar grey automatic)
One of the last 200ish of the gen3s, probably.

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09 Jun 2022 19:27 #243647 by ThomasB
Replied by ThomasB on topic Vacuum locking hubs
Thanks for this tip, where is the best place to attach the compressor nozzle?

Thanks

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09 Jun 2022 22:32 #243653 by Lambert
Replied by Lambert on topic Vacuum locking hubs
The solenoid valves are under the battery just to make access easy. I removed the lines there when I did mine.

Temeraire (2018 quasar grey automatic)
One of the last 200ish of the gen3s, probably.

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10 Jun 2022 13:38 #243660 by ThomasB
Replied by ThomasB on topic Vacuum locking hubs
I put a couple psi of air in the line but it still has constant vac.
Is there anything else it could be it do I just need a new solenoid now?

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11 Jun 2022 12:56 #243671 by Busta
Replied by Busta on topic Vacuum locking hubs
One more thing to try which is swapping the solenoids around. If the problem moves with it then you need a new solenoid, They are plentiful, available from anyone who has fitted manual hubs.
 

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