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Old 09-14-2017, 01:26 AM   #1 (permalink)
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Default Front Swivel Hub Lube

I have a 1981 Sierra SJ410.
The front axle swivel hubs leak a bit of oil.
While I am looking for some new seals, is there any way to top up the oil in the hubs? I have looked for fill plugs on the swivel housing but cannot find any. Where does the oil come from to lube the swivel hubs?
Does it come down the axle shaft from the diff?
Will topping up the diff oil ensure the hubs are lubricated?

Thanks
John
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Old 09-14-2017, 11:51 AM   #2 (permalink)
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The swivel section (CV joint and king pin bearings) are greased upon assembly. If oil is leaking from it then the axle/diff oil seal is leaking
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Old 09-15-2017, 02:01 AM   #3 (permalink)
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Thanks Darrell.
Noticed both swivel hubs weeping some oil after a really hot day of 42C (106F).
Maybe the heat caused oil in the diff to expand and push past the axle seals. Must check the breather on the diff to see if it is blocked.
I find that the 'seals' on the ball part of the housing are only felt material, so would not stop any oil weeping out.
Cheers
John
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Old 09-15-2017, 12:12 PM   #4 (permalink)
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Quote:
Originally Posted by johnfromperth View Post
Thanks Darrell.
Noticed both swivel hubs weeping some oil after a really hot day of 42C (106F).
Maybe the heat caused oil in the diff to expand and push past the axle seals. Must check the breather on the diff to see if it is blocked.
I find that the 'seals' on the ball part of the housing are only felt material, so would not stop any oil weeping out.
Cheers
John
The is a rubber wiper seal behind the felt one. It's quite normal to see a little grease/oil on the swivel ball though as these are rarely smooth any more.
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