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WC engineering question - differential

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Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=112963
Printed Date: 14 Sep 2025 at 8:36pm
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Topic: WC engineering question - differential

Posted By: Redwood
Subject: WC engineering question - differential
Date Posted: 06 Oct 2015 at 6:28pm

So. Does anyone know the reason there is "what I would consider" a bleeder hole in one of the bolts on each side of the differential on the final drive of the WC? It is drilled through the bolt and reamed larger through the head of the bolt. This is one of the bolts that holds the thick flat final drive cover to the housing so the hole is between the final drive and the opening for the brakes. In both of my cases plug solid with oil thickened to grease consistency as expected. I can' think of any machanical reason. If you know I am curious as I have to think it did not work as intended.

Replies:

Posted By: JoeM(GA)
Date Posted: 06 Oct 2015 at 7:43pm

As the oil in the rear end heats, it creates vapor and pressure that has to escape.
If you don't put them back, you risk leakage through axle seals, weeping or dislodging
of the pressed in plug on the back and so on. I'd put them back, why risk another leak? It took 60 ish years to plug up, maybe the grand kids will clean them next time after you're gone!

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Allis Express North Georgia
41 WC,48 UC Cane,7-G's,
Ford 345C TLB

Posted By: Redwood
Date Posted: 06 Oct 2015 at 8:18pm

Thanks Joe makes sense. They are going back no matter what I just wanted to know why it was there. I suppose your right with the time to plug.