Farm Equipment - Allis b oil leak

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Allis b oil leak

Printed From: Unofficial Allis
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=208350
Printed Date: 29 Sep 2025 at 7:56pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: Allis b oil leak

Posted By: Dfdsc68
Subject: Allis b oil leak
Date Posted: 29 Sep 2025 at 1:29pm

Hi all, I drained and refilled my rear end/trans on my B. I removed all 3 plugs and allowed all oil to come out. I refilled by the big plug by my left foot. However I think I overfilled it, I have oil coming out from the bottom of the left side axle housing. There’s an inspection hole on the underside of the axle housing I assume to check brakes, and I believe it’s flowing from there. Am I thinking this through correctly?

Replies:

Posted By: HoughMade
Date Posted: 29 Sep 2025 at 3:34pm

Sounds like the seal between the transmission and final drive is leaking.

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1951 B

Posted By: steve(ill)
Date Posted: 29 Sep 2025 at 7:12pm

yes... your axle seal is leaking.... you filled the oil at the 1 inch pipe plug and it fills to the bottom of the plug... Not much room to overfill..... the "hole" on the bottom is a drain for oil that leaks, water that gets in at the top of the brake drum, and to flush out mouse nests that get built inside...... You could run the oil level 1/2 inch low and see if that keeps it from leaking.. Will only drip when tractor is running and slinging oil up to top of the shaft.

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Like them all, but love the "B"s.

Posted By: Dfdsc68
Date Posted: 29 Sep 2025 at 7:17pm

Oh boy. Does anyone have a breakdown to show where this seal is located

Posted By: steve(ill)
Date Posted: 29 Sep 2025 at 7:23pm

i will look for a picture.. basically you want to block the tractor up with that tire 1 inch off the ground. Remove the tire / rim assembly... remove the fender and frame.... remove the 4 big bolts holding the final drive unit to the transmission.. The axle shaft slides thru the seal / bearings into a hollow spline shaft in the differential... You need a good overhead rigging or a engine hoist, etc to pull that final drive and keep it steady to reinstall... the seal is in the bearing retainer on the outside of the trans..

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Like them all, but love the "B"s.

Posted By: steve(ill)
Date Posted: 29 Sep 2025 at 7:29pm

look at the 12:20 mark and it shows what you will see when you slide the final drive case away from the trans..... the bearing retainer has the seal inside...

https://www.youtube.com/watch?v=ZYGIxu0KdA4" rel="nofollow - https://www.youtube.com/watch?v=ZYGIxu0KdA4

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Like them all, but love the "B"s.

Posted By: steve(ill)
Date Posted: 29 Sep 2025 at 7:33pm

better photo from FORUM member.......

https://allischalmers.com/forum/topic93549&OB=ASC&MobileView=off.html" rel="nofollow - https://allischalmers.com/forum/topic93549&OB=ASC&MobileView=off.html

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Like them all, but love the "B"s.