Farm Equipment - Seasonal disconnect?

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Seasonal disconnect?

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=210656
Printed Date: 07 Apr 2026 at 3:24am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: Seasonal disconnect?

Posted By: whatscooking
Subject: Seasonal disconnect?
Date Posted: 06 Apr 2026 at 5:51pm

What does it take to seal that shaft where it goes into the side of the tractor?

Replies:

Posted By: SteveM C/IL
Date Posted: 06 Apr 2026 at 6:09pm

what tractor?

Posted By: AC720Man
Date Posted: 06 Apr 2026 at 6:18pm

I’m guessing 6060,6070,6080?

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1968 B-208, 1976 720 (2 of them)Danco brush hog, single bottom plow,52" snow thrower, belly mower,rear tine tiller, rear blade, front blade, 57"sickle bar,1983 917 hydro, 1968 7hp sno-bee, 1968 190XTD

Posted By: DrAllis
Date Posted: 06 Apr 2026 at 6:45pm

The D-21 PTO seasonal disconnect shaft oil seal is an O-ring (certain size and hardness) that fits in a groove on the levers shaft. To remove the shaft, one must remove a roll pin (or maybe a solid groove pin) from the inside of the four-speed transmission. It's normally a hammer and punch kind of removal. I've never done one in chassis before and don't know how much room there is to work in that area after removing the platform and shift cover from the top of the transmission. I'm pretty sure if the four-speed was split from the rear end and rolled ahead 3 or 4 feet, there would be a way to drive out that pin from the rear. If there's enough room from above, I'm sure I could figure out a way to remove the pin from the top, instead of a split. Anyway one goes about it, easy it will not be.

Posted By: whatscooking
Date Posted: 06 Apr 2026 at 6:51pm

DrAllis wrote:

The D-21 PTO seasonal disconnect shaft oil seal is an O-ring (certain size and hardness) that fits in a groove on the levers shaft. To remove the shaft, one must remove a roll pin (or maybe a solid groove pin) from the inside of the four-speed transmission. It's normally a hammer and punch kind of removal. I've never done one in chassis before and don't know how much room there is to work in that area after removing the platform and shift cover from the top of the transmission. I'm pretty sure if the four-speed was split from the rear end and rolled ahead 3 or 4 feet, there would be a way to drive out that pin from the rear. If there's enough room from above, I'm sure I could figure out a way to remove the pin from the top, instead of a split. Anyway one goes about it, easy it will not be.

If it's split for a clutch does that help?

Posted By: DrAllis
Date Posted: 06 Apr 2026 at 6:56pm

That would require lifting the complete control module off the top of the bell housing and splitting it from the front of the four-speed transmission. Probably could be done that way but a lot of work. A rear split is easier. Is there a clutch problem too ??

Posted By: whatscooking
Date Posted: 06 Apr 2026 at 6:59pm

Transmission fluid out the hole.