Farm Equipment - Power Shift Transmission 8070

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Power Shift Transmission 8070

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=178983
Printed Date: 20 Oct 2025 at 11:05am
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Topic: Power Shift Transmission 8070

Posted By: johnny s brooks
Subject: Power Shift Transmission 8070
Date Posted: 11 Mar 2021 at 3:52pm

Does anyone know if the power shift valve body assembly from an 8070 will bolt up to the transmission housing of a 7045? The reason I would like to change the valve body is that the 8000 series tractors have an oil seal where the lever assembly comes out while the 7000 series tractors have an internal o-ring that is prone to wear and leak (like a major leak).

Replies:

Posted By: DrAllis
Date Posted: 11 Mar 2021 at 7:16pm

Bolts right on.

Posted By: MACK
Date Posted: 11 Mar 2021 at 8:18pm

One reason the old style leaks is because oring gets cut on assembly . If you go to new style , peen around seal to keep it from coming out. MACK

Posted By: johnny s brooks
Date Posted: 12 Mar 2021 at 6:38am

Thanks. I'll check on prices at the salvage yards. If I can stand the cost, I'll make the change.

Posted By: DrAllis
Date Posted: 12 Mar 2021 at 7:14am

I used to add a second oring groove to the old shift shafts.

Posted By: johnny s brooks
Date Posted: 14 Mar 2021 at 2:39pm

Thanks, Dr Allis. Was this a permanent fix or a stop-gap measure?

Posted By: DrAllis
Date Posted: 14 Mar 2021 at 6:00pm

Pretty permanent. Better than one for sure. Even an 8000 needed a seal once in a while.

Posted By: MACK
Date Posted: 14 Mar 2021 at 8:53pm

To keep from cutting oring, slide shaft all the way through , install oring with grease, then pull back into place. MACK

Posted By: tbran
Date Posted: 14 Mar 2021 at 9:04pm

the cab mount holes on the ps housing are different - the tool is different on the two series - have to address that issue.. we just did one.

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When told "it's not the money,it's the principle", remember, it's always the money..

Posted By: johnny s brooks
Date Posted: 16 Mar 2021 at 6:25am

Thanks to everyone. Appreciate the expertise and help.

Posted By: johnny s brooks
Date Posted: 16 Mar 2021 at 6:26am

Thanks to everyone. Appreciate the expertise and help.