Farm Equipment - 7020 PST valve

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7020 PST valve

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=189218
Printed Date: 28 Apr 2024 at 8:56pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: 7020 PST valve

Posted By: cowkicker
Subject: 7020 PST valve
Date Posted: 30 Jun 2022 at 5:22pm

7020 trans started acting up today. At times it acts like it is in 2 gears at once and chokes engine down, seems to snap into all the gears when moving shift lever. Don't have time now to work on it now, but thought yall would know what was broken inside and I could get parts ordered. Thanks

Replies:

Posted By: DrAllis
Date Posted: 30 Jun 2022 at 5:32pm

Sounds like a sticking clutch pack plunger valve due to oil that may not be clean. Let it sit overnight and go cold. Tomorrow morning shift from reverse thru 6th gear and back several times shifting as fast as possible. Then, you can try it and see if all is well. Hopefully, you haven't smoked a clutch pack. I like to change oil (8 gall) and filter every 500 hrs AND clean the suction screen to monitor what is going on.

Posted By: MACK
Date Posted: 30 Jun 2022 at 9:25pm

Don't use it until it is fixed. Dollar cost will go up. MACK

Posted By: tthams
Date Posted: 30 Jun 2022 at 10:48pm

I had the exact same thing happen on our powershift. Stuck valves in the valve body.

It didn't take more than a minute or two to burn up a clutch pack. A tractor split and $11,000 later, and it's as good as new.

Good luck!