Farm Equipment - AGCO 6690 Stuck in hi-gear

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AGCO 6690 Stuck in hi-gear

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=160243
Printed Date: 14 Apr 2026 at 8:13pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: AGCO 6690 Stuck in hi-gear

Posted By: deveshoe
Subject: AGCO 6690 Stuck in hi-gear
Date Posted: 21 Apr 2019 at 9:40am

Hey folks,

I have a 6690 that is stuck in rabbit. the 1-4 shifting works fine. I went to shift into lo(turtle) yesterday and the shifter had no resistance at all. I looked underneath and the ball/socket connection had come undone. I got it back into place and it doesn't want to move. any thoughts or suggestions would be much appreciated. disclaimer I'm about as novice as they come on repair stuff.

Replies:

Posted By: Ryan Renko
Date Posted: 21 Apr 2019 at 8:41pm

We also have a 6690 we bought new that only has 900 hours on it and we have already replaced two of those chintzy ball and socket linkages. We are fortunate that Agco still has these parts but if this problem continues maybe we should buy a dozen just to have them! Did you replace the bad linkage? Is it still stuck in that gear afterwards? Those three shift levers are junk. You never really know what gear you are in. Ryan

Posted By: Auntwayne
Date Posted: 21 Apr 2019 at 9:34pm

What I find that works best is to gently "GENTLY" rock the tractor forward and backward until the direction you are wanting falls into place. Not Rocket Surgery, but works every time.

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