Farm Equipment - 520 flex head AHHC troubles

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520 flex head AHHC troubles

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=175385
Printed Date: 12 Sep 2025 at 1:31pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: 520 flex head AHHC troubles

Posted By: automaticdave
Subject: 520 flex head AHHC troubles
Date Posted: 23 Oct 2020 at 12:30pm

The lever (with the two set screws) that the switch turnbuckle connects to slips or turns or moves forward on the rock shaft, I tighten the setscrews as tight as possible but it won't stay put. I replaced the left outer-upper stabilizer arm retaining pin but no dice, what am I missing on this thing? Thanks Dave

Replies:

Posted By: DrAllis
Date Posted: 23 Oct 2020 at 2:42pm

Start by raising the header clear up and set the safety stop. Pull down on the cutterbar at all linkage locations and make sure the cutterbar is actually DOWN all the way max. Use Gr8 bolts on that arm and get them TIGHT after positioning it where it needs to be. Now weld the arm to the shaft on the end. Now adjust all sensing arms so they all touch the linkage arms all at the same time. After all this, you make have to tweak the adjustable linkage going to the plastic signal arm on the end.

Posted By: automaticdave
Date Posted: 23 Oct 2020 at 3:19pm

Thanks Doc, I wanted to weld it but I wasn't sure if I should before I asked, I will set it up correctly & do it. Thanks again Dave