Construction and other equipment - AC HD4 Decellerator pedal ?

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AC HD4 Decellerator pedal ?

Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Construction and other equipment
Forum Description: everything else with orange (or yellow) paint
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=211492
Printed Date: 17 Sep 2026 at 5:23pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: AC HD4 Decellerator pedal ?

Posted By: Tracy Martin TN
Subject: AC HD4 Decellerator pedal ?
Date Posted: 26 Jun 2026 at 9:45pm

I would like to see a pic of your linkage at the pedal and on the pump if you have a HD4 with decellerator pedal. There are 2 models, one is early, one is late. I have a later one, would like to compare to an early one. The manual is not real clear on changes. I saw back about 10 years ago, Orangeman and Don Ditmar were discussing the linkage. Any help appreciated. Thanks, Tracy

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