Construction and other equipment - AC hd4 will go in reverse but not forward

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AC hd4 will go in reverse but not forward

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=206074
Printed Date: 26 Apr 2025 at 9:52am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: AC hd4 will go in reverse but not forward

Posted By: PatS
Subject: AC hd4 will go in reverse but not forward
Date Posted: 29 Mar 2025 at 7:03am

Considering buying an hd4. The machine will go in reverse but not in forward. The current owner says he bought it that way but couldn't figure out how to repair it. I am asking what are the possible issues with it not driving forward and what might be the cost involved?

Replies:

Posted By: Tracy Martin TN
Date Posted: 30 Mar 2025 at 5:20pm

It could be bad shuttle gear, or as simple as something stuck in forward reverse valve. Easy to check for pressure, hyd activated. HTH Tracy

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