Construction and other equipment - Question to Coke and Hector Gemme

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Question to Coke and Hector Gemme

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=54181
Printed Date: 25 Jun 2025 at 10:48am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: Question to Coke and Hector Gemme

Posted By: DMiller
Subject: Question to Coke and Hector Gemme
Date Posted: 25 Jul 2012 at 11:13am

You fellas know I have a HD7G, what are the differences from mine to a 7G-B? I have seen one from a distance and it looks 'similar' but different, like segmented drive sprocket and single upper guide roller.

Replies:

Posted By: gemdozer
Date Posted: 25 Jul 2012 at 12:07pm

The hd7g has a 4 cylinder motor and the HD7GB has a 6 cylinder motor d3500 and have a HD11 track and special idlers and segment sprocket

Posted By: DMiller
Date Posted: 25 Jul 2012 at 2:07pm

Thanks Hector, do the machines (7G and G-B) share the same style final drives/housings? If they do I wonder if a sprocket center from a 7G-B would work on a 7G?

Posted By: gemdozer
Date Posted: 25 Jul 2012 at 2:24pm

The HD7GB sprocket center should fit but the outside sprocket is smaller with 5 segment 5 teeths and the 7g should have 27 teeths and the track frame is 't the same and should have 1 or 2 more rollers on 7GB

Posted By: DMiller
Date Posted: 25 Jul 2012 at 2:28pm

Thanks Hector, this may be a starting point to putting an 'other' manufacturer's (Cat) rails under my 7G. I was looking for a better alternative to custom building a sprocket, the 7GB part might be a starter for me to look at.