HD 5 Gearbox Question
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=156676
Printed Date: 18 Sep 2025 at 4:59am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: HD 5 Gearbox Question
Posted By: HD5guy
Subject: HD 5 Gearbox Question
Date Posted: 26 Dec 2018 at 2:03am
Hi there, I've come to this site to ask about the HD 5 crawler tractor's gearbox. We have two working HD 5's and a third which was dismantled for spares. One thing we've always noticed is that one is far lower geared than the other.. This was confirmed by my Dad and Grandad in a straight line "drag-race" many years ago. Recently we had to take the gearboxes out of both tractors to replace some seals and we figured it would be an optimal time to swap the gearboxes over, so that the lower geared one was in the 'better' tractor for more pushing power.
When we put the lower geared gearbox into the other tractor and fired it up, however, we found it goes exactly the same speed and has no more pushing power than before.
This is where my question is: If the gearbox itself is not lower geared, what makes the slow tractor go slow? Surely the crown wheel can't be different. Any insight is appreciated!
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Replies:
Posted By: truckerfarmer
Date Posted: 26 Dec 2018 at 6:48am
First off, welcome to the forum. I don't have the answer to your question, but if you post this in the construction section you will have a better chance of getting the correct answer. There are a few fellas that have a wealth of knowledge that may be able to give you the correct answer. Oh, by the way, we all love to see pictures of equipment. Good luck.
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Looking at the past to see the future.
'53 WD, '53 WD45, WD snap coupler field cultivator, #53 plow,'53 HD5B dozer
Duct tape.... Can't fix stupidity. But will muffle the sound of it!
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