Repairing HD11E Idler
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=65467
Printed Date: 27 Jun 2025 at 10:56am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: Repairing HD11E Idler
Posted By: bottleworks
Subject: Repairing HD11E Idler
Date Posted: 17 Feb 2013 at 11:37pm
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I own a 1957 HD11E with heavly worn idler wheels on both tracks. The center "alignment hump" was allowed to be worn to the point that it started collapsing/folding in on itself. I'm in the middle of replacing the center section. I'm using 2 1/2" wide x 1/2" plate. My plan is to do two layers for a 1" total height. Does anyone know what the original height was? Does anyone foresee any issues with a 1" height? |
Replies:
Posted By: Steve allis dozer
Date Posted: 18 Feb 2013 at 2:58am
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the manual i have lists outside flange dia (alignment hump as you've called it) as 30.38" (771.65mm) and the diameter that the track runs on is 28.56"(725.42mm) hope this helps , If you measure from the track rail to the pin bush should give you the thickness you can use! if it is to high it will run on the pins instead of rails
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Posted By: bottleworks
Date Posted: 18 Feb 2013 at 12:33pm
| ok, and just to be clear - it shouldn't be riding on the pin, correct? |
Posted By: Coke-in-MN
Date Posted: 18 Feb 2013 at 1:09pm
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Look under the one HD5 post - I put up a picture of a HD5 track gauge and it might give you a idea of the height / width of the idler in relation to track and rollers . If the idler is worn that far the roller shells probably are worn also .
The pins should not touch the idler nor should the end of the pins in the track hit the roller shell outer flange. ------------- Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something. "Challenges are what make life interesting; overcoming them is what makes life meaningful." |
Posted By: gemdozer
Date Posted: 18 Feb 2013 at 4:05pm
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The HD11 idler center height is 27.046" and the shoulder is 25.125" |
Posted By: bottleworks
Date Posted: 19 Feb 2013 at 3:31pm
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Yes, the roller shells are worn, but not proportional to the idlers. I know the last owner replaced both drive sprokets. I'm not sure if he also replaced the chain, or anything else. I'll post a picture when the rain stops. I'm a diesel mechanic, but I don't work on tracked vehicles, so I'm completely new to tracked undercarriage. I'm still sorting though the terminology. |
Posted By: bottleworks
Date Posted: 21 Feb 2013 at 2:13am
Some photos...   |
Posted By: Dozer
Date Posted: 22 Feb 2013 at 12:56pm
| The pictures show that the chain is badly worn on the outside because of misalignment. The pins look exelent so the chain was rebuilt or changed. Is the inside of both chains worn as much as the picture shows the outside is? |
Posted By: bottleworks
Date Posted: 22 Feb 2013 at 6:24pm
| The outside of the left chain measures 3 5/8" and the inside measures 3 3/4". NC has turned into Seattle (more rain), so I haven't measured the right chain yet. |