Construction and other equipment - Allis Chalmers HD11 GC

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Allis Chalmers HD11 GC

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=154514
Printed Date: 12 Aug 2025 at 5:21pm
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Topic: Allis Chalmers HD11 GC

Posted By: orangeman
Subject: Allis Chalmers HD11 GC
Date Posted: 03 Oct 2018 at 2:41pm

Hello AC Team:

Anyone have a photo of the AC HD11GC - am assuming this was a later loader version, circa early 70ś with a torque converter?

Maybe had the updated 11000 engine with a turbo?

Thanks for any insights!

Orangeman

Replies:

Posted By: rickv57
Date Posted: 05 Oct 2018 at 4:38pm

The HD 11 EC and the 11 GC was made in the early 60s with a 10000 engine as I recall, there is a11 GC loader advertised on machinery trader for 10900, there is a few pictures with it

Posted By: DMiller
Date Posted: 05 Oct 2018 at 5:50pm

The HD11G on MT is a 1972, power shift hydraulic assist steer. Is Naturally Aspirated.

Posted By: rickv57
Date Posted: 05 Oct 2018 at 6:07pm

They have it listed as a 1972 model but it has a serial number of about 8800 which makes that early 60s when they made the the torque converter 11s They wasn't too Poplar and they was only made it a couple of years.

Posted By: rickv57
Date Posted: 05 Oct 2018 at 6:09pm

Also the round nose 11s was discontinued in 1969 when they started the B series Square nose

Posted By: rickv57
Date Posted: 05 Oct 2018 at 6:13pm

If you study the pictures I have never seen a power shift with a master clutch handle

Posted By: orangeman
Date Posted: 05 Oct 2018 at 6:41pm

Thanks for the insights guys - so did Allis produced an 11G (i.e. loader) version with the square grill?

Orangeman

Posted By: orangeman
Date Posted: 05 Oct 2018 at 6:49pm

Interesting - the 11G on MT has one open spoke front idler the other side is solid drum.

Was there interchange potential between Allis 11 G and an suitable sized Caterpillar Model.

I need to get my pitch charts out!

Orangeman

Posted By: rickv57
Date Posted: 05 Oct 2018 at 6:56pm

That open spoke front idler what is OEM, the solid is a replacement

Posted By: rickv57
Date Posted: 05 Oct 2018 at 6:58pm

In 1967 the 12 G was introduced, it had 11,000 turbo engine and they 16 size undercarriage, a little larger than the old 11g

Posted By: ACjack
Date Posted: 05 Oct 2018 at 7:56pm

The 10000 series engine was the non turbo charged version of the 516 CID Engine and the 11000 series engine was the turbo charged version.

Posted By: orangeman
Date Posted: 06 Oct 2018 at 4:54am

Excellent information RickV57, DMiller and ACJack. I pulled Norms Construction Book late last night and gave myself a tune up on the 11g, and 12G.

I see AC also sold an 8G but was not available here in the U.S ~ wonder if any of the 8gś filtered into Canada?

Appreciate all the good insights!

Orangeman