HD11AG engineering
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=48220
Printed Date: 23 Jun 2025 at 12:58pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: HD11AG engineering
Posted By: catskinner
Subject: HD11AG engineering
Date Posted: 30 Mar 2012 at 8:03pm
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While refitting an HD11AG with a new (1984) Buda a question we can't figure. Sometime around ser. No. 12000 A/C mixed the steering clutch oil with transmission and changed a single stage pump to 2 and scavenged oil from steering res. to return to trans. WHY!?The trans. then uses HYD. fluid instead of 50WT. It seems to me that combining two sys. just isn't the best idea, not enough filtering etc.
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Replies:
Posted By: Calvin Schmidt
Date Posted: 30 Mar 2012 at 9:30pm
Hydraulic oil can be 46, 57, or 68 wt so may not be a problem.
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Nothing is impossible if it is properly financed
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Posted By: Mactractor
Date Posted: 31 Mar 2012 at 3:23am
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HD11E has seperate compartments. Steering oil sucks from left housing (both are linked). Trans oil is sucked from bevel gear housing (divided from steer clutch housings) I have no experience with AGs, but thought they would be same as E models. HD6E and HD6EP have one common resevoir for all compartments. Mac
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Posted By: gemdozer
Date Posted: 31 Mar 2012 at 4:28am
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With wet stering cluch and transmission with pump you could use 20 or 30 oil
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Posted By: catskinner
Date Posted: 31 Mar 2012 at 8:10am
Thanks for responding. My question was regarding the reason they would make a good sys. more complex and combine the two. We run two other, older HD11's that have seperate oil supplies & filters, just wondering if anyone remembered back to the change and if A/C had an explaination.
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Whatever it is, I'm against it! (Groucho Marx)
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Posted By: Mactractor
Date Posted: 31 Mar 2012 at 5:59pm
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Maybe that change occured when they threw out the power brakes, made the brake bands single piece, changed steer pumps from tandem (1 for each side) to single pump for both sides.
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Posted By: DMiller
Date Posted: 01 Apr 2012 at 8:37am
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I wonder if these are the changes that eventually ended with the '7G' series development, it sounds roughly the same setup as the 7G I just go into.
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Posted By: catskinner
Date Posted: 01 Apr 2012 at 9:08pm
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Thank you, do you know if there is a service manual or tech manual on line that you know of that could help me increase my knowledge of these HD-11's
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Whatever it is, I'm against it! (Groucho Marx)
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Posted By: Mactractor
Date Posted: 01 Apr 2012 at 9:46pm
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I`m told you can now view all the manuals online from Minpar. The Fiat Allis service publications index (part 70658800) shows you which manuals suit each model by serial number. Viewing the changes in manuals at certain serial numbers gives you the clues when changes in the machines were made. Worth its weight in gold that little book
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Posted By: catskinner
Date Posted: 01 Apr 2012 at 10:41pm
again, thanks...I operate [400hrsyr] service, fabricate parts, suffer through old crawlers and am interested in the history and development. All reading tips welcome.
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Whatever it is, I'm against it! (Groucho Marx)
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