AA 1920 governor
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=125900
Printed Date: 05 Sep 2025 at 10:24am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: AA 1920 governor
Posted By: automaticdave
Subject: AA 1920 governor
Date Posted: 14 Jul 2016 at 10:01am
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Hello, BIL bought this lawn tractor from a dealer because it had 3pth & front hydraulics witch he wanted to put on another 1920 he had. Dealer told him that tractor needed a cam shaft. I bought tractor from BIL and the engine ran good, after cutting grass with it for about 15 mins governor quit working & engine rev up. Could someone tell me where & what to look for before I pull engine off of tractor ? thanks Dave
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Replies:
Posted By: thendrix
Date Posted: 14 Jul 2016 at 10:09am
Gov spring maybe?
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"Farming is a business that makes a Las Vegas craps table look like a regular paycheck" Ronald Reagan
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Posted By: Butch(OH)
Date Posted: 14 Jul 2016 at 11:54am
Check for binding in the external linkage prior to tearing into the engine but the governor gears were problematic on those and when the gear sheds it's teeth what you describe is what happens. If the linkages are adjusted correctly the engine should slow down to idle but when you increase it just a bit the engine runs away. As for replacing the gear the news isnt good as good bit of the engine must come apart to replace it.
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Posted By: automaticdave
Date Posted: 14 Jul 2016 at 2:06pm
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Thanks Butch, you described the idle & run away engine rpm to a tee on this thing. I looked down the oil filler pipe & see the plastic gear meshing & turning with the cam gear when I turn crank by hand. On the rite side of engine in behind the oil stick tube there is star headed long stem bolt that was loose & had backed out 2 turns or so, would that have any thing to do with this problem? Thanks Dave
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