Construction and other equipment - H3 carb/governor help

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H3 carb/governor help

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=73455
Printed Date: 28 Jun 2025 at 2:18pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: H3 carb/governor help

Posted By: njtom
Subject: H3 carb/governor help
Date Posted: 14 Jul 2013 at 12:03pm

I have a 1965 H3 and it has no power under load and it revs when there is no load or running down hill. I have checked all the governor linkages and they are free and I think I adjusted them properly. my question is it seems like there should be a spring on the idle adjustment/throttle shaft on the carb because it can just flap around loose because it has no tension on it. I don"t see anything in the parts book but it is kind of a gray area because they don"t show the linkage on the carb only the governor linkage. This is my 1st post on the forum so bear with me. Thank you in advance for any help.

Replies:

Posted By: orangeman
Date Posted: 14 Jul 2013 at 12:48pm

Couple of things to check. Is the anti surge spring on connected to the carb. It is attached to the carb upper control linkage and attaches to a manifold stud. If missing this would cause it to surge.

Also, some of the 149/160 gas engines needed to have a small notch relieved in the throttle control quadrant in order to get full power. Allis released a service bulletin on this.

Sent you a PM - call if needed!

Orangeman

Posted By: njtom
Date Posted: 14 Jul 2013 at 5:18pm

Thanks, that spring is definitely missing. I'll give you a call tomorrow early evening. Tom

Posted By: DrAllis
Date Posted: 14 Jul 2013 at 6:36pm

Don't think that series of engine had that type of surge spring. With the engine off, put the hand throttle/foot throttle in the wide open/fast speed position. Then disconnect the carburator link rod ( directly above the generator) from the governor cross arm by removing the cotter pin. Proper adjustment is when the link rod is pulled completely forward (full open on the carb lever) that it will just slide back into the governor cross arm hole without moving the cross arm. If the link rod is too short, you can straighten it some what by removing the kinks until it fits correctly. With this adjustment correct, then see what performance you have. Orangeman's reference was for engines that could not reach high idle of 2200 rpm, there needed to be some more movement/stroke of the throttle linkage to reach that top speed. It had nothing to do with overall governor action.

Posted By: DonBC
Date Posted: 15 Jul 2013 at 11:34am

My D grader did the same thing when I first got it. Mine would start to bog down when you applied some load to the engine and if you adjusted the throttle position to compensate the engine would rev up high when the load came off. I did exactly what DrAllis said and it totally changed how the governor responded. In my case the governor linkage was about 1/2 diameter too long and I put a small bend in the rod to make it align with the hole. Later I did check the condition of the pins and weights just to ease my mind that they were in good condition and not ready to blow apart.

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Jack of all trades, master of none

Posted By: njtom
Date Posted: 15 Jul 2013 at 3:02pm

Thank you guys for the help, that's exactly the same symptom as mine. I'm in nj now and the machine is up at my house in NY, !st thing Saturday morning I'll give it a try and let you guys know how I make out. Tom