New-to-me Wd45 low rpm
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=208414
Printed Date: 04 Oct 2025 at 4:57pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: New-to-me Wd45 low rpm
Posted By: OldManLarry
Subject: New-to-me Wd45 low rpm
Date Posted: 04 Oct 2025 at 11:11am
Good morning gentlemen.
I’ve had a friends WD45 sitting about the farm for a bit. I’d like to put it to work. Starts generally well. New carb, supposedly rebuilt engine.
It fails to maintain rpm while running. Bogs under load from 4’ brush hog in medium grass.
I adjusted the carb/governor arm linkage by bending. It was 3/16” off. While tractor is off, linkage sits just into the gov arm hole with carb at max input. Gov arm on hand throttle/gov body side sits fully engaged at max rpm. After starting, gov arm reduces rpm at carb, hand throttle does not increase rpm.
Can someone post pictures of the throttle side spring linkage, and the carb-side spring linkage? I believe they’re incorrectly installed.
Hand throttle is fully engaged about 3/4 of the way down, but gov arm on gov side is fully engaged for max throttle.
Do you gentleman know what may be the culprit here? Thank you
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Replies:
Posted By: OldManLarry
Date Posted: 04 Oct 2025 at 11:13am
After shutting down tractor, carb and gov arm return to max throttle position.
There’s a large dent, watermelon could sit down in it, in the underside of the oil pan. I see oil lines running to the governor. Maybe there’s a correlation there?
Thank you sirs, I really appreciate your time and knowledge
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Posted By: DrAllis
Date Posted: 04 Oct 2025 at 3:59pm
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Start with this: There CANNOT be ANY SPRING (on the carb side) connected to the governor arm, governor link rod or the carburetors throttle shaft. There SHOULD BE a spring connected to the CHOKE lever that goes to the engine's block drain cock. That is correct. Any spring connected to the governor/carb control on a WD-45 is WRONG. Until this is verified and/or corrected, everything else you do won't be right.
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Posted By: OldManLarry
Date Posted: 04 Oct 2025 at 4:05pm
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DrAllis, thank you. I’ll get that spring in the correct spot. It’s currently just dangling from the gov-carb linkage arm. I’ll check back in after
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Posted By: OldManLarry
Date Posted: 04 Oct 2025 at 4:29pm
Choke plate spring is now connected, holding the choke closed except when choke is pulled. Thank you DrAllis.
The gov. Arm on the carb side still seems to me like it is restricting the rpm’s. Any other ideas? Thank you
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Posted By: OldManLarry
Date Posted: 04 Oct 2025 at 4:36pm
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With the hand throttle at the highest rpm setting, should the govenor arm/linkage at the carb be fully engaged against the carb pin?
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