Welcome! Please use the navigational links to explore our website.
PartsASAP LogoCompany Logo (800) 853-2651

Shop Now

   Allis Chalmers Case Farmall IH Ford 8N,9N,2N Ford
   Ferguson John Deere Massey Ferguson Minn. Moline Oliver
 
Marketplace
Classified Ads
Photo Ads
Tractor Parts
Salvage

Community
Discussion Forums
Project Journals
Your Stories
Events Calendar
Hauling Schedule

Galleries
Tractor Photos
Implement Photos
Vintage Photos
Help Identify
Parts & Pieces
Stuck & Troubled
Vintage Ads
Community Album
Photo Ad Archives

Research & Info
Articles
Tractor Registry
Tip of the Day
Safety Cartoons
Tractor Values
Serial Numbers
Tune-Up Guide
Paint Codes
List Prices
Production Nbrs
Tune-Up Specs
Torque Values
3-Point Specs
Glossary

Miscellaneous
Tractor Games
Just For Kids
Virtual Show
Museum Guide
Memorial Page
Feedback Form

Yesterday's Tractors Facebook Page

  
Farmall & IHC Tractors Discussion Board

Governor action


[ Expand ] [ View Replies ] [ Add a Reply ] [ Return to Forum ]

Posted by LenNH on February 18, 2010 at 08:28:11 from (24.60.236.239):

A recent post was from a fellow who wanted to understand better how a governor works. One of the replies compared the governor weights to something heavy attached to a string. This was a good comparison--as the string is spun faster, the weight goes out. In a governor, the weight going out would tend to close the throttle, through a linkage system that doesn't need to be described here (the linkage would vary with the engine, location of the governor itself, etc.).
If you have a fairly "modern" tractor (with IHC, this means letter series, or 1939 and later), you have a "variable governor." In this system, there is a range of speeds over which the governor works to maintain engine speed. The governor control ("throttle lever" is what most of us would call it) pulls a spring which is attached through linkages to the carburetor butterfly valve. The farther the lever is pulled toward "fast," the more the butterfly valve is opened. The governor weights work against this spring, in effect. If the operator has set half-throttle, the governor weights will move in and out as necessary, moving the butterfly valve slightly, to maintain the desired speed.
There are no springs on the weights of variable-speed governors.

Many earlier tractors, including most of the IHC numbered series except F-12, had what I used to hear called a "throttling governor." The weights on this type of governor have springs that tend to pull the weights together toward "wide-open throttle" position. The spring forces were calibrated to give a certain full-load speed (like 1000 rpm on a 10-20). If the throttle lever were removed, nothing would happen except that the engine would run at the full governed speed all the time (in this case, somewhat higher than 1000 rpm if there was no load). If you look at the mechanism of the earlier IHC governors, you will see that the throttle linkage goes over to the left side of the engine. Inside the little round box, there is a lug on the butterfly-valve shaft. When the throttle lever is pulled toward "slow," the little lever you can see on the outside just
engages this lug and closes the throttle. The result is that the engine slows down, but that there is no governing action. I used to rake hay with a '36 F-20, and to avoid a lot of noise, I tried to run in 4th gear, throttled way back. Great on level fields, but a real pain going up and down hills, because you had to constantly adjust the throttle lever to keep the ground speed steady. With a variable governor, you have full governor action at a certain point somewhat above idle speed.
On this old-style governor, there is a SLIGHT adjustment provided for the full-load speed. This is that little bulb-like thing that sticks out the back of the governor housing. It can be turned to vary the tension on a spring that works on the throttle linkage after it leaves the governor weights.
IHC added variable governors to the "old" tractors sometime in the middle thirties. I'd have to do some looking at parts books and such to get an exact date, but I am going to say that this happened in about 1937. The factory-installed variable governor has a bellows coming out the back of the governor, and a pull-rod which goes to the operator's station through whatever linkage makes it work for a particular model. On an F-20, the throttle control is a flat, notched "rod" very similar in appearance to the throttle on an F-12. This "rod" is on the LEFT side of the gas tank. IHC made a kit to install the new-style governor on older tractors. This is very similar, but the notched rod is on the RIGHT side of the tank. Several outside manufacturers made retro-fit variable governor kits. Some of these have a decidedly clunky look in the rods and levers that end up in front of the driver. One quick tipoff to the presence of a retrofit governor kit is the original throttle lever, which was seldom removed because its shaft supports the spark lever.
I hope this makes sense. It does to me, but maybe that is only because I spent over 10 years driving tractors with the "throttling governor," and many more years driving tractors with the "variable governor."
Somewhere, in my so-called collection of
parts books, brochures and the like, I probably can provide pictures of all the things I tried to describe. I'll get on this "when I get a chance," as we used to say for things we just might get around to sometime.


Replies:




Add a Reply

:
:
:

:

:

:

:

:

:

Advanced Posting Options

: If you check this box, email will be sent to you whenever someone replies to this message. Your email address must be entered above to receive notification. This notification will be cancelled automatically after 2 weeks.



 
Advanced Posting Tools
  Upload Photo  Select Gallery Photo  Attach Serial # List 
Return to Post 

TRACTOR PARTS TRACTOR MANUALS
We sell tractor parts!  We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]

Home  |  Forums


Today's Featured Article - Box Plow Blues - by Tom Schwarz. One of the first implements most tractor owners obtain is the box plow. For very little money, this piece of equipment promises to plow and flatten any hill or vale on your ranch road or farm. At least that's what I thought! As simple as a box plow appears, it can be rather challenging to make work correctly. In our sandy soils of Florida, traction is king. You can never have wide enough tires or heavy enough weights to get all the traction you want … unless you own a monster tractor. U ... [Read Article]

Latest Ad: Oliver 550 Diesel runs like a watch three point hitch pto engine gone threw about two hundred hours ago nice clean tractor [More Ads]

Copyright © 1997-2024 Yesterday's Tractor Co.

All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy

TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.

Yesterday's Tractors - Antique Tractor Headquarters

Website Accessibility Policy