Problems with AC 175 governor

[Roy Gatewood]

I have Allis 175. The governor used to respond a little slow to the throttle movement. Now it does not. It has stuck high for a short time. Killed it with key switch. Eventually it would respond to the throttle as normal. Once it sets for a day it will start at a very slow idle or head for overspeed. Big question is, what is causing this, wear on governor spring where it attachs or bushing on shaft going to carb or governor itself? Do I need to remove the engine front timing cover to correct this or just pull the distributor with the governor? I have IT manual and also D 17 parts manual that shows parts. Been into other tractors before just not the Allis.

 

[DrAllis]

Governor problems are generally pretty simple. So, let's do some quick diagnosis and decide what to do. With the engine OFF, set the throttle at about 1/2 open. Walk around to the left side of the engine and grab the vertical governor arm (behind the alternator) and push that arm forward against the internal governor spring. Release that vertical arm and it should spring back to the rear. Do this back and forth testing several times making sure there is no binding or any catching of the linkage. Pay special attention to the cotter pin at the carburetor end that it isn't getting in the way of free linkage movement. If that governor linkage all seems fine, now remove the cotter pin at the vertical arm end of the link rod. Pull the link rod out of the vertical governor arm. The arm will probably move to the rear a bit ?? If so, bend the carburetor link rod down in the middle to shorten it. Ideally, you want the link rod to just slide right back into the hole it belongs in on the vertical governor arm at a correct length. Correct this link rod length before doing anything else. A drop of oil on both ends of the link rod is a good idea. Operate the tractor to see if things are improved or not. The length of the link rod better not be more than 1/4" too long or there may be something wrong inside the governor itself. To work on the governor itself, remove the distributor cap and spark plug wires first. Pay attention to where the rotor tip is pointing. Turn the engine to get the rotor tip pointing somewhere out towards you. Mark the distributor body with a marking pen exactly where the rotor tip is located. Now, remove the governor and distributor as one and replace them as one with the rotor tip lined up EXACTLY with your mark and the ignition will be in time. So, while the governor is apart, inspect for broken governor weights or badly worn pivot pin holes. Check the forks tapered pin the be sure the fork is tight on the cross shaft. Report back as to what you have found.