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Allis Chalmers Discussion Forum

Allis Chalmers D-17 Throttle/Governor

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02-12-2021 13:52:05

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Hi all, so after a governor weight came free and chewed up the timing gears I've got my D-17 back together and running, but the throttle is all out of whack. It idles way too fast almost close to wide open, and the throttle lever has only about half an inch of movement to wide open. It looks like the linkage is hardly moving after the governor so it seems like the problem is in there, anything I should be looking for when I take it apart again? Thanks

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02-18-2021 16:23:40

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 Re: Allis Chalmers D-17 Throttle/Governor in reply to aaronknodel, 02-12-2021 13:52:05  
Shorten (bend) the link rod like I said to do and try it !!! 1/4" too long makes a HUGE difference how the governor works.

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02-18-2021 13:07:41

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 Re: Allis Chalmers D-17 Throttle/Governor in reply to aaronknodel, 02-12-2021 13:52:05  
Thanks for the quick response! So I can confirm that the governor assembly sliding sleeve is put in correctly. To your second point the vertical arm does move forward against spring pressure about and inch and spring back. To your third point, when I remove the carb link the vertical arm does move back a little, (towards the rear of the tractor). However I'm not sure that the carb link is the issue, I am thinking it may be the horizontal shaft in the timing case. The reason I think this is when the vertical arm is free from the carb link I can see the little forked piece (which makes contact with the thrust bearing on the governor shaft) move back and forth when I move the hand throttle up and down, however when I re-attach the carb link and the vertical arm, this forked piece barely moves a quarter inch, am I correct in assuming this shouldn't be the case? It's clearly not engaging the way it should be.

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02-12-2021 15:48:50

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 Re: Allis Chalmers D-17 Throttle/Governor in reply to aaronknodel, 02-12-2021 13:52:05  
Are you absolutely sure you have the sliding sleeve on the governor assembly installed correctly?? The ball bearing goes towards the radiator. The largest diameter goes towards the rear. Until you KNOW that this correct, nothing else matters at this point. With the engine OFF and hand throttle half-way down, you should be able to grab the vertical governor arm behind the generator and move it forward (against spring force) and let go of it and it should spring backwards. Total movement is just an inch or so. If this is free to move, then the next step is synchronizing the governor to the carburetor. Leave the hand throttle half-open. Remove the cotter pin at the top of the vertical governor arm. Pull out the carb link rod. The governor arm should not move rearwards one bit. If it does move rearward, bend the link rod down in the middle to shorten it. Make it so it will just slide back into the arm hole. Now, when you place the hand throttle clear UP, the carb throttle shaft should be clear shut against the adjustable idle speed screw, so the engine will idle. If this is OK, fire it up and see what you've got.

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