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Help with i40/D12 Governor/Throttle Setup
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i40Dude View Drop Down
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Joined: 05 Sep 2024
Location: Enumclaw, WA
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    Posted: 06 Sep 2024 at 11:51am
Hi there, sorry if this post is long, I'll try to give as much info as I can to avoid confusion or questions. 

Just got done rebuilding the engine in my 1964 Allis i40 Ag/Loader tractor. Throttle/governor doesn't work correctly at all. Previous owner cobbled/bent some stuff that I have since fixed. 



This is the current throttle lever. It's been broken/rewelded before. I believe incorrectly. Where should the handle be in relation to the pin on the slider bar and which direction shoudl be idle/full throttle? Currently I've only gotten down as idle, up as full throttle to work. 



The slider bar has issues too (I know it's upside down in the pic). When the right direction, it hits the fuel tank when moved halfway forward, with the tank removed it tilts down in back, sharply up in the front when moved all the way forward. Need to know how to fix that. 



I'm assuming the rod spring goes behind the slotted tab, due to the 2 pinched stops on the rod itself. Just want to clarify that. 



Which direction should the arm attached to the rod rotate to give throttle/idle? Currently, rod pushing forward, more spring tension gives throttle. Should it be pushed forward with spring tension at idle, then slowly released to attain full throttle? 



My carburetor is of the universal style with an adjustable throttle arm. The rod I made myself, I can make a new one if need be once everything else is situated. Is the arm supposed to be pointed downward and slightly forward with a small dog leg to clear the carb body like I've seen in parts diagrams? Currently the rod pushing back is idle, rod pulling forward is full throttle. I know if the arm is upside down it reverses those directions. Should it be rod pushing back is throttle, rod pulling forward is idle? 

That's all the questions I have, huge thanks to anyone who reads the whole post and/or provides helpful insight. 

Sorry if the post is too long or in the wrong section. It is an industrial model but is an Ag industrial model so I was unsure where to post it. 
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dfwallis View Drop Down
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Joined: 09 Mar 2023
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Points: 627 		Post Options Post Options   Thanks (0) Thanks(0)   Quote dfwallis Quote  Post ReplyReply Direct Link To This Post Posted: 06 Sep 2024 at 12:02pm
Stretching the spring on the gov increases engine RPM.  So, the carb link pulling toward the front should increase RPM.

Edited by dfwallis - 06 Sep 2024 at 12:03pm
1952 CA13092
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DrAllis View Drop Down
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Engine off. Position the hand throttle so the governor spring is stretched out pretty good. 100% would be best, but 50% will work. The carburetor "universal" butterfly lever should be fully forward. Ideally, this lever should be "centered" or pretty darn close to centered in its full stroke. By this (for example) I mean it should operate from 10 o'clock to 2 o'clock, not 9 o'clock to 1 o'clock. So get that adjusted first. At that point, with the butterfly lever forward as far as it will go, the link rod length should be such that it will just slide into the governor arm hole and carb butterfly lever hole without moving either from their current position. You could at this point cheat a little with the universal lever feature to get it perfect. Can't help you with the throttle. They do work backwards (I think) forward is SLOW idle and back is FULL speed.
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Gary View Drop Down
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Points: 5376 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Gary Quote  Post ReplyReply Direct Link To This Post Posted: 07 Sep 2024 at 4:24am

Nope Dr., the other way around - not backwards - on the throttle.

On my D-12 Ser. III - Idle is rearward and down.

And very little movement for increased speed, IE 1/2 inch at the end of Lever.

Gary
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PaulB View Drop Down
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Originally posted by Gary Gary wrote:


Nope Dr., the other way around - not backwards - on the throttle.

On my D-12 Ser. III - Idle is rearward and down.

And very little movement for increased speed, IE 1/2 inch at the end of Lever.

Gary

 
Yes in the D10/12 series III, I-40 & I-400, fast is forward against the fuel tank. On the series I & II and the early Industrial D10s forward is the idle position.  
If it was fun to pull in LOW gear, I could have a John Deere.
Real pullers don't have speed limits.
If you can't make it GO... make it SHINY
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