problem with throttle or governor

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brichter
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problem with throttle or governor

Postby brichter » Sat Oct 03, 2020 11:45 am

All of a sudden my loboy, Mr. Jesse, will not advance with the throttle lever. Runs fine but at idle speed, when I advance the throttle nothing happens until I get to the end of the travel or wide open, then I have to hold the lever or it will come back to idle. What could cause such a condition to exist?
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Dale Finch
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Re: problem with throttle or governor

Postby Dale Finch » Sat Oct 03, 2020 1:34 pm

Make sure the lever at the governor where the throttle rod attaches is free to move. Chances are it may be frozen. If it is, spray it liberally with PB Blaster, or equivalent, and see if you can get it to move, a little bit at a time. Be gentle with that lever...it easily breaks.

This is the easiest, but not the only, possible problem.
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brichter
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Re: problem with throttle or governor

Postby brichter » Sat Oct 03, 2020 1:38 pm

I have sprayed and made sure that everything is free.
If you're gonna dream or steal, do it BIG

The best things in life aren't things.
1951 Cub
1963 Corvair
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Re: problem with throttle or governor

Postby Jim Becker » Sat Oct 03, 2020 2:06 pm

Have you closely inspected the governor spring? It may be broken or stretched.

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Re: problem with throttle or governor

Postby brichter » Sat Oct 03, 2020 4:07 pm

As far as I can tell, it seems to be fine. coils are tight and no breaks I can see.
If you're gonna dream or steal, do it BIG

The best things in life aren't things.
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Re: problem with throttle or governor

Postby Bob McCarty » Sat Oct 03, 2020 4:35 pm

Can you manually increase rpm's by moving the throttle rod/rockshaft on the carb side of the Cub?
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brichter
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Re: problem with throttle or governor

Postby brichter » Sun Oct 04, 2020 12:48 pm

yes but it is at the end of the quadrant when it revs up and I have to hold it there.
If you're gonna dream or steal, do it BIG

The best things in life aren't things.
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Glen
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Re: problem with throttle or governor

Postby Glen » Sun Oct 04, 2020 5:14 pm

Hi,
If you mean the throttle lever slips back when it is pushed ahead, the notches on the throttle quadrant, and the notch on the throttle lever could be worn, a sort of common problem.

TM Tractor has a new quadrant, it says it is a Case IH part, so you could buy it at Case IH too, I guess.
It says TM Tractor is out of the lever.
Some people build up the original parts with welding, and grind or file them back to original shapes again.

Below are pics of new parts.
The 1st pic shows how the quadrant notches should look.
The 2nd and 3rd pics from TM Tractor show how the lever notch should look.
Sometimes you can file the notches in the original quadrant with a small triangular shaped file, and improve them. :)
Attachments
1.jpg
Cub throttle lever .jpg
Cub throttle lever 3.jpg
Cub throttle lever 3.jpg (19.68 KiB) Viewed 405 times

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Re: problem with throttle or governor

Postby Crimson Tim » Mon Oct 05, 2020 1:17 am

What were the circumstances around when this started?
If it started after removing and reinstalling the carb, for example, it can throw the carb linkage out of adjustment. There’s a procedure to adjust it in the manual that is supposed to be done any time the carb is removed. It would be worth revisiting regardless.
If it changed in the middle of a run session, then something probably broke. Check all the linkages from the throttle quadrant to the governor across the rockshaft in the front and back to the carb. Look for any slop or anything else that is amiss. One possibility that comes to mind is the keyway where the front rockshaft connects to the governor commonly wallows out. Maybe your shear key there broke? Or maybe it had already been epoxied due to wear, and the epoxy just let go?
If the above doesn’t uncover anything, then I think you’re stuck opening up the governor to see what is amiss.

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Re: problem with throttle or governor

Postby inairam » Mon Oct 05, 2020 6:28 am

I have had issues with long cotter pins causes binding with respect to the carb and governor.
Last edited by inairam on Mon Oct 05, 2020 10:49 am, edited 1 time in total.
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brichter
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Re: problem with throttle or governor

Postby brichter » Mon Oct 05, 2020 9:17 am

I think Tim might have hit upon the problem. The connection where the shaft connects to the governor arm has about half a revolution of free spin. I have a spare governor and plan on just changing it out. more to come
If you're gonna dream or steal, do it BIG

The best things in life aren't things.
1951 Cub
1963 Corvair
lots more junk

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Glen
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Re: problem with throttle or governor

Postby Glen » Mon Oct 05, 2020 4:50 pm

Hi,
Below is a page from the Cub parts manual showing the governor and connections.
If you mean shaft number 30 in the pic, there is a key in the shaft, number 6.
Maybe just the key needs replacing.
To remove the shaft, remove the pin number 3, then the 2 bolts holding number 5 onto the engine, then the assembly slides out of part number 8.

http://www.farmallcub.info/manuals/cub_ ... 012-18.jpg

The key may fit tight in the keyway. :)


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