Setting high idle speed

Farmall Super A, AV, 100, 130, & 140 1939 - 1973

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Daniel H.
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Setting high idle speed

Postby Daniel H. » Mon May 22, 2017 9:06 pm

When setting the high idle speed, does the screw on top of the governor need to turn clockwise or counter-clockwise to increase the RPMS? Mine seems to be all the way out and I am still at 1440 instead of 1525.
I did make sure to adjust the rod between the governor and the carburator.
Thanks.
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Jim Becker
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Re: Setting high idle speed

Postby Jim Becker » Tue May 23, 2017 9:48 am

Counter-clockwise. Make sure your linkage from the control lever to the governor moves freely and has the full range of motion. Maybe your governor spring is weak.

Daniel H.
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Posts: 607
Joined: Mon Feb 03, 2003 1:18 pm
Zip Code: 27055
Tractors Owned: 1951 Super A
1955 Cub Lo-boy
1955 Ferguson TO-35
Circle of Safety: Y
Location: NC, Yadkinville

Re: Setting high idle speed

Postby Daniel H. » Tue May 23, 2017 10:08 pm

Thanks, Jim. I will take another look at the linkage. The spring and thrust bearing have been replaced in this tractor.
The four most expensive words in tractor restoration: "We might as well..."

Daniel H.
10+ Years
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Posts: 607
Joined: Mon Feb 03, 2003 1:18 pm
Zip Code: 27055
Tractors Owned: 1951 Super A
1955 Cub Lo-boy
1955 Ferguson TO-35
Circle of Safety: Y
Location: NC, Yadkinville

Re: Setting high idle speed

Postby Daniel H. » Thu May 25, 2017 6:50 pm

I took another look at the linkage. I have full travel with no binding. I even disconnected the linkage between the quadrant and the governor input to be sure it was all the way back. The output arm is all the way back (towards the carburetor) and the the pin lines up perfect. I am still showing 1460 RPM Max. This is with an inductive tachometer. I don't know how accurate it is. I have a contact tachometer as well that I could put against the PTO shaft. Does anyone know what the PTO shaft speed at max governed engine RPM is supposed to be?
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Jim Becker
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Re: Setting high idle speed

Postby Jim Becker » Thu May 25, 2017 11:16 pm

Load speed of the PTO is 541 rpm at engine 1400 rpm. At your max idle of 1525, the PTO should run 589 rpm.

The ratio of the PTO is 17/44.

Daniel H.
10+ Years
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Posts: 607
Joined: Mon Feb 03, 2003 1:18 pm
Zip Code: 27055
Tractors Owned: 1951 Super A
1955 Cub Lo-boy
1955 Ferguson TO-35
Circle of Safety: Y
Location: NC, Yadkinville

Re: Setting high idle speed

Postby Daniel H. » Fri May 26, 2017 7:52 am

Jim,
Do you know what change was made to the governor to allow for the 100/130/140 to turn a higher RPM?
The four most expensive words in tractor restoration: "We might as well..."

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Re: Setting high idle speed

Postby John *.?-!.* cub owner » Fri May 26, 2017 10:24 am

Remember, that screw is a limit stop, not an adjustment screw. The rest of the linkage has to be able to bring the engine up to the rpm you want.
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Jim Becker
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Re: Setting high idle speed

Postby Jim Becker » Fri May 26, 2017 12:14 pm

Daniel H. wrote:Jim,
Do you know what change was made to the governor to allow for the 100/130/140 to turn a higher RPM?

As far as I know, these models all were spec'ed for the same rpms. Some other versions of this engine used different governor springs or weights.

Daniel H.
10+ Years
10+ Years
Posts: 607
Joined: Mon Feb 03, 2003 1:18 pm
Zip Code: 27055
Tractors Owned: 1951 Super A
1955 Cub Lo-boy
1955 Ferguson TO-35
Circle of Safety: Y
Location: NC, Yadkinville

Re: Setting high idle speed

Postby Daniel H. » Fri May 26, 2017 8:03 pm

Jim Becker wrote:
Daniel H. wrote:Jim,
Do you know what change was made to the governor to allow for the 100/130/140 to turn a higher RPM?

As far as I know, these models all were spec'ed for the same rpms. Some other versions of this engine used different governor springs or weights.


Yes, I was looking at the "C" and Super C data in the I&T Manual. They were 1875 RPM. I assumed since they up-sized the 113 to 123 CI in the offset tractors, they upped the RPMs as well. Assuming can be dangerous.
The four most expensive words in tractor restoration: "We might as well..."

Jim Becker
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Re: Setting high idle speed

Postby Jim Becker » Fri May 26, 2017 9:49 pm

The C and Super C used a different spring.


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