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governor springs

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artc
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governor springs

Postby artc » Tue Mar 20, 2007 9:19 am

i ordered a new governor spring from Madson's last fall for Pete's engine swap. when i received it i thought it looked a little heavier than the original. i tried it anyway - and removed it. it caused the motor to surge and hunt as the spring was apparantly overpowering the flyweights.

so i put the old spring back in and put it out of my mind.

ordered two springs from C & G.... thinking perhaps i just received a wrong part the first time. nope, got the same spring.

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anyone else having this problem?
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John *.?-!.* cub owner
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Postby John *.?-!.* cub owner » Tue Mar 20, 2007 11:52 am

I put a new spring, along with weights on one of my tractors and have a similar problem, if I set the throttle up with no load. Once loaded it smooths out. I assume they have discontinued the original and only sell the ones for the later models, which would be heavier to give more rpms.
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Postby George Willer » Tue Mar 20, 2007 12:31 pm

I wonder how the two springs would actually compare in strength? Of course heavier wire makes for a stiffer spring, but larger coil diameter makes for a weaker one.

To come up with a true answer by calculation is beyond my limited ability, but I imagine the difference between the two springs is less than one might think.
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Don McCombs
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Postby Don McCombs » Tue Mar 20, 2007 12:43 pm

Could you stretch each spring with the same weight and measure the before and after length? Or use something like a fish weighing scale to stretch them the same length and measure the force required for each?
Don McCombs
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Jim Becker
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Postby Jim Becker » Tue Mar 20, 2007 1:10 pm

Or hook them end to end and compare the stretch of each one.

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artc
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Tractors Owned: Restored: 1950 Cub, 1950 Cub Demo, 1948 super AI, 1935 Silver King, 1946 Oliver 60 RC, John Deere M, 1950 C demo.

In working clothes:
1950 cub, 1948 cub, 1941 A, 1948 H, 1963 B414, 1958 240U, 1947 Oliver 60 industrial, Oliver 70 industrial. IH 450, 1963, another 1948 cub, 1946 I6 with Trogan front blade.
Location: CT, Middletown
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Postby artc » Tue Mar 20, 2007 1:14 pm

using a spring scale and a bolt clamped in the vise....

new spring stretched 1/4 inch measured 16 to 17 lbs

old spring -same test - 13lbs

even allowing for spring fatique (sp), the new spring appears significantly heavier
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beaconlight
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Postby beaconlight » Tue Mar 20, 2007 4:17 pm

From all your other postings Art I believe you stretched both 1/4 inch. Are both springs the same length end of coil to end of coil? What you did is a good test. Do you have a spring from a power unit for comparison, or a low numbered lowboy? Each of those would be 2200 RPM.
As a point of interest, well off the subject, my 2003 Dodge 1500 with the small engine and stick shift is at 1800 RPM at 69 miles and hour in 5th gear.
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C-Pop
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Postby C-Pop » Tue Mar 20, 2007 6:23 pm

Governor spring data. Free length (inside of hook to inside of hook) should be one and one half inches. Test load and length should be twenty-eight and one half lbs. @ one and seven-eights inches. Hunting or unsteady running can be eliminated by the bumper spring screw which is located at front of the governor housing. Do not turn the bumper spring screw in too far as it will interfere with the low idle speed adjustment. This information was taken from the I&T shop manual.

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Postby Buzzard Wing » Tue Mar 20, 2007 7:18 pm

I noticed the spring was 'stretched' or something on the 71 so I replaced it. That does appear to be the same you got Art....
Image

But on the 50 it looked about right so I didn't replace it. Didn't look to see if there was a different gauge wire though. They are tough to remove and replace, even apart.

The bumper stop was adjusted on the 71 when setting the idle (per the book) and it runs fine as far as I can tell. I don't have enough time on the 50 to say one way or another. The service manual section on idle adjustment may help??

Larry
1971 Cub (Rufus) 1950 Cub (Cathy) 1965 Lo Boy Fast Hitch (Nameless III) 1970 Cub 1000 Loader & Fast Hitch (Lee)


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