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Farmall & IHC Tractors Discussion Forum
:

smta cam gear any torque requirements on nut?

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Kevin

04-28-2004 15:45:57




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Just wondering if there is any torque requirements for the cam nut on the end of the cam gear. I just put a over bore kit in my tractor and started it with a used cam gear and the cam gear exploded after two minutes of running. I put the old one in now which is the original with some small chips on the outside of the gear (because I pried on it abit) and i have no play in between the cam and crank gear. Is that ok?

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Bob M

04-28-2004 18:18:02




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 Re: smta cam gear any torque requirements on nut? in reply to Kevin, 04-28-2004 15:45:57  
Kevin - I was never able to find a torque spec for the cam nut. Also because it's not a standard nut (thin pattern, fine thread), a standard threaded fastner torque table will specify more torque than the threads are good for.

Anyway when I did my SM I torqued it to about 70 ft-lb. (It must be OK because it's been working fine for several years now.) Make sure the nut keeper is in good shape, it's tang is fully engaged into the keyway and the ears over at least 2 nut flats.

I wouldn't worry about a few chipped gear teeth. When the nut unscrewed off mine it fell into the gears and took pieces out of several teeth on every one but the governor gear. But it still runs fine.

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