torque

mEl · Jun 21, 2022

Looking for the recommended torque for a set of 1650 Oliver rear hub U bolts, 3 per side, 3/4 NF thread with G8 nuts and hardened washers. Thanks in advance.[/u]

MSD · Jun 21, 2022

Hope this helps. Don't over tighten them. Did that to a set one time and the more I tightened on them the looser they got till I figured out what I did to them.

mEl · Jun 22, 2022

Thanks MSD, That is what I was concerned about, I think I will take them to about 250 as that is all the torque wrench I have. The bolts I have are slightly pitted anyway. I wondered if the torque could have been different for the application than the actual chart spec.

535353m · Jun 23, 2022

Use common sense, -clean the shaft, lube the threads, use hardened washers, thick nuts and tighten by feel, - not rocket science.

Indiana Ken · Jun 23, 2022

(quoted from post at 04:52:46 06/22/22) Thanks MSD, That is what I was concerned about, I think I will take them to about 250 as that is all the torque wrench I have. The bolts I have are slightly pitted anyway. I wondered if the torque could have been different for the application than the actual chart spec.

A bolt torque chart is based on the bolt strength. Typically the torque value given will result in the bolt tensioned to 75% of it's yield strength. The 315 lb-ft value, is for a 3/4", UNF, grade 8 bolt, lightly lubricated (oil). Since you are torque wrench limited, the torque value for the same bolt well lubricated (moly-disulphide) would be 210 lb-ft. This would result in the same clamp load as for the lightly oiled bolt torqued to 315 lb-ft. In conclusion, yes the manufacturer could specify a lower torque value for a specific application; they are simply not using the full strength of the bolt.

mEl · Jun 24, 2022

Thank you all for the response, I guess I took the "its not rocket science" route in the end, I used my Mac 1/2 drive air wrench to tighten them and then checked final torque with my 250 Snap on torque wrench, Most exceeded the 250 setting so will recheck after a pull to make sure it stays.

MSD · Jun 25, 2022

Thats where I got in trouble with mine. Every time I checked them they were loose but the bolts were just stretching. Best thing I did was to get rid of the clamp on
hubs.

mEl · Jun 26, 2022

(quoted from post at 09:39:15 06/25/22) Thats where I got in trouble with mine. Every time I checked them they were loose but the bolts were just stretching. Best thing I did was to get rid of the clamp on
hubs.

I'll let you know if they stay tight, 5500 is about as heavy as we pull, will check after a couple pulls and report back.

535353m · Jun 27, 2022

several yrs ago,I was at a pull, a couple of younger guys were working on a tractor axle, hub, it was rusty, rough and uneven,
complaining the hub would move and not stay tight, they had a soup can cut and wrapped around the axle, when I told them to sand
it down smooth, the answer was, how it would ever stay tight then. LOL

mEl · Jun 27, 2022

(quoted from post at 07:29:21 06/27/22) several yrs ago,I was at a pull, a couple of younger guys were working on a tractor axle, hub, it was rusty, rough and uneven,
complaining the hub would move and not stay tight, they had a soup can cut and wrapped around the axle, when I told them to sand
it down smooth, the answer was, how it would ever stay tight then. LOL

Guess it takes all kinds !

535353m · Jun 27, 2022

several yrs ago,I was at a pull, a couple of younger guys were working on a tractor axle, hub, it was rusty, rough and uneven,
complaining the hub would move and not stay tight, they had a soup can cut and wrapped around the axle, when I told them to sand
it down smooth, the answer was, how it would ever stay tight then. LOL

torque

mEl

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mEl

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Indiana Ken

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mEl

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MSD

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mEl

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mEl

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