Drag Torque

Anonymous-0 · Jun 12, 2014

I am replacing the seals in my Farmall Cub final drives and my repair manual states that when reassembling the rear axle that " a Drag Torque of 10 to 20 inch lbs is necessary to rotate the rear axle assembly." How is it measured? Is this necessary for a tractor that is used less than 100 hours/year and is never driven in high gear?

Thanks

JMS/.MN · Jun 12, 2014

Just guessing here, but I"d picture a fixture that fits over the wheel studs, with a centered square hole to put a torque wrench in. Or weld a nut in the center, use torque wrench and socket.

Bob M · Jun 12, 2014

10 - 20 inch lbs is NOT much! (20 in-lb = 1.6 ft-lb......far too little to be measured with normal torque wrench.)

Drag torque however can be measured like this: Wrap the axle shaft with several turns of light cord. Attach a fisherman's scale or similar to the free end of the cord. Now pull on the scale and note the scale reading when the shaft starts to turn.

A bit of math will calculate the drag torque: Scale reading X axle diameter / 2 = drag torque.

(Scale reading must be in lbs; axle diameter in inches)

ASEguy · Jun 13, 2014

In automotive that is referred to as turning torque as opposed to breakaway torque. We use a dial type inch pound torque wrench.

jr1983 · Jun 19, 2014

No bob m is correct. I am a certified diesel mechanic and that is the procedure I was taught in school. Course that was twelve years ago.

Drag Torque

Anonymous-0

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JMS/.MN

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Bob M

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ASEguy

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jr1983

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