3-Point Hitch Hitch Pin Torque

[TBone]

Thanks for the tips Ernie.

TBone

 

[RalphVa]

I believe 400 ft # is too high for that size nut. Found 185 somewhere. Recently replaced one of my lift pins and used about 210 ft #. Checked the other one. It was slightly looser than this.

 

[CalG]

Check out these suggested torque specs for 7/8" fine thread grade 5 and grade 8, plated and non-plated
350 pound feet and UP!

I weigh just shy of 200# and have a three foot cheater bar on a 3/4 drive breaker bar.

I do the best I can in the Cat II. ;-)

 

[CPTKILLER]

Safety wire or lock wire is common in aviation especially in situations with lots of vibration like with helicopters.

 

[5030]

I don't have a rotary cutter, but I've got a tiller. I tightened the hitch pin nuts as tight as I could with a 12" crescent wrench and check them periodically. They've never loosened. Maybe you could just get them as tight as you can and check them often at first. If they loosen, I wonder if some Locktite might help. I don't have much experience with this, I'm just throwing out ideas.

Not a Crescent wrench, it's an adjustable open end wrench, aka: West Virginia socket set. Crescent is the name of the tool company that designed it and using one to tighten anything that requires substantial torque is asking for trouble as in rounded off flats or a busted face when it slips off.

Go get yourself some real applicable sockets before you get injured.

 

[California]

TBone
I just looked at that link again. Those safety wire pictures are the heads of the bolts, not the nuts. I'm sorry I didn't pay closer attention to the pics. You definitely don't want to drill through the whole thing. You'd never get the holes lined up again if you removed it. Plus it wouldn't be worth wiring it then, you would just install a cotter pin. Ernie

Hey who's Anonymous Poster? 29,000 posts!

Joined in 2005, posted the above in 2002, and his prior posts said he lives in Tennessee, New York, and Florida.

Huh?

 

[Chewwy]

Hey who's Anonymous Poster? 29,000 posts!

Joined in 2005, posted the above in 2002, and his prior posts said he lives in Tennessee, New York, and Florida.

Huh?

Likely many more than one individual. I suspect in the early days of this website, anonymous posting was allowed (i.e., no login required).

Over 29,000 posts but only 9 good posts.

 

[bcp]

... a 100# woman dangling from a 4 foot piece of pipe on the handle of a wrench equals 400 ft# of torque. ... Dang cheap torque multiplier and readily available.

Is this still available?

Bruce

 

[WinterDeere]

""As far as acheiving 400 ft# of torque on a thread, a 100# woman dangling from a 4 foot piece of pipe on the handle of a wrench equals 400 ft# of torque. If you can't find a hundred pound woman, adjust the length of the pipe to your body weight. Chances are pretty slim any bolt capable of being torqued to 400ft#s will break when you are hanging on a wrench handle. Dang cheap torque multiplier and readily available. ""

On those rare occasions when I need to torque something higher than the limit of my biggest torque wrench, this is exactly how I've handled the job. You know how much you weigh, so just divide that into the required torque and now you know how long a handle you need.

But do note that what you care about is not the length of the handle or where to grip it relative to the end, but your horizontal distance from the nut. If you arrange the breaker bar or heavy ratchet horizontally, then the position at which you apply force to the handle and the horizontal distance are the same. But if the wrench is angled up at 30 degrees to the ground, then your applied torque will be low by 1 - sqr(3)/2 = 13%, by using handle length only. Use horizontal distance.

You probably remember your high school physics teacher talking about the "x-component" or "y-component" of a force vector, and this is it. Sorry if that causes PTSD for anyone.

Note: For those who don't remember 10th grade Trigonometry, the resulting torque will be W*L*cos(angle), where W is weight, L is length of handle to applied force, and angle is measured from horizontal. My sqr(3)/2 shortcut for 30 degrees stated above is just a shortcut on this, based on remembering the old 30/60/90 triangle side lengths.

 

[Tinhack]

Did you hear me slap my forehead?