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Old 04-07-2014, 08:35 AM   #1
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Torque

Based on multiple recommendations posted here, I bought an Equal I Zer 1000/10000 WD hitch and am attempting to install it on my 2013 GMC Sierra. Problem is, manufacturer calls for 470 ft lbs of Torque on the nut on the hitch ball shank. I have called three hitch places here in Grand Rapids and they all claim that they do not have a torque wrench suitable for that application. Two said they just use an impact wrench and "crank it down real good!" How precise do I need to be in tightening this monstrous nut and is it possible to just use an impact wrench? Thanks for any help offered...
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Old 04-07-2014, 08:43 AM   #2
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I have had 3 or 4 different ball hitches over the years, from my 1 7/16 utility trailer up to my TT at 2 5/16. I have always used my biggest plumber's wrench to crank the nut down as hard as I possibly can. Have never lost a trailer <knocks on wood>

I'm not sure my impact wrench could even muster 470 ft lbs...
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Old 04-07-2014, 08:43 AM   #3
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I put the shank in the receiver sideways and I used a 3/4 inch breaker bar with a pipe slipped over the end of it and tightened it by hand then stepped on the pipe and put some body weight into it....Figured that would be enough. Have checked it often, can't get it to budge..It's tight enough..
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Old 04-07-2014, 09:10 AM   #4
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An impact wrench will not properly torque a bolt !!! And to torque to 470 lbs. you would need a big wrench.

Torque, measured in pound feet (sometimes incorrectly stated as foot pounds) is a simple formula. I weigh about 190 lbs., so if I put all of my body weight 1 ft from the axis of the wrench, that is 190 lb./ft.

Try this: Turn you hitch 1/4 turn in the receiver so you have to push down to tighten the ball nut. Take your body weight and divide by 12. With my weight at 190, that figure is 15.8. For me to torque to 470 ft./lbs., I need to put all of my weight on a point 29.5 inches from the axis of the wrench (470 divided my 15.8). I will get a metal pipe and mark it about 29"........I need to take off about 1/2" since the bar will not go all of the way to the axis of the wrench. I will then put my hand centered over the mark, put my knee on my hand, and put all my weight on that knee....a little balancing act is needed.

You will probably need a 3/4" breaker bar and appropriate socket to use this method. If calculated correctly, I betcha this method is ranks right up there with a torque wrench.
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Old 04-07-2014, 09:32 AM   #5
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Amazon.com: CDI Torque 6002LDIN 3/8-Inch Drive Memory Needle Dual Scale Torque Wrench, Torque Range 0 to 600-Inc: Home Improvement
found this goes to 600 pounds / inch but is not cheap. Would have to agree with MtnGuy about the pipe on the breaker bar but you won't be able to tell if you have gotten to your goal or exceeded it, tried to find one in 3/4 inch size but they were running around $500 minimum.
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Old 04-07-2014, 09:39 AM   #6
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Amazon.com: CDI Torque 6002LDIN 3/8-Inch Drive Memory Needle Dual Scale Torque Wrench, Torque Range 0 to 600-Inc: Home Improvement
found this goes to 600 pounds / inch but is not cheap. Would have to agree with MtnGuy about the pipe on the breaker bar but you won't be able to tell if you have gotten to your goal or exceeded it, tried to find one in 3/4 inch size but they were running around $500 minimum.
600lb/in is only 50lb/ft.

3 4" Drive 500 ft lb Dial Torque Wrench New Made in USA Utica DA4500FM | eBay
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Old 04-07-2014, 09:41 PM   #7
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Sorry read the ad wrong but the ones that did register 600 ft/lbs did have rather extreme prices for a one time use. Still think I would go with MtnGuy and use a pipe and 3/4 in breaker bar.
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Old 04-07-2014, 09:53 PM   #8
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Sorry read the ad wrong but the ones that did register 600 ft/lbs did have rather extreme prices for a one time use. Still think I would go with MtnGuy and use a pipe and 3/4 in breaker bar.
I always used a crescent wrench and a 3' -4' pc of pipe with the hitch turned sideways in the receiver. Usually either drilled and cotter pinned the nut or just tack welded the ball.
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Old 04-07-2014, 09:56 PM   #9
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Finding an affordable 17/8" thin walled deep socket to fit over the ball shank nut and a wrench to tighten it is proving to be a challenge. Guess Taking it to Terrytown Camper Service Dept and letting them tighten it for a small fee would be a more affordable option. Thanks everyone for your advice. Whew. Didn't know putting a nut on a bolt could be so complicated...
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Old 04-07-2014, 09:59 PM   #10
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I'm not sure my impact wrench could even muster 470 ft lbs...
My new 3/4 drive impact gun is about 1500 ft lbs.
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