Sturtevant-Richmont Torque Multiplier

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Williams 2-1/2" to 1-1/2" adapter
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Belly pan & Equalizer bar from dozer
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1-1/2" drive socket
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Torque Multiplier ready to use
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Snapon L-78 1-1/2" drive ratchet
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Now Use Jet 5000 impact gun
torque multiplier
Torque multipliers stacked

The photo panel on the left shows the set up for using a large (in this case 10,000 foot pound) torque multiplier to break loose a 1 - 1/2" bolt. The Jet impact wrench is suppose to generate 3000 lbs of torque or so, but it wouldn't take these bolts out. It wasn't really a location where a slug wrench would work so I either needed to use a breaker bar and a very long handle or pull it with the tractor or find a more sophisticated solution. While Torque multipliers are best used for tightening things---because you know what torque you are going to and can stay within the limits of the multiplier-- they can also be used for taking things loose, but you have to keep in mind the limits of the equipment.

In this case, I didn't need to worry. Here I am using a 10,000 pound output multiplier with a 6:1 ratio implying that I can safely put about 1600 foot pounds of torque on the input side. Although it is a big ratchet-- the handle is only 40" long, and assuming I can pull 200 lbs on a radius of 36", this amounts to about 600 pounds---maybe some more if you bulge your eyes a little. As it turns out this was enough to take the bolts loose. They were 1-1/2" coarse threaded cap screws. If I hadn't been able to pull it this way, I could have upped the ante with an extension pipe, or I could have stacked a second multiplier on top of this one.

Suffice it to say torque multiplers this large are fairly rare. It has a 2 -1/2" drive output, and as you can see in one of bottom frames, by the time I got the bolt loose I was tired enough that I lifted the multiplier away with a crane.

In this particular case, I wasn't repairing anything, I was actually scrapping a large dozer and what you see is the front belly pan from the equalizer bar forward. IT was still too big to fit on my scrap truck as the equalizer bar is almost 10 feet long so it really needed to come apart. If you have sharp eyes you will notice that the back cap is welded down. That is because the bolts were broken off. I got that loose with a carbon arc... but that's another story---on the welding section.

The 7th frame down depicts removal of a ripper base plate bolt that is reluctant. In this case use of the 1 1/2" drive ratchet wouldn't do the job so I upped the ante by stacking the compounds. One needs to be a little careful in this as you can pretty easily overtorque even the big compound. You have reached full capacity or above with a 3/4 inch ratchet on both multipliers. Your gear ratio is about 20:1 and if you pull 500 lbs worth which is doable on a 3 1/2" handle of the the long snapon 3/4" ratchet you have really arrived at over 10,000 lbs of torque. You don't have a lot of problem telling it either. The 1 1/2" drive gets a bit rubbery and starts 'flexing' sort of like a 1/2" does with a long flexhandle when you get aggressive with it.

- - Updated 12/31/2012
- - Updated 04/19/2008
- - Updated 7/01/2007
- - Updated 03/21/2008