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post #1 of 39 Old 05-16-2019, 10:43 PM Thread Starter
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Impact wrench size advice

Hi All.
So looking at getting a impact wrench to help remove shoes off the 8 ton digger. Guess they are about a 3/4" bolt.

Here is maybe my problem. My property is totally off grid. I dont use a lot of power so only have a 3000w inverter (5000w peak) So not sure I will be able to run a very big compressor. Would prefer to go battery if I could but they only seem to have a fraction of the impact force.

How big a impact wrench do you think I would need on those bolts?
Cheers
Mark
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post #2 of 39 Old 05-16-2019, 11:24 PM
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Re: Impact wrench size advice

DEWALT DCF897B 20v MAX XR High Torque 3/4" Impact Wrench

Handiest tool I've ever owned.
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post #3 of 39 Old 05-17-2019, 12:18 AM
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Re: Impact wrench size advice

Or get a gas-powered compressor...
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post #4 of 39 Old 05-17-2019, 01:34 AM
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Re: Impact wrench size advice

Quote:
Originally Posted by Flatires View Post
DEWALT DCF897B 20v MAX XR High Torque 3/4" Impact Wrench

Handiest tool I've ever owned.
I'll second that>> you have to be careful it will shear off lug nuts
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post #5 of 39 Old 05-17-2019, 02:39 AM Thread Starter
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Re: Impact wrench size advice

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Originally Posted by paul kellam View Post
I'll second that>> you have to be careful it will shear off lug nuts
Sounds like the thing. Little on the expensive side. Guess you get what you pay for.

How big a bolt would it shear off ?

Cheers
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post #6 of 39 Old 05-17-2019, 09:59 AM
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Re: Impact wrench size advice

I try not to shear things off.

How big - Depends on the steel (grade) of the bolt.

There are a lot of factors that go into bolt loading and failure. Fastenal has a good online load calculator.

It will put up 1200 in-lbs of torque.
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post #7 of 39 Old 05-17-2019, 12:43 PM
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Re: Impact wrench size advice

Rough guide is you want an impact with a drive that is equal too or larger than the biggest bolt you'll be working on...3/4" bolts,I'd get a 3/4" impact gun..

They sell electric impact guns,not sure if they make one larger than 1/2" though..
They probably do,but one may draw more amps than your inverter can handle ,maybe not..if that is an issue,maybe a 3/4" breaker bar and a long hunk of pipe for a cheater handle will work for you..sometimes you must break things free "manually" first before an impact gun will loosen things !..


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post #8 of 39 Old 05-17-2019, 02:44 PM
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Re: Impact wrench size advice

It is my go-to tool for removing rusted bolts/nuts and for taking flywheel nuts off as well as deck blades and bumper bolts
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post #9 of 39 Old 05-17-2019, 02:57 PM
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A good breaker bar combined with a half inch cordless impact.

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post #10 of 39 Old 05-17-2019, 03:07 PM
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Re: Impact wrench size advice

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Originally Posted by Country1966? View Post
A good breaker bar combined with a half inch cordless impact.
How does that work?

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post #11 of 39 Old 05-29-2019, 08:11 AM
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Re: Impact wrench size advice

You can get away with a small air compressor for intermittent use with a large impact gun. Just make sure the regulator and hose is sized appropriately. I'm not knocking cordless guns but just providing another solution. I gather you are not located where most of us are in North America where it practically rains cordless tools.
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post #12 of 39 Old 05-29-2019, 08:38 AM
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Re: Impact wrench size advice

I've been wanting this one for a while but I'm to cheap to pull the trigger:

https://www.amazon.com/dp/B01CA04RH4...3DRQO69I&psc=0

740 foot pounds, 1/2 inch drive. I've always found Makita to be tough as nails and fairly priced...
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post #13 of 39 Old 05-29-2019, 08:57 AM
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Re: Impact wrench size advice

First thing I would do is spray the offending bolt with penetrating solution (Kroil, wd40, liquid wrench or 50/50 mix of ATF and acetone)..bang at it a little to get the penetrant into it and help break free the rust.. ...repeat over the course of a few days..after a few applications, hit it with some heat and try it with a breaker bar.....if it is a 3/4 inch bolt...what size is the head on it?.......I think if your compressor gets up to 150PSI ...and a lot of 120V units do that....it should drive the impact gun sufficiently to break the bolt free....is it a bolt that is screwed directly into a threaded piece...or does the bolt extend through the piece with a nut on the other end?
If it protrudes all the way, oil up the extended piece that goes past the nut to ease the rest of the unscrewing
If you are going to reuse them throw them in some engine oil, even used oil, while you are doing your other work and coat them with some anti seize compound before reassembly so they come off easier the next time...good luck....let us know how it goes

Last edited by MARK (LI); 05-29-2019 at 09:03 AM.
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post #14 of 39 Old 05-29-2019, 09:21 AM
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Re: Impact wrench size advice

What's the torque spec for the fasteners you're trying to remove? You'll need something with at least that much power, plus enough to overcome resistance from corrosion.

I've used a 3/4 breaker bar with a 6-foot iron pipe to remove hubs (not lugs) from my Explorer, which have a spec in the neighborhood of 200-ftlb. Awkward, but effective. Surprising how much effort it took even with the long pipe.

I now have a HF electric (wired) impact gun. I don't think it would have touched those hubs.

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post #15 of 39 Old 05-29-2019, 11:21 AM
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Re: Impact wrench size advice

If you are only dealing with one size of bolt, a hammer wrench and a 6 lb sledge cut down for one handed use will work just fine. No electricity, no battery, and no compressed air needed, but it does help to eat your Wheaties.



Hammer wrenches are forged and not inexpensive, but you can whale away on one all day long with a 12 lb hammer and use it again tomorrow.

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