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Tool Talk Discussion Forum

School me on air impact wrenches

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atlarge54

09-16-2020 09:54:23




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I've got a 1/2" Craftsman pneumatic impact wrench mod. 875.19984. It kinda gave up on me the other day, sometimes wants to spin but not very well but frequently not at all. I've always oiled it when I use it and it never sees extended use.

Past experience tells me Craftsman parts are pretty easy to look up, I'll try that later. What I'd like to know is what typically goes bad in an impact wrench and who has done repairs on one or are the usually a throw away item?

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45cole

09-19-2020 14:44:51




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 Re: School me on air impact wrenches in reply to atlarge54, 09-16-2020 09:54:23  
I'd go to the pawn shop or ebay and buy an IR 231. Good 1/2" impact that has tons of parts availability/power. Usually ~$45.

I don't run oil through mine anymore after seeing so many gunked up. I use a couple drops oil and a couple drops Marvel Mystery air tool oil.
To clean out your gun, if it's gunked up, I'd spray carb cleaner in it and then run it, spray, reverse run it, spray, run it, ect. That gunked oil stand no chance on carb cleaner. When done just oil with a mix of turbine oil and MMO air oil. Been keeping my stuff going.

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Mule Meat

09-18-2020 19:50:44




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 Re: School me on air impact wrenches in reply to atlarge54, 09-16-2020 09:54:23  
Most likely the Rotor vanes/blades are worn or dirty. Either condition can cause the rotor not to turn from not having a good seal.



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ztrmowers

09-18-2020 06:59:35




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 Re: School me on air impact wrenches in reply to atlarge54, 09-16-2020 09:54:23  
spray insome good penetrate oil in the air inlet bet you back in business



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mark1955

09-17-2020 11:32:42




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 Re: School me on air impact wrenches in reply to atlarge54, 09-16-2020 09:54:23  
when I retired , I had a small accumulation of air tools, my impact wrench's, were high powered (or could pull at least 1000 lb.) . they were not cheap, you could take your air guns to the tool truck, to get them rebuilt. now you can go buy harbor freight guns fairly reasonable, if you ever use a good air impact gun, you wont want any other kind. mark55



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504

09-16-2020 19:49:57




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 Re: School me on air impact wrenches in reply to atlarge54, 09-16-2020 09:54:23  
We used to get 3 years from the Ingersoll Rand 231 extended,then we had them rebuilt. If we got one more year we did good. The money never worked out,just buy a new gun. I should add we ran a 6 bay under car shop,we worked them hard six days a week.



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atlarge54

09-16-2020 19:08:20




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 Re: School me on air impact wrenches in reply to atlarge54, 09-16-2020 09:54:23  
Had it apart a couple times to clean and lube and it was hit and miss. Sometimes it would work but seemed to drag a bit. Sitting watching the idiot box tonight it dawned on me that maybe the barrel/piston was in a bind. Loosened the screws slightly to release some pressure and it works just fine. Maybe the gaskets have degraded over time which caused the barrel/piston to bind?



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M-MAN

09-16-2020 18:44:11




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 Re: School me on air impact wrenches in reply to atlarge54, 09-16-2020 09:54:23  
Most of the time just pouring a little automatic transmission fluid in there will clean it up and it will work fine.



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FastFarmall

09-16-2020 14:51:35




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 Re: School me on air impact wrenches in reply to atlarge54, 09-16-2020 09:54:23  
My silver dog got tired too,the repair shop said it wasn't worth fixing, so i reluctanly bought a new Chicago Pneumatic. That was a good investment,it 1/3 the size of the old one and got way more power, and i could get under the digger shovels too, but don't farm anymore, and much easier to get under the mower deck!



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sdmike

09-16-2020 13:37:51




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 Re: School me on air impact wrenches in reply to atlarge54, 09-16-2020 09:54:23  
AtLarge, try here for parts. I am not affiliated in any way shape or form. Even if the part is NLA, I use the parts diagrams/part numbers to get what I need. Good Luck.

Mike



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Steve@Advance

09-16-2020 10:52:44




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 Re: School me on air impact wrenches in reply to atlarge54, 09-16-2020 09:54:23  
Try running some solvent through it. Drip it in the air coupler, spin it through, then follow with light oil.

If that doesn't do it, ease it apart, clean the rotor, vanes, and inner housing. They get gummed up and the vanes stick in the rotor instead of slinging out and sealing.



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TimV

09-16-2020 10:30:01




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 Re: School me on air impact wrenches in reply to atlarge54, 09-16-2020 09:54:23  
As mentioned, the battery powered impacts have made air impacts much less desirable for many people, but if you've already got this one and it does what you want when it's working, you can try picking up a can of PB Blaster's Air Tool Conditioner. It's my go-to for air tools that are getting a bit sticky and I've bought a number of "broken" tools I got for free from people who were going to toss them back to working order with it. Spray it in the inlet, let it set a few minutes, and work the trigger and other mechanisms (forward/reverse switch, power setting dial if so equipped, etc.), spin the anvil by hand while not holding the trigger, etc. etc. and it will often free things up. Link below is for a case of it on Amazon, just so you can see the product--it's available at many hardware stores, auto parts stores and similar places also. Under 10 bucks and works well as an everyday air tool oil also.

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Patsdeere

09-16-2020 10:28:22




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 Re: School me on air impact wrenches in reply to atlarge54, 09-16-2020 09:54:23  
Might want to run some air tool cleaner through it. Build up of oil over the years can create excess oil that gets gunky. Even if you have to open it up, might simply need a good cleaning.



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atlarge54

09-16-2020 10:17:20




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 Re: School me on air impact wrenches in reply to atlarge54, 09-16-2020 09:54:23  
Did a parts search and most parts are NLA.



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Charlie M

09-16-2020 15:01:51




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 Re: School me on air impact wrenches in reply to atlarge54, 09-16-2020 10:17:20  
Practically anything from more than a few years ago labeled Craftsman longer has any parts listed. I have a lot of Craftsman wood working tools from the 80's and almost everything comes up as not available. Even if the part is listed under another manufacturer Craftsman has made no effort to cross reference to it.



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MSM

09-16-2020 10:08:28




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 Re: School me on air impact wrenches in reply to atlarge54, 09-16-2020 09:54:23  
With the advent of the good battery powered inpacts, a 1/2 drive air impact is just a dinosor. Only air impact I would use is a heavy 3/4 or 1" some of the Milwaukee fuels have the power of a medium duty 3/4 air impact



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Goose

09-16-2020 12:10:31




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 Re: School me on air impact wrenches in reply to MSM, 09-16-2020 10:08:28  
I agree.

I bought a Ryobi 1/2" cordless impact wrench last winter. I haven't used an air impact wrench since.



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