impact wrench has loss of pressure during use

I bought an impact wrench, and love it. However, I have a 50 gallon Sears compressor, about 5 yrs old, and before the wrench, I never had problems with it. I drain it regularly (correct, there's no moisture filter on it).

At first the hammer worked great, but last summer it seemed to lose power. I maxed the pressure outlet, but this didn't help.

Exactly what happens. I put the wrench on lug nut # 1, and it comes off just fine... so do numbers 2 and 3. But on 4 the hammer loses torque, then it just stops. If I let the wrench sit for a few minutes it gets a little bit of oomph back, but not enough to loosen a lug nut.

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Jan 21, 2014
by: Edward

Thanks for the comeback(s)... the air impact wrench is new... it's cheap (Chinese) but I bought it because I was having the same problem with a PREVIOUS wrench. It sounds like I need to lube the regulator from what I've read. I haven't a clue how to do that. Originally I had set my output psi to 90, and I changed it to 110, then back, with the same results.
What is the CFM output of your air compressor at 90 PSI, and, what is the demand of your impact wrench in CFM at it's minimum operating pressure?

If the latter exceeds the former, you have a supply problem.

If you are not comfortable disassembling and reassembling the regulator, a new on is not a huge investment, though I suspect it's not the regulator that is the problem.


Jan 21, 2014
by: Doug in

Tool oil.
Not engine or compressor oil.
And set your regulator to 90PSI max, or whatever the tool says.

If that doesn't do it, check your regulated pressure right after the wrench quits. If you have pressure in the tank, but not after the regulator, then the regulator is not right. You can try oiling that, too. If it's still not giving you what it's set to, and the tank is at least 5PSI higher, then you need a new regulator.

Jan 21, 2014
Try this
by: Anonymous

Put a little Air tool oil 4 drops in the quick connect on the gun, nit sound like the moisture in the compressor has slowly caused a little rust in the gun and the o-rings also need lubrication. Have you had this problem with the same gun before? Sound like you don't have enough CFM at the correct PSI. You probably need 100psi @ 9-10 cfm at a minimum.

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nail gun difficulty

by rob payne
(King City, Ontario)

my nail gun on my Bostitch air compressor will not shoot out the nail. Air is the only thing that is discharged.
Hi Rob... the issue doesn't appear to be with the air compressor, but rather, the nail gun.

Are you sure you are getting the pressure to the gun that it needs? What is the tank pressure, and what is the pressure setting on the regulator that controls the pressure going to the nail gun?

If the pressure is too low, or the flow is insufficient, that might account for the nail gun not cycling properly.

However, if there are nails in the magazine, and the action of the nail gun cycles when you pull the trigger, and there is sufficient air pressure and flow coming down the air line, then your gun is the issue, not the compressor.


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Nail gun not working - the nails stick half way out from the wood

by Peter

When I used my Central Pneumatic Air Compressor. I went to stick nails in to the wood floor that we are fixing at my house. But for some reason it wont put the nail through the wood on the floor. The nails stick half way out from the wood. Also we get alot of air in the back of the air compressor. So we might be loosing air from that, how do we fix it so air dont come out of the back were we hit the compressor so the nail goes in the wood?
What is the recommended operating pressure for your nail gun? What is the pressure on the regulator setting on your air compressor?

What size nails are recommended for your nail gun and what size nails are you using?

Where is the air coming from... you say out the back of the air compressor. Since I cannot see your air compressor, you need to be much more specific.


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Can you use an air compressor to remove paint or is there a sandblaster attachment?

by janet
(austin, tx)

Just got a new air compressor, one home project is to remove paint from a metal stair railing.

Is there a method or an attachment for the air compressor such as a sand blaster?

You can (as I have done) picked up a fairly low cost sand blaster attachment for my home compressor.

Along with the sandblast kit I also purchased a bag of crushed glass "sand" as the media I would use to blast paint. It wasn't much more than just the clean, dry sand, and the source is used bottles, so I felt good about re-using a recycled product.

You will not want to use this type of equipment indoors.

Even if you are using it outdoors, a breathing mask is recommended, and protective goggles for the eyes are an absolute must.

As I expected, with my small compressor, I was only able to blast for a few seconds before the compressor had to kick in to rebuild the air pressure.

I dialed the regulator down to lower the air pressure to try to extend the air, but found that under 90 PSI the sand blast wasn't as effective in removing paint, at least for my blaster.

I used a lot of the blast media, and it did a good job removing paint from aluminum, but it was quite slow. And again, I had to keep waiting for my small, DIY type air compressor, to catch up.

The upshot of this experience is that I would use my sand blast kit to remove paint and clean small parts at home, but if I had a big job to do, and it required sand blasting, I'd take the job to the pros.

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Jan 23, 2014
by: Doug in

You might find a needle scaler useful for tight spots, assuming you go with some kind of grinder for the majority of open space on the railing.

Jan 19, 2008
Not recommended indoors
by: JimG

No. I don't think that using compressed air to strip paint is a good idea.

Not one that would work properly anyway, and never indoors.

Use a wire brush and muscle power.

Dec 09, 2007
Compressor to remove paint
by: Bill - Publisher

Janet, nice to hear from you.

Congrats on your new air compressor. There's lots of info on this site about compressors. Help yourself.

To strip paint from a railing using compressed air, you have a number of options.

There are a variety of air driven grinders (tiny through to really large) that will do an able job, as long as you're careful not to strip metal too.

An air drill with a sanding disc attachment will provide air powered sanding of the railing, but won't do too great a job in tough to get at areas.

Yes, you can purchase a compressed air powered sand blaster that will do the job as well. Concerns about the sand blaster are: does your compressor have the flow (CFM) to adequately provide the air for a sand blaster, and the process generates air borne dust which is both a concern for your health and the cleanliness of the environment in which you are blasting.

How big is the railing? What horsepower is your compressor? Where do you want to perform the work? (Inside the house or in a garage or workshop).

These questions need to be answered to help best determine what tool to use.

When you are selecting your tool, ask what CFM it needs and at what pressure that flow is required in PSI.

Your compressor came with information as to what flow it will provide, and see if it has the capacity needed for the tool.

You can try and see what tools are there for your application.

Good luck and thanks for visiting.

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