Question about Craftsman 1/2" Impact Wrench

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I get no movement on the socket just air blowing out of the bottom of the gun

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The air motor is probably shot. Turn the socket a few revolutions by hand, and see if it frees up and starts working. A couple of firm raps on the workbench might help. Otherwise take it apart and see whats up. You'll probably find worn vanes or a vane stuck in the rotor. There will be several vanes, and they must slide in and out of the rotor easily. If you arte lucky you'll just have to clean out, lubricate, and reassemble.

Posted on Dec 16, 2009

  • buyandsellma Oct 02, 2010

    Could also be broken hammer parts. This is common on the model #875198640

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6ya6ya
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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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1 Answer

Nailer wont advance the nails then it shoots blank


Try ez test to check for proper operation. Remove nails and air supply, point nose of gun up then down again. The driver should not move from the top of cylinder position. If driver is moving up then down replace the driver oring. If driver oring seems ok then connect air supply and bump fire the nailer without nails against soft wood and door open so that you can see the driver and feeder moving. Bump fire the gun and make sure that the driver is moving all the way back up to top of cylinder and the feeder is moving rapidly back and forward. If movement seems ok then hold the nose down on soft wood and depress and hold the trigger. This will fire the gun but driver will stay at the bottom position and not return until you release the trigger or lift the gun. When holding the gun with the driver down position, no air should leak out the top or bottom of the gun. If air leaks out bottom, replace lower bumper, if air leaks out the top replace the upper bumper. Good luck

Mar 19, 2015 | Porter Cable Coil Roofing Nailer

1 Answer

When the trigger is pulled air blows out a vent at the bottom and the anvil doesn't rotate.


If debris enter the gun, over time the vanes will not move into proper positon and react to air-flow. Vanes can become stuck if stored for long period of time. Pour small amount of diesel fuel into the gun and activate the trigger. The fuel should come out clean, if however black gunk comes out, keep adding fuel until gun is clean. Eventually all the the debris will be washed out and restore function. Good luck

May 31, 2011 | Chicago Pneumatic 1/2" Air Impact Wrench

1 Answer

When i squeeze the trigger the gun goes off but no nail comes out? i have already bought the repair kit and have been working on this gun all day


Here are a few tests for you to try. You will need a piece of rubber or coiled up old hose.
First open side door and remove nails. Tilt gun head down then up again to check if piston is loose in the cylinder. The piston should stay in top position. If piston drops to bottom of cylinder replace piston oring or apply some coils of teflon tape under oring to expand oring slightly untill piston stays at top but still can be pushed down cylinder. If piston stays at top connect air to gun and with side door open contact gun to rubber firing gun noticing the feeder movement. With very rapid firing of the gun, the feeder should move back and fourth just as fast as the driver moves. If the feeder seems to move slower than the driver moves then check/replace spring in feeder. If spring seems strong enough in your opinion then problem is restriction in the air supply to feeder. You will need to remove the two 6m allen screws at front of gun and split gun apart to check restriction at the oring sealing these two parts. Sometimes debris traped at oring (white oring) will restrict air to feeder. Good luck.

Jan 08, 2011 | Stanley Factory Reconditioned Bostitch...

1 Answer

Airblowing out bottom of nailer thanks for your help


Air blowing out bottom of nailer indicates problem with cylinder seal and/or cylinder spacer orings. Remove head and check seal at cylinder; if seal is broken or loose, replace with new. If seal is good, pull cylinder and check oring that contacts body of gun and oring between cylinder and spacer. Make sure body of gun is not scratched (sand with 400 grit paper if necessary). Parts are at www.toolpartsdirect.com. Good holidays

Dec 10, 2010 | Stanley Bostitch Coil Framing Nailer

1 Answer

When i plug the air line into the gun hitachi nv75 coil gun . the gun does not even shoot a nail. i replaced all the rubber seals in the gun and the 2 little ones in the plastic coil basket


You did not described if there is piston movement when you squeeze the trigger or push outlet into the material. If there is piston movement but it is too weak to push the nail, insufficient air supply is first obvious reason.

Eliminate insufficient air pressure or volume supplied to the piece. Air pressure supplied should be between 70psi to 120psi (4.9bar to 8.3bar), air hose should be at least 7mm internal diameter.

If air supply was eliminated, disconnect air supply and check if piston is not locket in one position, you described that you done some maintenance on the machine. I assume therefore that you will know how to check piston for movement, if there is some restrain, you need to find what is causing it and remove obstruction.

As you put gun together, do not forget to lightly oil all assembly surfaces with compressor oil.

This is very good gun and should serve you for many years to come, we use these for last about 8 years rather haevily without any problem (except aprentices...), hope you will have as good service from yours.

Please send note what was the reason, and how did you solved it.

Aug 13, 2010 | Hitachi NV75AG Coil Siding - Framing...

1 Answer

Trigger pull is not as far as older model


some models have less trigger movement than others.
at the back of the gun you have two adjusting knobs the lower one controls the trigger movement, which controls the fluid flow from the nozzle.

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2 Answers

More Air Conditioning issues!!


have 2001 ford windstar front ac blows hot but rear blows cold any idea what problem is and how to fix it?

May 27, 2009 | 2001 Ford Windstar

1 Answer

Rebuilt nail gun and now it just blows air out the exhaust port


This probably is the problem,

The cylinder that the piston moves up and down inside is probably to low, and not making contact with the rubber piece in the head cap.

The cylinder has a spring that allows for movement up and down, take a pliers and gently pull up the cylinder if it does not move freely on its own. It will stop when it reaches the cylinder plate ( the part with 2 screw holes for easy removal). Be careful not to mar the cylinder though.

When reassembling the cylinder should make contact with the head cap. Hope that works!


Apr 23, 2009 | Hitachi NV45AB2S Coil Roofing Nailer

1 Answer

Blow Gun Specs


Specifications for air blow guns include pressure capacity and air line connection type. Pressure capacity or maximum rated pressure is rated at the air inlet and measured in pounds per square inch (psi). Many types of air line connectors are available. Quick-release connectors contain fittings that are attached internally. By contrast, push-on connectors include barbed ferrules. Air blow guns use several types of national pipe thread (NPT) connectors, most of which are inch-based and female. Important NPT measurements include threads per inch (TPI) and outside diameter (OD). 1/8” NPT connectors have 27 TPI and an OD of 0.405”. 1/4” NPT connectors have 18 TPI and an OD of 0.540”. 3/8” NPT connectors also have 18 TPI, but an OD of 0.675”. 1/2” connectors have 14 TPI and an OD of 0.840”. #10-32 NPT threads are also available. Air line connections that can swivel or pivot are suitable for applications that require versatile positioning.

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