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BNA125A Porter and Cable brad nailer

When I pull the trigger it will punch the nail in but the hammer stays will not retract until I remove the air from the nailer.

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  • Snydermann Nov 24, 2008

    I have a very similar problem with a DA250B finish nailer. The driver won't retract until you fire the gun a second time.

  • Anonymous Mar 15, 2014

    How to load porter cable finishing nailer

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Both of these nailers have a check seal about half way down on the cylinder. This check seal causes the piston to retract if the piston ring is not too worn. The lower bumper should not be cracked and missing pieces, and the driver guide washer must be in place below the bumper. Also check that the driver is not bent causing it to get stuck. The da250b has an upper bumper of sorts and developes cracks that can only be seen by removing and inspecting, If cracked, the upper bumper must be replaced for proper function. The bn125a nailer probably has the discharge port clogged or upper valve parts worn or cracked. The headvalve should be inspected for cracks where the oring fits and the rubber seal should fit snug on the valve. There is a spring that pushes down in the headvalve that pushes from a rubber washer of sorts, check the diagram to be shure that all parts are in order. Both of these guns will not take too much pressure. Try adjusting to about 90 lbs max.

Posted on Nov 25, 2008

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1 Answer

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Hi I am having problems with my porter cable air nailer.. 2" brad nailer.. The hammer is not retracting far enough to hit the next nail.. I have taken it all apart and cleaned it and re oiled it but...


This is usually a sign that the hammer is slightly bent or the o-ring seal is going bad. You have to replace the hammer. If replacing the hammer doesn't work, the barrel it rides in is out of round and will need replaced. These pull out hard and you need allot of grease and patience to get them back in square to keep the seals intact.

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1 Answer

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1 Answer

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Your nailer shares design features with Milwaukee and Ridgid. All three brands experience the same issue. Lets go thru a series of simple tests to determine the problem. First and most simple test, manually load the nails and fire the gun untill miss-fire. Upon mis-fire disconnect air, open latch and check if the driver is all the way up into the cylinder or is partially down blocking next nail. If driver is down blocking next nail, replace the driver oring and retest. If driver is up all the way, remove nails, reconnect airline, leave latch open and fire gun against rubber (old tire or coiled up waterhose/airhose) this time holding the gun down and keeping the trigger depressed. In this position, the driver will remain down and feeder will remain retracted. With feeder retracted and screwdriver in hand carefully check the spring tension on the feeder (should be rather firm tension on spring and the feeder must retract with good force). If no tension or weak, replace feed spring. When you finally release the trigger, the driver will retract and the feeder should return with good force. If feeder does not return with force, replace orings and spring behind feed piston. If all tests are ok, remove head, check lower bumper in gun for cracks or missing pieces. Replace as necessary. Lube all orings with silicone lube available at Lowes in the plumbing department. (Danco brand) Good luck on your repair and email your questions.

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