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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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  • Air Tools & ... Master
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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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