This usually occurs when the check seal is out of place or bent driver or driver is too loose /too tight in the cylinder. The check band is usually the problem. Remove the cylinder and make sure that the black rubber band is covering a series of holes about mid section of the cylinder. If the band is in place, then problem is piston driver is bent , too loose /tight in the cylinder. Good luck with the repair.
SOURCE: BNA125A Porter and Cable brad nailer
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.
SOURCE: Bostitch nail gun loss of pressure, won't fire nail
Hello. I can help you. The nail gun you have uses 18 gauge brads. I would use only original Bostitch 18 gauge.
The one MM of difference you mention is the reason why you do not have the pressure you did have. Get rid of those 31MM brads and get the 18 gauge. Home Depot carries the Bostitch line. I would go there or to homedepot.com
SOURCE: Porter Cable 2 inch brad nailer piston does not return
Hi,
Sounds like the cylinder check seal. That`s the o`ring on the outside of the cylinder sleeve. With little holes in the groove. You have to remove cylinder sleeve to get to it.
Thanks,
Jeff
SOURCE: porter cable brad nailer only fires brad on second trigger pull
The dent in the wood is not caused by the air. It's caused by the set that drives the brad. Are you oiling it consistenly? Are the brads the right manufacturer for your porter cable brad nailer? From the information you give it appears that the brads are not advancing correctly or that the air pressure is not sufficient to dislodge the brad from the brad strip on the first strike - it takes an additional strike to break it free. The standard for adding oil is to add ten drops of air tool oil for every hour of operation. That seems like a lot, but the correct amount of oil is a sure way to prevent most air tool problems.
Testimonial: "Thanks for the info. I was not oiling it at that rate. Is there anything I can do to fix the issue now that I didn't prevent it?"
SOURCE: looking to buy a manual for a porter cable nail
Go to Dewaltservicenet.com and type in your model number the manual is 13 pages long. If I have helped you with your request would you please rate this response accordingly. Thank you
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