Question about Porter Cable 2 - 1/2" 15 - Gauge Angle Nailer Kit

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DA250B air nailer leaks air, piston stays down

Nailer leaks air out of exhaust at all times. As soon as air hose is attached, piston goes down slowly. Have replaced air valve at trigger. All o-rings look ok. Not sure I have wide rubber ring with lip on correct spot on plastic cylinder OD. We have lots of water mixed in air at facility here. Thanks!

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Your nailer has a collar /vinyl seal that should be installed on the head valve and seats against the cylinder. The seal should fit very snugly on the headvalve. The plastic cylinder must not have any nicks on the surface or be out of round. The head valve has an upper bumper that needs to be inspected for cracks. To test the orings in the head for leaks do the following. Push in the headvalve with your thumb till it hits bottom then cover the small hole at the mating surface of the head with finger then release headvalve. Suction should hold the headvalve in for a moment. If no suction, replace the orings. Parts and item list are at WWW.toolpartsdirect.com . Enjoy

Posted on Dec 11, 2008

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Posted on Jan 02, 2017

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LOOKING FOR SEAL REPALCEMENT AT TOP OF PISTON


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Feb 09, 2016 | Air Tools & Compressors

2 Answers

Exhaust leaks as soon as air is attached. Driver advances and stays down under pressure even after air line is un coupled. Will not drive cleat.


The air motor needs to be rebuilt. You can try a couple of drops of air tool lube in the air inlet fitting before connecting the air hose to see if that will free it up. Otherwise it needs to be overhauled.

Feb 19, 2015 | Porta Nails PortaNails inc Portamatic 421...

1 Answer

F28WW-fire gun. piston doesn't retract back, trigger is good gun is clean & oiled what could be the problem. nailer year old


Check band # 175520 (black rubber band around the outside of the cylinder) is what causes the piston to retract. If the check band is in place, then problem could be caused by cracked lower bumper, worn piston oring or cylinder seal on the headvalve. IF the cylinder seal is bad, air will leak between seal and the top of the cylinder and could push piston down cylinder. If piston oring is too loose, the piston will not stay at the top of the cylinder. If you point the nose of the gun up then down again and the driver moves within the cylinder, replace the oring. Good luck

Apr 04, 2013 | Stanley Bostitch Stick Framing Nailer...

1 Answer

When using n60 nailer, one nail goes all the way in, but the next nail only goes halfway in and the some don't go in at all. Don't know what's wrong.


Worn orings in gun and the trigger valve can/will cause problems as you describe. Remove the nails and leave open the latch. Lighty tap the nose of the gun against coiled rubber hose. The driver/piston should stay in the top position (if the driver is down or comes down after test, replace driver oring). Now push the nose against the rubber hose and activate/hold trigger, while holding the trigger/gun in this position, the driver will /should stay down under pressure. At this point no air should leak out of the nose of the gun. If air leaks out of the nose, examine the lower bumper for cracks ( replace as needed ). Finally remove the trigger and examine the firing valve pin. If it has a plastic pin, looks worn and wobbles from side to side, most likely needs to be replaced. If however it has a metal pin and it seems to fit snugly, do not change unless it is leaking air. Good luck

Jun 19, 2011 | Stanley Bostitch Air Nailer Trigger N60...

1 Answer

What causes it to shoot a double, or triple nail sometimes?


Make sure that orings are in good shape, lower bumper not cracked, (no leaks and the driver/piston stays at the top position, if piston drops a little or all the way down with no nails in gun, replace piston oring). Also check spring tension for feeder and two check paws in the door (feeder tension should be firm ). Adjust the timing screw up or down one or two turns and test (timing screw at the top of safety foot, head of screw pushes on the firing valve ). Test for lower bumper cracked. Remove nails and leave side door open. Hold the nose of the gun against coiled air hose or thick rubber and press and hold the trigger. The piston will stay down against the bumper until you release the trigger. No air should leak out the driver path. If air leaks past driver suspect bad bumper. Test action of feeder piston. Remove side cover to feed piston and clean debris. With air disconnected, move the feed piston back and forward. There should be a little resistance, if it moves very easy, suspect orings worn. As soon as you connect the air line. the feed piston should move forward with force, note the position of the feeder. Now with air disconnected, place nails on the feeder. The first nail should be well within the path of the driver. If not fully under driver path suspect worn feeder / feeder retainer pin, or debris inside feed piston chamber preventing piston from full forward travel (debris from inside of the gun will enter the feed piston chamber usually broken bits of lower bumper). Replace parts as needed. Good luck with your repair.

May 17, 2011 | Hitachi NV45AB2 Roofing Coil Nailer

1 Answer

N12 nailer doesn't retract completly,changed all orings,trigger valve,cylinder/piston looks good and lubricated, whats wrong?


For nailer to retract properly the lower bumper should not be missing any pieces or cracked. The upper bumper should be pliable and complete. Pull the cylinder and check for a groove cut into cylinder with a series of holes. This groove should have a snug fitting oring. It should not take much force to move the piston within cylinder. If all seems good, re-assemble using silicone paste lube available at Lowes or swimming pool supply. Easy test. With air connected and nails removed, dry fire gun against coiled rubber hose. Keep holding the trigger and keep the gun against hose. The piston should stay down and no air should leak from gun while holding in this position. Lift up gun and the piston should retract. If air leaks from bottom while holding in this manner, lower bumper is not sealing, if air leaks from top, then upper bumper is allowing air to leak from head valve. Good luck

Feb 17, 2011 | Stanley Air Tools & Compressors

1 Answer

DeWalt Frame Nailer 51844 extends firing pin when air hose attach


Check whether the trigger is working properly, and whether the air valve is not leaking.

Jun 13, 2009 | Dewalt Round Head Framing Nailer D51845

1 Answer

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.

Nov 02, 2008 | Air Tools & Compressors

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