Question about Stanley Bostitch F21PL Nailer

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Air leaking out of trigger and drive pin wont recoil it will shoot one nail then drive pin wont go back you have to unhook airline and manually push pin back.

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  • 256 Answers

To fix this problem you will have to disassemble the gun to get at the trigger area. Look for a broken "O"-ring. This is probably jamming the recoil of the drive pin.

Posted on Jun 04, 2009

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Posted on Jan 02, 2017

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Replaced all the o'rings and bought dewalt nails but its still not shooting the nails what can I do now?


first of all, you thought it was the orings? why? does it nake any noise( air leaking). make sure, positive, the safety his making contact with the trigger. It goes from the top all the way and makes contact on the bostitch nailers on the back side of the trigger and if its not set allthe way it wont fire. as a repair guy I have found a few to be more odd then others. if you feel comfortable enough to change orings , Ill assume you have had it apart. then take off the magazine an tap out the pin that holds the trigger in, not the valve just the trigger. this way you can bypass the safety and dignose the issue. when you get he trigger out push the button with your finger and air plugged in don't face it toward yourself or have anything over the end. Even with no nails it still hurts a lot when the driver hits you. Trust me on that.
If it still doesn't fire do you have at least a 100psi on the compressor?

Nov 03, 2015 | Dewalt D51844 Framing Nailer

1 Answer

My stapler will not fire it lets out a little air


This problem is usually caused by the safety foot not pushing the trigger firing pin all the way in. Easy test. Remove the nails and airline, remove the trigger to expose the trigger firing pin. Connect airline and with very quick motion depress the firing pin all the way in. If the gun fires then adjust the safety foot. If the gun does not fire, remove the head and pull out the headvalve. Lube all orings in the head with plenty of white grease. Reinstall head and test. If the gun still does not fire, time for oring kit. Good luck.

Oct 14, 2014 | Air Tools & Compressors

1 Answer

Porter cable rn175 type 1 roofing nailer. Unit shoots once by itself when first plugged into hose. After that initial shot, gun works perfectly. Unit has been fully rebuilt including trigger valve and...


I have seen this on dewalt and p/c guns. Usually caused by trigger valve but you mention that trigger valve is new. If the headvalve does not seat correctly on the top of the cylinder, the in-rush of air will leak past cylinder seal and push down the piston (feels like you fired the gun ) . Difficult to pin down the problem but could be headvalve is sticking slightly open. I would suspect headvalve orings too tight or spring in head is weak or cylinder in head is worn. Easy to check. Remove the head and push in the headvalve with thumbs. The valve should be stiff to depress but return freely. Check that the cylinder in the head where the outer headvalve oring makes contact is not scratched or worn. If scratched, sand with fine sandpaper till smooth. If worn and depressed, replace head. If spring feels weak, stretch it a bit pulling it apart. Lube cylinder /orings with white grease. Untill you find the problem, do not load nails untill after airline is connected. On the dewalt guns, firing when air is connected is due to the trigger firing pin orings worn. You could check this on your gun by spraying soapy water on the trigger valve under the trigger then connect the airline. If air is blowing out the trigger when you connect air, most likely faulty valve. Good luck and let me know what you find out on the unusual problem.

Nov 01, 2013 | Tools & Hardware - Others

1 Answer

I put a new o ring rebuild kit in my Bostitch N80 sb framing nailer. I replaced every o-ring (including the trigger valve assembly


If the new trigger valve leaks air when you connect the air supply, most likely defective valve or air is leaking past outer trigger valve orings due to debris in the slot or new orings were cut when the valve was pushed in. If air leaks when you depress safety to fire gun then most likely problem is in the head valve or safety foot is not pushing the firing pin all the way in. Easy test, remove nails and remove the trigger to expose the firing pin. Connect air and very quickly depress the firing pin all the way in. If the gun fires, adjust the safety foot as needed. If the gun does not fire, remove the head and check headvalve orings for good snug fit against the cylinder within the head. The surface were orings make contact must be very smooth and not too deeply worn. If you notice fine scratches remove with fine sandpaper. Reinstall head using plenty of white grease on all the orings within the head and retest. Good luck

Feb 10, 2013 | Stanley Bostitch N80CB Coil Framing Nailer

1 Answer

DeWalt D51823 nailer shoots continusously when plugged into air hoswe


Shooting continusously caused by worn orings in the trigger valve and in the gun.Dewalt framing nailers use some vinyl orings (gold or clear in color) that fail too soon in both the trigger and the cylinder spacer (white plastic). Air out the nose of gun indicates air is leaking past the cylinder spacer seals (If piston is pushed down with air leak then headvalve seal is leaking (remove nails for this test)). If piston is not pushed down with leak, remove head and pull out the cylinder with cylinder spacer (white plastic). Place the cylinder on workbench with bottom up. Push down on locking ring and remove retainer to release all the other parts. Take picture or take note of parts together and as you pull them off to aid in re-assembly. You will need to replace the two orings between the white cylinder spacer and the cylinder. Order oring kit from dewalt or just purchase one ( # 141 universal oring ) and one metric oring 74.4mm x 3.1mm from hydraulic parts store. If the piston was pushed down with air leak, replace headvalve orings in the head. The trigger valve also has vinyl orings on the trigger pin. You could try replacing the orings but hard to find . Pin uses 2mm x 1.5mm. The orings on the inner valve should fit snuggly on the outer contact surface. If the valve just falls out the the body, the orings are too loose or the body is worn. I would just replace the trigger valve to be safe, however repaired works ok if you can find the orings. Trigger orings do not come in the kit. I would also remove the nails after each use and only reinstall them after air is connected and gun seems to work as it should. The Good luck with your repair.

Dec 23, 2012 | Air Tools & Compressors

1 Answer

My husky framing nailer leaks air around trigger


Leak around trigger could be trigger valve internal orings or orings on the outside of the trigger valve making contact against the body of the gun. Spray soapy water to determine where the air is leaking from. If air is leaking around the outside of the valve, most likely the orings were cut upon installation of the valve. If leaking from internal valve, most likely worn or broken oring; easy to fix if you have a source for orings.

To remove the trigger valve for service or inspection (take close-up photo of trigger area for reference ):
disconnect airline, remove nails, remove trigger retainer pin, remove trigger, remove roll pin /s holding trigger valve in place (use 3mm punch to remove retainer roll pins which are located in the body of the gun just above the trigger valve). With retainer pin/s removed and with gloved hand (under trigger valve), apply air pressure to gun to blow out the trigger valve (use lower pressure to push out trigger valve because it could come out with force.). With trigger valve in hand notice that there are two slots or groove cut neer top of the valve where the retainer pins rest, you will need to reinstall valve into body with slots aligned to retainer pins. Remove retainer pins holding trigger together to pull out internal valve. Good luck and post again if your have other question about the trigger valve.

Nov 15, 2012 | Air Tools & Compressors

1 Answer

Gun is full of nails, but acts like it is empty (the plunger won't advance). You go to tap it with the trigger pulled, and it just does nothing. Seems like firing pin is not getting air or somet


If no air is leaking from the gun, take out the nails, remove trigger by removing 3mm hex head bolt to expose the trigger pin. With air connected and side door open so that you can see the feeder, quickly depress the trigger pin with finger. Gun should fire. If gun does not fire (only makes air sound at trigger) dissconnect airline, remove head and lube headvalve with white grease and reinstall. Test again. If ok replace trigger. If still no joy, replace trigger valve with new factory or generic (part # TVA6). If gun fires but does not activate the feeder claw, remove two 6mm hex bolts from front of gun and split apart upper and lower body and check white oring (part # 149885) Good luck

Oct 16, 2012 | Stanley Bostitch Rn461 Gun Coil Roofing...

1 Answer

I got air leaking out the barrel where the nail shoots from.


Without model number I cannot be more exact, however, air leaking from nose as soon as you connect the airline indicates that the cylinder spacer orings are leaking. The cylinder is usually sealed by a plastic or metal ring with an oring at the outer edge and seals against an oring installed at the cylinder. Broken oring or grit entering the gun will cause the orings to leak. A quantity of air leaking from the nose when you fire a nail indicates that the lower bumper is cracked or missing pieces. Air leaking from nose with driver being pushed to bottom of cylinder when you connect the airline indicates that the cylinder seal at top of cylinder is leaking. Parts are available at www.toolpartsdirect.com Good luck with your repair and post again with model number if you need more help.

Apr 19, 2011 | Stanley Bostitch Nail Gun

1 Answer

I have the 2 1/2 Hitachi for nailing siding. The nail gun had not been used for a couple of years, but now will only drive the nail half way in. Sounds like an air leak when driving the nail. I have...


Remove the nails and air supply. With side door open notice position of driver. Driver should be at top position with tip not visible. If driver is down and it moves within cylinder when you tilt nose up then down again, time to replace orings. If driver is down, it should extend past the nose about 1/4 inch (if driver is broken at the tip the end will look rough and nail will not drive in all the way). If driver extends past the nose more than 1/4 inch then lower bumper may be breaking up /cracked. Easy test for proper function. With nails removed and side door open, connect air to gun and dry fire gun against hard rubber or old coiled air-hose (with air connected and trigger depressed, no air should leak from trigger area, if air leaks when trigger is depressed, look for fault at trigger pin). Feeder should move back then forward in quick motion almost matching speed of driver and driver should not creep down between shots. No air should leak from nose of the gun (push nose against hard rubber and depress trigger and hold in this position, driver should stay down with very little or no air leaking out of nose, when you release trigger, driver will return). If air leaks out of nose while holding in this position, replace lower bumper. If a quantity of air leaks from valve in front of trigger, cylinder orings may need replacing or outer part of cylinder has fine scratches (remove scratches with 400 grit paper). Parts are available at www.toolpartsdirect.com. Good lucki

Apr 16, 2011 | Nailers Hitachi Nv83a2 3 14" Coil Framing...

1 Answer

Brand new unit. Used last weekend, no problem. Today, won't shoot nail. Air is released when trigger pulled, but no nail plunged.


Orings /other parts tend to stick when nailer is new. Dewalt uses some vinyl orings that have been causing premature failure. Be sure to add a few drops of oil when used. Too much oil is not good. Wrong oil will cause orings to swell and cause problems such as yours. Your nailer's firing valve can be reset by rapping the nailer against rubber surface such as a thick rugger mat or coiled rubber air hose. Remove airline and nails, being carefull not to damage the head, rap had against rubber mat and retest gun. If it did not reset rap against nose of gun and test. If no joy, you will most likely need to remove head and manually move cylinder up/down and /or check vinyl orings for failure. Before you try to reset the gun, make sure that the safety is pushing the firing pin all the way in. Air removed, look under the trigger as you push down on safey, if it does go all the way in try bump-firing the gun (for test have nails removed). Hold in trigger and quicky /firmly strike gun against rubber pad. Good luck

Nov 14, 2010 | Dewalt D51850 Heavy Duty 20 Degree Full...

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