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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My bostitch n88rh framing nailer will fire when pointed down but wont fire pointed horizontal.


Nailers are made to use in any position so must be something simple to fix. Most likely safety contact foot, to test, remove the nails, remove the trigger to expose the firing button on the trigger valve. Connect air and dry fire onto wood or old coiled rubber hose in various positions. If the gun tests ok then carefully examine safety foot mech. and trigger for loose components missing guide or roll pin. The contact foot must push firmly up on the lever within the trigger thus pushing on the firing button. If the safety foot and trigger are in good conditon and working ok, then problem is within the headvalve and piston orings. To test piston oring, remove airline and nails, point nailer up then down again. The piston should stay in the top position. If the piston moves up /down with movement of gun, replace piston oring. If piston oring ok, remove the head and pull out the headvalve. Apply plenty of silicone paste or white grease to orings on headvalve and reinstall and test. If tests ok, then problem is worn orings in the head /headvalve. You can keep lubing or replace orings. Examine the surface within the head where headvalve orings make contact. If there are many fine scratches, even new orings will not work very well. Try to remove scratches with very fine sandpaper. Good luck

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1 Answer

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1 Answer

It leaks air around the triger


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1 Answer

My hitachi framing naile has a lek somewhere and the piston wont return


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1 Answer

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1 Answer

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1 Answer

Flooring nailer tech support


couple of things there are o-rings inside that trigger assy. they are either pintched in or dry. next there could be internal rubber hoses inside the gun. might need replacing. lastly the hose or o-ring going to the back side of the ram is leaking or broken. here is what i would do. you sound pretty handy with your tools so i would get somewhere clean start taking the gun apart thouroghly noting where everything went and go untill you find the problem. but first i would shoot a couple of drops of oil into the air input on the gun then hook it up and fire a few off and see if it clears up, if not then start takeing it apart. I CAN NOT STRESS ENOUGH....DO THIS ON A CLEAN SERFACE WITH YOUR HAND CLEAN. i chased a leak around in a pnumatic hammer for 3 days all because it wasnt clean on the inside..

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