Question about Stanley Bostitch FN16250K - 2 16 - Gauge Magnesium Straight Finish Nailer

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Leaking air when trigger is depressed - Stanley Bostitch FN16250K - 2 16 - Gauge Magnesium Straight Finish Nailer

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This is an indication of a defective seal. Try adding a little pneumatic oil to the gun and triggering it a few times. Sometimes all it is is a small leak in the o-ring because of a lack of lubrication. If not, then try replacing the o-rings (kit available for around $20). The next possibility is the trigger itself. I have replaced the trigger assembly on mine once thus far.

Good luck,
Dan

Posted on Jul 12, 2010

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Posted on Jan 02, 2017

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Soory It is a roofing nailer not a Paslode framing nailer. ended up replacing the main valve. all is well now. thanks

Posted on Sep 30, 2008

rowdy45176
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SOURCE: leaking air from the trigger

if this is a Bostitch you have a bad o ring probably around the trigger and would need a trigger assembly, you didnt specify where the air is leaking from, please give me the brand and more details and I will try and help

Posted on Jun 13, 2010

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1 Answer

Bostitch just blows air when trigger is pulled


Air leaking from trigger when attempting to fire the gun is normal and should cause nailer to fire, however if the trigger pin is not depressed all the way in,the gun may not respond. Easy test. Remove the nails and remove the trigger. Connect the gun to air and quickly depress the valve pin all the way in with finger. If the gun fires, adjust the safety foot so that the trigger pin is depressed all the way in. If the gun still does not fire, then remove the head cap and pull out the headvalve. Apply plenty of white grease to orings and retest. If the gun fires, then replace the headvalve orings. When the headvalve orings are worn, air will leak from bulkhead chamber to the headvalve chamber causing the gun to not respond to the trigger. The addition of grease to worn orings will make them temporarily seal. Good luck

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I have a Bostich coil roofing nailer #RN46-1 leaking air at trigger area when depressed. Replaced trigger assy but same results. Anything else it could be?


Sounds like your gun needs servicing. normally strip, clean and usually fit new O rings to head valve assy, piston & usually sleeve.

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Hitachi 45ab blowing air out of trigger


If air leaks thru trigger as soon as you connect airline, replace the vinyl ball under the trigger stem. If air leaks when you depress the trigger, replace the small oring on the trigger stem. If air leaks slightly from plunger in front of the trigger valve, problem is inside of the gun. Remove the head and pull the large circular plate. Replace the large outer oring. Good luck

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1 Answer

Blowing air out of trigger


Leaking under trigger could be the ball seal part # 875645 if leak starts as soon as you connect the air hose. If no air leaks when you connect hose but begins to leak when you depress the trigger then replace the oring on the plunger which is part # 874820. If air leaks when you connect the hose and the ball mentioned above is good then most likely is leaking from oring # 876161 installed on cylinder plate (remove head and pull out the plate). Good luck.

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1 Answer

With the safety depressed, it only blows air when the trigger is pulled. I had it in a shop for the same problem and it worked for a little while and then did the same thing.


No model number given for specific solution, however, the problem that you describe is caused by air leaking past the orings in the headvalve or head gasket(you will not hear air leaking out of the gun, air is leaking between pressure chambers) or the safety foot is not pushing the trigger pin all the way in. Easy test. Remove the trigger and manually depress the trigger pin in very quickly. If the gun fires, adjust safety foot. If gun does not fire , remove the head and pull out the headvalve. Look for small scratches on the surface where the orings make contact to the head. Remove fine scratches and lube with plenty of white grease and retest the gun. Good luck

Nov 15, 2012 | Air Tools & Compressors

1 Answer

Hitatchi nv45b2 trigger leaking


Air leaking around the trigger area could be caused by vinyl ball / gasket under trigger valve bushing or orings within the gun. Easy test, remove nails and connect air (assuming that air is now leaking around the trigger area). Depressing the trigger stops the leak, replace vinyl ball. Depressing trigger does not stop leak, move plunger b (plunger B, small shaft under bubber bushing next to the trigger valve) with your finger in then out to determine if air leak changes tone. If air leak changes sound or tone, then air is leaking past orings of the cylinder guide and/or cylinder plate and/ or the cylinder itself is scratched by debris where the orings make contact. Pull out the cylinder and examine the contact areas. If scratched, use 300 grit paper to smooth, if smooth, however, suspect the orings of cylinder guide (or cylinder guide is cracked). The cylinder guide is difficult to remove and install without causing damage to guide or cutting new orings when installing. Do not remove the guide unless all the other options have been checked. One last bit if information, I have noticed that some guns will leak air if the orings on the feeder piston do not fit snuggly. Make sure that leaking sound is not coming from feeder area (remove the basket and feeder/feeder pin/spring and pull out the feed piston, making sure that the largest oring is making good contact within the cylinder). Good luck with repair.

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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

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Air is leaking through trigger when trigger is not depressed. When trigger is depressed and nail tail cover is in safety position (holding gun in air) it completely stops. The gun fires well but there is...


could be either that or a damaged o ring, when was the last time serviced, all o rings replaced?? could be that the tool needs a thorough cleaning and new one installed. it is not hard

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1 Answer

Leaking air from the trigger


if this is a Bostitch you have a bad o ring probably around the trigger and would need a trigger assembly, you didnt specify where the air is leaking from, please give me the brand and more details and I will try and help

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2 Answers

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