Question about Stanley Bostitch N80s Nailer -rebuild Parts O`ring & Seal Kit

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Air leaking out of the trigger area, no pressure at all

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  • Stanley Master
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Your nailer uses a trigger valve (part # tva6 cost about $20) and is sold at www.bostitch.com or generic valves sold on ebay . If you have a source for orings, you could try to repair the valve. Remove the roll pin that holds the trigger to expose the tva6 valve. There are roll pin/pins that hold the valve in just above the valve in the body. Remove these pins and apply air pressure to gun to pop-out the valve. Use caution when you do this. Remove nails, lower pressure to gun and use glove or rag to catch valve because it could come out with force. With tva6 valve in hand remove two pins that hold valve together and remove inner plunger. The middle oring on plunger is cause of leak. Try using an oring about same size as the broken seat. It must fit pretty tight to work. If you had a small leak it could be that the firing pin orings fit too loose or just too worn. Use silicone lube or oring lube on the orings and the valve port. Good Luck on your repair and email if you have other questions.

Posted on Sep 05, 2010

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Posted on Jan 02, 2017

  • 272 Answers

SOURCE: When pressing the trigger to fire a staple, all I get is an air leak from the area of the trigger.

They all leak a little on firing. Is it a big blast of air or just a hiss? All guns have a 'safety' device that keeps them from firing unless you follow a set pattern. You must push the gun down where you intend to put the staple which releases the safety before you pulll the trigger. You must then release the trigger move the stapler off the piece push it back down again before you can fire another staple. You can get (free) frrom the manufacture a rapid fire shoe and trigger that allows you to hold down the trigger and bounce the stapler along your work shooting merrily away.

Posted on May 08, 2009

  • 548 Answers

SOURCE: Hitachi 83a Leaking Air from the Trigger

yes my guns i rebuild once a year at least

Posted on Aug 21, 2009

SOURCE: Have a bostitch N60 with a trigger air leak

PC Tech 50 was right on the money. After a couple of tries I found the correct O ring is a number 78 Danco which I purchased at Lowe's, 10 for a couple of dollars. You have to push pretty hard to get the center portion of the valve to seat but the retaining pins won't fit in until it is right. Make sure it is well lubed with the silicone grease. Now we will see how long it lasts. Thanks PC Tech 50!

Posted on Sep 04, 2009

  • 1383 Answers

SOURCE: air leaks around green cylinder at trigger area

Your nailer uses a trigger valve (part # tva6 cost about $20) and is sold at www.bostitch.com or generic valves sold on ebay . If you have a source for orings, you could try to repair the valve. Remove the roll pin that holds the trigger to expose the tva6 valve. There are roll pin/pins that hold the valve in just above the valve in the body. Remove these pins and apply air pressure to gun to pop-out the valve. Use caution when you do this. Remove nails, lower pressure to gun and use glove or rag to catch valve because it could come out with force. With tva6 valve in hand remove two pins that hold valve together and remove inner plunger. The middle oring on plunger is cause of leak. Try using an oring about same size as the broken seat. It must fit pretty tight to work. If you had a small leak it could be that the firing pin orings fit too loose or just too worn. Use silicone lube or oring lube on the orings and the valve port. Good holidays.

Posted on Dec 02, 2010

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1 Answer

Hi, I have been stumped! I rebuilt a Hitachi


This is the Cars and Trucks section of Fixya. You might get more answers listing in another area of Fixya which more closely matches your device.

All things considered, maybe apply air pressure and stick the unit under water in a utility sink or big wash tub. Air leaks would bubble like a hole in a tire tube.

Sep 23, 2013 | Hitachi Tools & Hardware - Others

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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

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.

Sep 28, 2012 | Hitachi NV45AB2 Roofing Coil Nailer

1 Answer

My hitachi roofing gun leaks air from trigger when not pressed


Two areas to check when air leaks from around the trigger. Rubber ball under trigger pin will cause air to leak, however when good side of the ball falls on the seat, air will not leak for a while. If air is leaking from plunger pin (just in fromt of the trigger pin), remove the head and pull out the cylinder plate to reveal broken oring (oring part # 876161). Good luck with your repair project.

Jun 05, 2012 | Hitachi NV45AB2 Roofing Coil Nailer

1 Answer

Hey, I'm having trouble with my Dewalt 18ga Brad Nailer trigger. Can you send me the directions you have on how to get into this thing? I'd really appreciate it.


For removal of dewalt D51238k trigger valve. Remove the nails.
Remove the pin holding the trigger in place. Then remove two roll pins in the body of the gun just above the trigger (3mm roll pins). With gloved hand, apply air pressure to the gun which will pop out the trigger valve. Use caution because the valve could come out with force. Try with low pessure first, then increase as needed. If you are removing the trigger because the gun will not fire, (only puff of air from trigger area), suspect problem in the head valve instead (usually, trigger valve is bad if air leaks from trigger when you connect air ). Good luck

Sep 26, 2011 | DEWALT D512381 18Gauge Brad Nailer ORing...

1 Answer

Leaking air through trigger area. Will not nail at all.


The trigger valve has seven orings. The oring kit may not include all orings needed. To replace the trigger valve, remove nails, remove the rollpin holding the trigger with 3mm driver to expose the trigger valve. Next remove one or two roll pins holding the trigger valve in the body of the gun. Apply air pressure to gun and catch the valve with gloved hand (use caution because the valve may come out with force). Note the position of the valve in the body of the gun in relation to the roll pins. If the firing pin seems loose in the body of the valve, replace the whole valve(could be # tva6 cost about 20 dollars on ebay). Good luck

Aug 23, 2011 | Stanley Bostitch N80s Nailer -rebuild...

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

I had a air leak in my Bostitch framing gun. I replaced the trigger valve and it still leaks air around the trigger. Any suggestions?


Remove the trigger and remove the nails, connect air. Try to determine if air is leaking from the outer edges of the valve or from the center when you move the pin. If from outer edge, remove roll pins that hold valve in the body of the gun. Apply air pressure to pop out the valve(use glove the catch the valve, it could come out with force). Examine the two outer orings of the valve for cuts and replace as needed. Clean the opening where the valve fits with 400 grit sandpaper to remove debris and check for worn areas. If clean, apply plenty of silicone paste lube on orings and opening and gently push valve back in. If it leaks from the center pin, you may have a defective valve. You could try to repair if you have access to orings. Remove valve, remove two retaining pins and take valve apart. Small orings on the center pin could be the problem. Good holidays

Dec 20, 2010 | Air Tools & Compressors

1 Answer

Blowing air through trigger area. Need rebuild kit? Longer version...started blowing air out of small hole in left side of casing. Leaked oil out of there as well but still worked fine. This has been...


If the trigger still works to fire the single shot, then the o-ring kit should be sufficient. If the trigger area continues to leak air, then the trigger should be replaced as well. Keep the gun well lubricated as well.

Dan

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2 Answers

Duofast ms 7664c staple gun still blowing air out


This series of nailers are the most difficult to repair. Your nailer has twice as many orings as the norm. Many have said that this nailer is over-engineered. There are three areas that could cause trigger area leak. To make it simple, lets do one area at a time. Use soapy water around the trigger area to find actual leak. If air is leaking from actual trigger valve (ms719-2) and its counterpart, the cartridge (ms719-1) then these two parts need to be removed. Check for scratches in the metal of the valve. If scratched try to remove with fine paper or replace as necessary. Most leaks are due to faulty trigger valve. If air is not leaking from actual trigger valve then remove the dump valve (mn120-5) at the back of the head of gun. There should be two small allen screws then metal lid, then spring and oring. Pull out dump valve and make sure all the orings are in order. This valve should be able to move, not too tight. Use silicone paste lube on all orings (available at Lowes in plumbing department, Danco brand used for faucet orings). Reinstall dump valve and related parts and check for leaks. If air seems to be leaking from bottom of gun neer trigger, most likely problem is cycle valve (mm419-1) and related vinyl seat. These two parts are in the valve housing under the trigger. This valve also moves within its housing and seats on a vinyl oring. This part could be clear vinyl or black rubber. New seats are clear. Inspect these parts for scratches/cuts and lube with silicone paste. Hopefully you would have solved the problem with trigger valve. Good luck with your repair and do not dispare, this is one of the most difficult guns.

Jun 18, 2010 | Duo Fast Air Tools & Compressors

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