Question about Stanley Bostitch BT200K

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Trigger problems When I pull the trigger air leaks out of the trigger but the gun will not fire. Do you replace the trigger assembly or just the o-rings

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I have repaird hundreds of nail guns with a problem similar to yours. Depending on the brand and model, the problem can be repaired by checking the following. Headvalve orings should be checked for wear and any surface that the orings contact must be smooth and free from scratches. If the surfaces are scratched try to smooth with fine sandpaper and use light grease instead of oil when assembling. The safety contact foot may not be reaching high enough into the trigger to properly push in the trigger button. Check for worn spots on the trigger that may be filled in with epoxy, loose fitting trigger caused by worn roll pin or retaining pin. Some of the trigger valves as used on many bostitch nailers (tva6 valve) used a plastic pin which contacts the trigger. If this pin is loose or worn the valve should be replaced. Some tva6 valves have a vinyl looking sort of oring that fits too loose on the spool. This vinyl oring in not available by itself but if the oring fits too loose the gun will not fire and leak air. On bostitch remove the trigger and the rollpins holding the trigger valve and apply air to gun to eject valve. (use heavy glove to catch valve as it will come out with force)

Posted on Nov 25, 2008

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Usually they come in assy

Posted on Sep 26, 2008

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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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1 Answer

I have already changed trigger valve assembly, O rings and all. Still leaks when I try to fire. Will not shoot brads just leaks lots of air around trigger assembly.


Most likely problem is the head valve orings not making perfect seal. Remove the head and pull out the headvalve piston. Apply plenty of white grease to orings and test fire. If gun fires, will need oring kit soon. Good luck

Aug 14, 2015 | Stanley Bostitch SB1850BN 18Gauge Brad...

1 Answer

Air leaking from trigger Bostitch SB1850BN


Most likely the orings or seals in the headvalve are not making perfect seal. Remove the head and pull out the headvalve. Apply plenty of white grease to orings and test again. If the gun fires, then will need oring kit soon, or just keep using plenty of grease. If the gun still does not fire, check that the safety foot is depressing the trigger valve all the way in. Good luck

Aug 13, 2015 | Stanley Bostitch SB1850BN 18Gauge Brad...

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

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1 Answer

All the sudden the nail gun stop working, pull the trigger air leaks out at trigger area


I had a similar problem with one of my nail guns. What I found was a small rubber o-ring in the trigger mechanism had split. Once I replaced this the problem was corrected and the unit functioned fine.

You could replace the whole trigger assembly for about $35. But if you remove the assemble and replace the split-ring this would only cost a couple of bucks at most.

Trigger assembly shown below. ereplacementparts.com is one possible source for the trigger assembly others can be found on the Internet.

part_641006-00_med.gif

Aug 21, 2011 | Dewalt Heavy - Duty 31° Clipped Head...

1 Answer

GUN DOES NOT FIRE FOR SEVERAL ATTEMPTS--even though gun is pressed firm against work---just had unit serviced and trigger valve replaced-----any suggestions? thanks joel


Remove nails and remove trigger to expose trigger valve pin. Place nose of gun against rubber pad or old coiled up air hose to absorb impact of driver and with very quick and deliberate motion press in trigger pin. If gun fires, then problem is with safety foot not pushing trigger pin all the way in (or worn trigger). Make adjustment as needed or replace faulty parts. If gun still does not fire, then likely problem is with headvalve. If headvalve orings are leaking, gun will not fire. Test for leaking orings as follows. Remove head and remove headvalve, apply silicone paste lube (plenty) to all orings and where orings contact. Assemble and do test above. If gun fires then surface where orings contact is allowing air to leak(smooth with very fine sandpaper if scratched).

Mar 13, 2011 | Stanley Piston Driver Assy Bostitch N60fn...

1 Answer

Bostitch RN46 will not fire nail, only releases air when trigger is held and firing tip is touched to surface of material. Any ideas on what is wrong?


Gun will not fire if air is leaking past orings in head /headvalve or safety /trigger is not pushing trigger pin all the way into trigger valve. Test: Remove trigger to expose trigger valve pin. Remove nails. Place nose of gun against thick rubber mat or coiled rubber hose to absorb blow of driver. Very quickly and deliberately press trigger pin all the way in. If gun fires, safety foo or trigger is not pushing trigger pin all the way in. Make adjustments or replace worn parts. If gun still does not fire, remove head and pull out headvalve. Apply lots of silicone paste lube on the orings and the surface of the head where orings make contact. Reinstall head and test as above. If the gun fires then orings were leaking. Replace orings and sand any scratches on body of cap with very fine sand paper. Parts are at www.toolpartsdirect.com Good luck

Mar 06, 2011 | Stanley Factory Reconditioned Bostitch...

2 Answers

Air leaks arond trigger when depressed, but no nail fires.


Where does the air leak out from? If it leaks from the trigger DeWalt makes a trigger valve assembly part # 641006-00 list 8.89 BUT if it leaks from other areas we have to look into it deeper. If it is just the trigger valve let me know and I will give you instructions how to remove and install the new one.

Feb 05, 2009 | Dewalt Round Head Framing Nailer D51845

1 Answer

Air escapeing through triger assembly


The problem that you are describing usually occurs when fine scratches in the head allow air pressure to bypass the orings. Here are a couple of simple tests. Remove the trigger from the gun to give access to the trigger valve plunger. Remove the nails from the gun. While pointing the gun away from you, connect the air supply. There should be no air leaks. Now quickly depress the trigger pin all the way in. This must be done with a very rapidly movement. If the gun fires, then the safety foot is not pushing the trigger pin all the way in. Check for worn trigger or safety mech. When the safety foot is depressed against the work, the trigger pin should be depressed all the way into the trigger valve for the gun to fire. Hold the trigger closed tightly and very firmly depress the gun against the work, the gun should fire. If it does not fire try next test. Remove the head from the gun. Hold it in your hand and depress the headvalve all the way into the head with you thumb. While holding the headvalve in, place a finger over the small venthole on the mating surface of the head and release the headvalve. Vacuum should hold the headvalve in the head for a moment until you release the vent hole. If the headvalve springs back with finger over venthole you must remove the headvalve and inspect the surfaces with maginfing lens for fine scratches. Remove scratches with very fine paper to obtain smooth polished surface. Lube surface with silicone lube (looks like vaseline, sold in small container at Lowes plumbing department used for lubing faucet orings ) re-assemble gun and make sure that you tighten headbolts firmly. You should be ready to work. Good Luck!

Jan 01, 2009 | Air Tools & Compressors

1 Answer

Jammed makita an923 nail gun


On most all nailguns when the trigger is activated air pressure is released from the headvalve causing the headvalve to open and fire the piston. If air leaks through the headvalve orings or through the headgasket port to headvalve, it will not fire. Try applying light grease to headvalve orings and make sure that headgasket is sealing around vent hole. If it fires then replace orings in headvalve for long term repair. Secondary problem is worn safety parts and trigger or trigger pin. If these parts are worn the trigger will not push the trigger valve pin all the way in when you bump fire the gun. With air supply disconnected, apply pressure to safety while depressing the trigger and check thet the pin is moving all the way into the trigger valve. Adjust or replace as necessary. Enjoy

Sep 13, 2008 | Air Tools & Compressors

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