Question about Stanley Bostitch 18 Gauge Brad Nailer 1 - 1/4IN - BT125K - 2

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Miss fires very often

Driver will not return completely after every shot. It does drive nails all the way in. I replaced the "o"rings and the trigger assembly but the problem still exists.

Posted by Anonymous on

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 1383 Answers

SOURCE: Trigger problems

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

brewerstool
  • 141 Answers

SOURCE: fires first nail then won't return driver for next

There could be a bunch of different problems with a nail gun that does this. First and foremost check to make sure you are using the correct angle,diameter, and head nails for the gun you are using. Sometimes this can cause hangups and not allow the driver to retract. After checking this I would let someone who has worked on nail guns before take a look at it. There could be many different causes, too many to list here. Good luck.

Posted on Sep 09, 2009

rowdy45176
  • 2176 Answers

SOURCE: The replacement trigger valve assembly will not go

are you making sure that you have the slots aligned where the pins go into it. also did you lube the o rings before trying to install.and I assume that you removed the trigger assembly first. Let me know what you find that I have suggested and I will try and come up with more but this should help as long as you bought the right valve assembly, and lastly make sure that the cap on top of the old valve is not stuck in the tool not allowing you to insert the new one.

Posted on Dec 09, 2009

  • 223 Answers

SOURCE: Model # N88RH When I pull the trigger it drives

Do you lubricate it regularly? Give it a squirt of oil, see if that brings it back to where it should be.

That's a nice gun, when I can afford it I'll have one too.

lp

Posted on Dec 29, 2010

rowdy45176
  • 2176 Answers

SOURCE: I have a N-60 finish

the trigger valve could be causing a lot of your problems, you are correct in ordering the o rings and trigger valve, make sure to lightly coat the o rings before installl. If you have trouble with the valve I have detailed instructions in the TIP section on how to remove safely.

Posted on Aug 16, 2011

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1 Answer

OK, second shot at this: About 65% of the time my SFN30 Senco finish nail gun only shoots a nail every OTHER pull of the trigger. All the O-Rings are good and the driver blade is perfectly straight.


There are 4 main causes usually with this tool:
1) Check the seal in the bottom of the cylinder (under the bumper) #BF0070 (#12 on the breakdown) If this seal is missing or worn the piston will not always return fully.
2) The pusher spring #GD0253 in the magazine is not moving the nails forward
2) The driver is bent or the tip is worn / chipped
3) The check valve ring #LB0077 on the cylinder is not sealing properly
Let me know if this helps Senco SFN30 15 Ga Finish Nailer Parts

Feb 26, 2017 | Senco Air Tools & Compressors

1 Answer

With 90 # air and PC nails. When I pull the trigger nothing happens. No air noise, no nailing, no movement - just dead. It's been oiled every use.


Most likely stuck trigger valve. Easy to check. Remove nails, remove trigger to expose the firing pin of trigger valve. Connect air and very quickly depress the firing pin all the way in. If the gun fires , adjust the safety to depress the trigger valve completely. If the gun does not fire, replace firing valve, or remove and check /lube o-rings in valve. Good luck

Jul 11, 2015 | Air Tools & Compressors

1 Answer

My gun has always from day one punches out 2 nail and jams up or not, is there an adjust ment for this problem


Nailers will double fire or at times, the driver will hit two nails with one stroke. The first issue is caused by sensitive trigger or worn orings and the second problem is caused by faulty nails (too close together in strip ) or the driver is bent slightly allowing the driver to strike the head of the second nail in line. One way to prevent double fire is to use the single trip trigger (usually white plastic). With this trigger, you must lift the gun off the work, release the trigger and press the gun against the work and pull the trigger. If you are using the black bump fire trigger and it double fires, replace the trigger valve. The issue of the driver blade hitting two nails with one stroke can be solved by examining the driver blale for damage. The blade should have a taper on the side that faces the nails. This taper is there so that as the driver hits the first nail the taper will gently push the rest of the nails slightly into the rails out of the way. If generic nails are used, make sure that the nails are designed with the proper spacing and angle. Easy test. With the gun on its side, place a strip of nails on top of the rails with the heads aligned with the angle of the rails. Move the strip of nails so that the first nail is in the path of the driver and the heads are still aligned with the rails. The first nail should align perfectly with the angle and path of the driver. If the head of first nail is in the path of the driver however the shaft of the nail is angled toward the rails, the driver blade may hit two nails. If the point of the first nail is in the path of the driver and the head is angled back toward the rails, you may have miss fire. If the nails are perfectly aligned with the rails and the path of the driver and the driver is hitting the second nail, grind more taper at the bottom inch of the driver. Good luck

Oct 14, 2011 | Stanley Bostitch N88rh Framing Nailer...

1 Answer

DOESN'T FEED,IT MIGHT MISS SHOOT A TIME OR TWO THEN GET A NAIL THEN NOT FEED.I'M SHOOTING A 1.5"TECO NAIL. ANOTHER GUN DOESN'T SHOOT EVERY TIME LIKE THE DEPRESSOR ISN'T LETTING THE...


Usually miss feed happens when the driver does not return to top position not allowing the nails to feed into position. Easy to check, point nose of nailer up then down again to see if the driver is loose in the cylinder. If loose, the driver will be in the down position when the side door is opened. If driver is down, replace driver oring. If driver oring is good, look for spring tension on feeder and check feeder spring on the door side. If piston oring good and feeders have good spring tension, suspect lower bumper cracked(remove head and piston to check bumper).
On gun with depressor (safty foot) not actuating trigger, look for worn trigger (trigger inner lever could be worn) or loose or worn firing pin in the trigger valve above the trigger(valve # tva6). Replace as needed. To check for proper gun action, remove the nails, remove the 3mm roll pin holding trigger and dry fire the gun by depressing the tigger pin. Good luck

Sep 21, 2011 | Stanley Bostitch Coil Framing Nailer

1 Answer

Only shoots out one nail for every 4 or 5 trigger pulls


The gun will miss fire if the driver does not return to top position allowing nails to move into position. Could be bent driver, faulty trigger, cracked lower bumper or check valve not in place. Easy to check if trigger. Remove air supply, and remove the pin holding the trigger. Fire the nailer by depressing the firing pin with your finger. If the gun works ok, single fire trigger is faulty or safety foot is out of adjustment. If still miss fire, remove head and pull out cylinder and piston. Check for bent driver, cracked lower bumper or black band (check valve) is out of place on outer part of cylinder covering a row of holes.

Aug 23, 2011 | Porter Cable Cable Factory Reconditioned...

1 Answer

Gun will not shoot nails completely;no matter what wood,thickness,etc.they drive all but 1/2"


May be due to broken tip. Easy to check. Remove nails and leave door open. With door open, lightly tap the nose of the gun against coiled rubber hose or soft wood. The driver should stay at top position. If driver falls to bottom of the cylinder, replace piston oring. Now press nose of the gun against old coiled up air hose or soft wood and squeeze and hold trigger. The gun will fire and the driver should stay in the down position untill you release the trigger (if not single fire trigger, if single fire trigger remove trigger and press the trigger pin with finger). While the driver is down, make sure that the tip extends past the nose about 1/4 inch (if air leaks past the nose in this position, replace lower bumper). If the driver does not extend past the nose, replace driver. Good luck

Jun 24, 2011 | Stanley Bostitch N75c1 Coil Sheathing...

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 hav a coil nailer the problem coming is it fires double nail right after one blank shot , i hav tried everything by replacing its all types of O rings also changed the piston but the problem still...


Remove nails from the canister and test fire the gun very rapidly with side door open against hard rubber (old tire or coiled up rubber hose ) to absorb the energy. Look for driver and feeder to move in time together and driver should return to top each time. If feeder appears to lag behind, check feeder orings and air passage to feeder piston. If driver appears to come out out nose too far or if it does not go back to top every time suspect problem with bumper or cylinder check seal. Look at feed check built into the side door. These must make contact with nails to prevent miss fire. If all appears to look normal, replace the TVA6 valve if the firing pin fits/feels loose in body of the valve. Miss fire occurs when nail checks do not hold nails in place (feed checks on door and feed piston) and or the piston does not go all the way back up so the nail can not feed into place. Less often, miss fire is caused by lower bumper missing pieces /cracking and the crumbeling bumper pieces enter the feed piston chamber preventing the feeder from making full travel forward. One more area to check is the head /headvalve. Remove head and pull out headvalve. Remove fine scratches on surface of head where orings make contact (use 400 grit paper) and lube with silicone paste lube (sold at Lowes in the plumbing department). Finally check the cylinder seal sitting on top of the cylinder. It should fit very snugly against the cylinder and not turn. If it can be turned, replace with new or remove and apply RTV sealant and replace, then wait 24 hours before use. Good luck

Apr 09, 2011 | Stanley Bostitch Coil Framing Nailer

1 Answer

Feeding nails


Your nailer shares design features with Milwaukee and Ridgid. All three brands experience the same issue. Lets go thru a series of simple tests to determine the problem. First and most simple test, manually load the nails and fire the gun untill miss-fire. Upon mis-fire disconnect air, open latch and check if the driver is all the way up into the cylinder or is partially down blocking next nail. If driver is down blocking next nail, replace the driver oring and retest. If driver is up all the way, remove nails, reconnect airline, leave latch open and fire gun against rubber (old tire or coiled up waterhose/airhose) this time holding the gun down and keeping the trigger depressed. In this position, the driver will remain down and feeder will remain retracted. With feeder retracted and screwdriver in hand carefully check the spring tension on the feeder (should be rather firm tension on spring and the feeder must retract with good force). If no tension or weak, replace feed spring. When you finally release the trigger, the driver will retract and the feeder should return with good force. If feeder does not return with force, replace orings and spring behind feed piston. If all tests are ok, remove head, check lower bumper in gun for cracks or missing pieces. Replace as necessary. Lube all orings with silicone lube available at Lowes in the plumbing department. (Danco brand) Good luck on your repair and email your questions.

May 06, 2009 | Porter Cable Cable RN175AR Reconditioned...

1 Answer

Max 890s coil nailer does not advance nails when operated.


Make sure you have at least 100 psi available and I would pretty much drown the sliders and other moving parts in something like Marvel Mystery Oil.

Feb 26, 2009 | Mx Max Cn890s Coil Nailer O`ring Parts Kit

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