Question about Stanley Bostitch N88rh Framing Nailer Driver Piston 158582

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The piston on my framing nail gun is stuck in the "out" position- how can I get this back to normal setting

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Posted on Jan 02, 2017

  • 1388 Answers

SOURCE: the piston on my framing

Assuming no air leaks, could be as a result of several problems. Things to check/try. Push driver up manually to full top position. This will reset the driver if it was stuck due to nail. Check for other debris in path of driver. If it very difficult to push up you will need to remove head and pull driver to check for bent shaft. If it pushes up easily and drops back down under its own weight, it needs a piston oring. If it pushes up easily/light force and stays up, fires once and stays down, then you need to replace the check valve (band or oring on the outside of the cylinder covering a row of holes). Parts are available at
If very stuck, I use a piece of driver that fits perfectly into the bottom of the gun and hit with large copper or brass hammer. If you must use a heavy hammer, remove the head and place body of gun on wood to prevent damage. Good luck

Posted on Oct 03, 2010

  • 104 Answers

SOURCE: n80sb-1 stanley bostitch framing gun.

try going to their website -I have several guns and each take at least 4 sizes of nails- yours should be no different- good luck hope this helps

Posted on Oct 16, 2008

  • 18 Answers

SOURCE: my bostitch framing nailer fires multiple nails each time i pull

sounds like driver is bent or worn

Posted on Mar 11, 2009

  • 1388 Answers

SOURCE: n80sb-1 stanley bostitch framing gun.

Yes your nailer will drive other sizes of nails. For info and parts go to and look for the support tab then select service parts. Here you will find parts list and manual. To remove the tva11 trigger valve remove the retainer pin (the pin is 3mm) for the trigger and remove trigger. Next remove roll pin/pins that retain trigger valve. Use heavy glove to catch trigger valve as you apply air pressure to gun. The valve could pop out with great force so try lowering the pressure to gun. Before installing the new valve, check the opening for sharp edges which will cut orings. Good Luck and email if you have more questions.

Posted on Mar 14, 2009

  • 2 Answers

SOURCE: my bostitch framing nailer fires multiple nails each time i pull

rather than push the nail gun and shoot one anail , try to hold the triger down and hit the areawith the tip of the gun , where you want the nail 
That will only put one nail in to the wood

Posted on May 17, 2009

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I have a new Bostitch F21PL framing nail gun. I used it for the first time on Saturday and it worked flawlessly through the first half-dozen nail sticks. Then, it jammed. The culprit nail was easy to...

when you removed the jammed nail did the piston driver move back into the rear position? if not there may still be a piece of the nail holding the piston.... If the piston is stuck in the forward position with the air disconnected use a hinge punch and tap it back, reconnect air and give it a try

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Miss fires and wont sink nails depth set deep and pressure over 120 psi

If no air is leaking from gun, miss-fire is usually caused by worn or too tight piston oring or lack of lubrication. Easy test. Disconnect airline, remove nails, point nose of gun up then down. Driver should stay in uppermost position. If driver moves up then down within gun replace piston oring and retest. Set pressure to about 100psi. Good luck with repair.

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Why does my roofing nail gun jamming, it would fire one nail and the hammer will remain out, so i toke a screw driver and push the hammer back in, and it still did the same thing

Simple test for piston jam. With nails removed and latch open, point nose of gun up then down. If the driver slides up and down in the cylinder as you move the gun, replace the piston oring (test gun for proper operation). If the piston stays in the upper most position as you move gun (push driver to top position), check lower bumper and bottom seal under the bumper (sheet). Replace as needed. If the lower parts are in good condition (good piston oring, lower bumper and sheet) , replace the 3 orings on the feeder piston. Good luck

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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

Nail gun wont drive nails..just makes a weak popping sound

Popping sound indicates stuck driver or worn trigger valve. Remove the head and pull out the driver. The driver should fit snugly in the cylinder. Replace the piston oring if the drrver drops down the cylinder under its own weight. Check for bent or broken driver and replace as needed. Lube cylinder with silicone paste lube or nail gun oil. Check that the headvalve is not stuck in the head and lube as needed. Replace head and test. If no joy, replace the trigger valve. Good luck.

Aug 21, 2011 | Stanley Bostitch Stick Framing Nailer...

2 Answers

I can get he gun to shoot 1 nail but won't load the next nail?

There is a small piston on the side of the magazine that pushes the feeding claw which pushes the next nail into place. Either the feeding claw or piston is stuck or the piston is worn out and needs to be replaced.

Sep 30, 2010 | Stanley Bostitch Coil Framing Nailer

1 Answer

Aaair leaks out of trigger on paselode phneumatic framing nail gun and wont fire nail

Are you using air tool oil before each use? The air coming into the gun may have water and other debris along with it. Try installing an in-line filter in the hose. Remove the head and try to push the piston down to see if it is stuck. Hope this helps!

Aug 15, 2010 | Garden

1 Answer

Not firing right

the nail return spring for the piston is stuck or broken,dis mantle the gun and clean and check the spring to see if its broken

Apr 06, 2010 | RTO PasLode 900420 Impulse Framing Nailer

1 Answer

Gun stopped driving nails, air escapes from top,

has the gun been cleaned and oiled, i think not.

take the head bolts out of the top of the gun. make sure you pay attention to how everything comes out so you can put it back together.

shake the gun upside down so that the piston comes out. wipe everything down with any petroleum based cleaning solvent to remove all the gunk and reassemble.

pour about 10 dropsof oil down the air input, let it sit there about 5 mins and hook up the air and it should work

Sep 23, 2009 | Tools & Hardware - Others

1 Answer

Stuck driver hitachi roof coil gun. how to fix?

Disconnect the air. Can't stress this enough.

Turn it upside down and find the bottom of the piston. Use a punch or a short piece of solid rod and gently tap the piston back to the home position. You may have to pry and/or pull out a mangled nail in the process.

After this, be sure to put some oil in the intake as this is one common cause of jams like this.

If it's an older nailer, then it probably was built for a different angle on the nails than what is currently available. I have one like this. It will do fine 99.9% of the time with 1 1/4" nails but does very poorly with longer ones. There is really nothing you can do about this unless you find some old nails. If you can find hot dip nails they seem to do better than electro-galvanized as well - they also last better but are more expensive.

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