Question about Stanley Bostitch N88rh Framing Nailer Driver Piston 158582

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Bostitch N88RH-1 framing nailer shoots a nail when air hose is connected. I checked the trigger assembly, looks good. Checked the head valve, all the O-rings look good. After 5 disassemblies and re-assemblies, still shoots a nail when air is applied. What's the problem? Thanks, Mark

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  • JEFFrey BAKER
    JEFFrey BAKER May 11, 2010

    hello have you checked the pressure switch on the end of the nail gun ? unless this is pressed in it will not fire no matter what its a safty aspect of the nail gun thats what i'ld start with.

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6 Suggested Answers

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Posted on Jan 02, 2017

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  • 65 Answers

SOURCE: Bostitch Framing Nailer fails in colder weather

the prblem may lie with the oil that you are using
[too thick] or the guide is worn

Posted on Dec 03, 2008

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  • 1388 Answers

SOURCE: nail would not shoot out

The problem that you describe is caused when the driver is not returning all the way back up to the top of the cylinder not allowing the nails to enter into position . You may have one of several problems including worn piston oring, bent driver, worn check valve, worn lower bumper, or low air pressure. Simple test is to manually push the driver blade back to top using a thin piece of metal that fits into bottom of gun. Be sure to disconnect from air supply when doing this. Good Luck

Posted on Jan 08, 2009

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SOURCE: n80sb-1 stanley bostitch framing gun.

Yes your nailer will drive other sizes of nails. For info and parts go to www.bostitch.com 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

comax
  • 154 Answers

SOURCE: bostich nailer N79WWblows continous air

If the nailer is passing air from directly out of the trigger valve, it must be replaced (P/N-TVA11). If it is passing air from anywhere else, (eg back cap or front ) it needs an O-ring kit (P/N- ORK11)

Posted on May 28, 2009

  • 58 Answers

SOURCE: Fires a single nail when air hose is connected

Go here bostich suport page:

http://bostitch.com/default.asp?TYPE=STATICLEFT&PAGE=Support.htm&LEFT=left_support.htm

Posted on Jun 19, 2009

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1 Answer

N88rh bostitch nailer fires first shot without trigger depressing


Worn orings in the gun and the trigger valve will cause the gun to fire upon connecting the air. It is a good practice to remove the nails when you remove the airline until you can replace the trigger valve. I believe that you gun uses a TVA6 valve. It should be replaced when it begins to leak or if the trigger pin seems loose and rocks from side to side. Factory valve costs about 25 dollars and aftermarket sells for about 12 to 18 dollars. Good luck

Jan 20, 2014 | Stanley Bostitch 28 Industrial Framing...

1 Answer

I put a new o ring rebuild kit in my Bostitch N80 sb framing nailer. I replaced every o-ring (including the trigger valve assembly


If the new trigger valve leaks air when you connect the air supply, most likely defective valve or air is leaking past outer trigger valve orings due to debris in the slot or new orings were cut when the valve was pushed in. If air leaks when you depress safety to fire gun then most likely problem is in the head valve or safety foot is not pushing the firing pin all the way in. Easy test, remove nails and remove the trigger to expose the firing pin. Connect air and very quickly depress the firing pin all the way in. If the gun fires, adjust the safety foot as needed. If the gun does not fire, remove the head and check headvalve orings for good snug fit against the cylinder within the head. The surface were orings make contact must be very smooth and not too deeply worn. If you notice fine scratches remove with fine sandpaper. Reinstall head using plenty of white grease on all the orings within the head and retest. Good luck

Feb 10, 2013 | Stanley Bostitch N80CB Coil Framing Nailer

1 Answer

My bostitch n88rh framing nailer will fire when pointed down but wont fire pointed horizontal.


Nailers are made to use in any position so must be something simple to fix. Most likely safety contact foot, to test, remove the nails, remove the trigger to expose the firing button on the trigger valve. Connect air and dry fire onto wood or old coiled rubber hose in various positions. If the gun tests ok then carefully examine safety foot mech. and trigger for loose components missing guide or roll pin. The contact foot must push firmly up on the lever within the trigger thus pushing on the firing button. If the safety foot and trigger are in good conditon and working ok, then problem is within the headvalve and piston orings. To test piston oring, remove airline and nails, point nailer up then down again. The piston should stay in the top position. If the piston moves up /down with movement of gun, replace piston oring. If piston oring ok, remove the head and pull out the headvalve. Apply plenty of silicone paste or white grease to orings on headvalve and reinstall and test. If tests ok, then problem is worn orings in the head /headvalve. You can keep lubing or replace orings. Examine the surface within the head where headvalve orings make contact. If there are many fine scratches, even new orings will not work very well. Try to remove scratches with very fine sandpaper. Good luck

Apr 29, 2012 | Stanley Bostitch N88rh Framing Nailer...

1 Answer

My bostitch N88RH is not firing nails


May occur when headvalve or driver is stuck (will usually make a pop or click when tigger is depressed), or tigger valve has failed or safety not actually touching trigger firing pin. Easy test, remove nails, remove trigger by pushing out 3mm roll pin or bolt to expose the firing pin. Pull back nail feeder and place the nose against piece of wood ~ depress trigger with very quick motion with finger. If it fires, reinstall trigger and adjust safety foot so that the firing pin is pushed all the way in. If does not fire, replace trigger valve (usually tva6) or remove trigger valve and replace the 3 orings on the inner plunger. If you hear a pop or click when you do test above, remove head and lube the headvalve orings with white grease or silicone paste.

Nov 17, 2011 | Stanley Bostitch N88rh Framing Nailer...

1 Answer

My N88rh shoots two nails at a time


N88rh uses a full round head plastic collated nails which are spaced apart enough that the driver cannot hit two nails at once. If your are using other nails that fit into your magazine that are closer together you may in fact drive two nails at once. If, however you are using the correct nail and the nailer shoots twice, then you probable have a very sensitive firing valve. You could change the TVA6 valve or change the actual trigger. To overcome this problem of double firing and you do not want to try changing the firing valve, you need to change the trigger to sequential type instead of bump fire type. This trigger is usually white and will only permit one nail to be fired. Check www.toolpartsdirect.com or bostitch.com for parts. Good holiday

Nov 28, 2010 | Stanley Bostitch N88rh Framing Nailer...

1 Answer

My bostitch n63cp coil framing nailer blows air continuously near the trigger and does not shoot the nail. What is wrong and how can I fix it?


Replace the trigger valve assembly. Part TVA6. It takes just a few minutes. The part will include a pin punchout tool, you supply the hammer.

Jun 28, 2010 | Stanley Bostitch Coil Framing Nailer

1 Answer

N80sb-1 stanley bostitch framing gun.


Yes your nailer will drive other sizes of nails. For info and parts go to www.bostitch.com 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.

Mar 14, 2009 | Stanley Air Tools & Compressors

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