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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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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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

I have a bostitch model #N88RH. It won't drive nails all the way down. How do I adjust it?


Using the web address below for reference, item number 46 is a small slider button on the nose of your gun. Push in on the slider and adjust the safety nose up into the gun for setting the nail deeper into the work. Good luck on your projects

http://www.ereplacementparts.com/bostitch-n88rh-pneumatic-stick-nailer-parts-c-29443_29458_29650.html

Jun 03, 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

Nail is jammed in my Bostitch power finish nailer and partially sticking out. When pull on nail with pliers, it won't come out.


Remove driver guide nose peice, should be a couple of alan screws, remove nail, check driver to make sure it is not bent, re assemble. Make sure you are using the correct Nails!

Aug 27, 2010 | Stanley Bostitch N88rh Framing Nailer...

2 Answers

Framing gun not firing leaking air aroung trigger


You have a crumbled trigger seal. You can order a new trigger valve through bostitch. It usually takes a couple of weeks though.. Every time I order one it is on backorder. You will need to order trigger valve kit part number TVA11 $21.40. Go to the Bostitch website click on Schematics and Parts to the left then find your model nailer in the search field and select item 53 when the parts list comes up. Click add to cart to order. Another screen will pop up and ask you if you want to checkout. Any questions please post back.

Oct 15, 2009 | Stanley Bostitch N88rh Framing Nailer...

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