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My Bostitch GF28WW piston assembly won't return, firing pin blocks another nail from being loaded. Help! I've changed piston assembly already and also piston bumper with no success.

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There is something leaking between the valve inside the cap and the cilinder

Posted on Oct 05, 2018

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Posted on Jan 02, 2017

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rowdy45176
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SOURCE: Bostitch RN46-1 roof nailer won't

check the height of the magazine, but I think that you have a problem with the feed piston or there is a spring on the feed pawl that might be broke. Unload the nails and dry fire the tool with the door open observing the piston movement. It should "SNAP" back and forth if it does unplug the air and check to see if the spring that applies pressure to the pawl is broken or missing. I am going to guess the piston. If this tool has not been serviced in a while the asphalt tends to jam up the mechanisms. Let me know if you need more assistance.

Posted on Jun 12, 2011

H2_Brad
  • 425 Answers

SOURCE: My Bostitch N12 won't advance nails

It could be the o-rings for the feed piston but a bad feed spring will also cause problems. that would be the easiest place to try if you can find a spring. Many of the parts for these are becoming NLA (no longer available) from Bostitch. One problem they had in the feed piston area was chipping the nose where the orign seals the piston stem. There is a small bumper on the inside of the feed piston cap that goes bad and allows the piston to travel to far back which slams the feeder against the lower housing and can chip it where the piston goes through.

Posted on May 18, 2012

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1 Answer

I have a Bostitch SEQ4 Coil Nailer. Every time I connect the air to the gun it ejects a nail and then wont fire because the piston has not returned. What is the answer?


SEQ4 is not a Bostitch gun model number it is a part number for a trigger.
It sounds like you have a bad trigger assembly - if you can post the model number I can get you the proper breakdown and part #.

Jan 31, 2017 | Air Tools & Compressors

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Bostitch N80SB won't reset after firing


Most likely just needs piston oring. Remove nails from the gun and point nose of gun up then down again. If the piston travels up and down in the cylinder, replace the oring. The piston returns to top with air pressure and needs good snug piston oring and good lower bumper (if bumper is cracked or missing pieces ~ replace ). Be sure to lube the orings in the headvalve with silicone paste or white grease. Part # ORK11 oring kit will reseal the gun. Good luck with your repair.

Jun 02, 2012 | Stanley Air Tools & Compressors

1 Answer

My Bostitch N12 won't advance nails


It could be the o-rings for the feed piston but a bad feed spring will also cause problems. that would be the easiest place to try if you can find a spring. Many of the parts for these are becoming NLA (no longer available) from Bostitch. One problem they had in the feed piston area was chipping the nose where the orign seals the piston stem. There is a small bumper on the inside of the feed piston cap that goes bad and allows the piston to travel to far back which slams the feeder against the lower housing and can chip it where the piston goes through.

May 16, 2012 | Stanley Air Tools & Compressors

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

The Stanley Bostitch stapler will soot a hole inwood but no staple comes out.


Low pressure or worn piston orings will cause missfire due to the piston/driver not returning to top of cylinder and not allowing pins to move into position. Easy test. Remove airline and push driver blade all the way to top with thin metal or plastic. Test fire. If ok and pressure to gun aprox 100psi, install rebuild/oring kit. If driver was already at top position and the next pin is not aligned with path of driver, check rails and pusher for debris or obstruction preventing pins from moving into position.

Jul 10, 2011 | Stanley Bostitch MIIIFN Flooring Nailers

1 Answer

Bostitch RN46-1 roof nailer won't advance nails into the piston chamber. After loading the nail coil, the first nail fires fine, but the next won't advance. Please help. Thanks!


check the height of the magazine, but I think that you have a problem with the feed piston or there is a spring on the feed pawl that might be broke. Unload the nails and dry fire the tool with the door open observing the piston movement. It should "SNAP" back and forth if it does unplug the air and check to see if the spring that applies pressure to the pawl is broken or missing. I am going to guess the piston. If this tool has not been serviced in a while the asphalt tends to jam up the mechanisms. Let me know if you need more assistance.

Jun 12, 2011 | Tools & Hardware - Others

1 Answer

My Bostitch nail gun just start the end of the gun don't return the start place please help .


remove the piston cover screws and slide the piston out by pushing back the firing pin clean and oil all seals and o rings this area tends to collect dirt and sand and should be cleaned periodicaly

Jan 09, 2011 | Stanley Bostitch Nail Gun

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

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2 Answers

My brad nailer will not shoot any nails. When I press the trigger, I can hear a small puff of air.


it sounds like the piston/driver might be stuck or the firing valve is malfunctioning. there are 4 screws to remove the top cap and you can see if the driver is damaged. Also before removing check to make sure there is not a nail jammed in the nose assembly. This tool is good for breaking the pin on the piston.

Oct 16, 2009 | Stanley Bostitch 18 Gauge Brad Nailer 1 -...

1 Answer

Firing Pin doesn't return


The piston is returned to its firing position by air from the trigger valve after the piston has fired. It relys on the piston sealing against the bumper at the bottom of its stroke, if the bumper was damaged when the driver shattered or it was put in upside down the piston will not return. Also the piston uses air fed into the return chamber from the little holes in the cylinder, if the seal over these holes is damaged the piston may not return. Basically change the bumper and the check seal on the cylinder.

Jul 28, 2009 | Stanley Bostitch Coil Framing Nailer

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