Question about Senco FP18 FinishPro 18 - Gauge Brad Nailer, 5/8" - 2"

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Senco SNII+ and SFNII

Each of these guns had a bad firing valve but after getting new ones I cant get them on. Should i heat the new oens?

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Posted on Jan 02, 2017

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SOURCE: Senco SLP20 not working

Senco makes a line of nailers including the slp20 that use a firing valve (part # ba0119) that fires piston when trigger is depressed. These guns do not use oil because the oil will swell the rubber parts in the valve. When the rubber swells and tears slightly, symptoms that you describe will develop. Also remove the cylinder and look for cracks and make sure that the lower oring (LB0030) is in place and that tiny vent holes are clean. The lower oring is the checkvalve and causes the piston to retract. Use only the slightest bit of silicone lube on orings. Parts are available at www.toolpartsdirect.com. Good Luck

Posted on Jan 22, 2009

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SOURCE: Senco nail gun was working one minute and then died...

gun nails frist nail then does not set next nail

Posted on Sep 02, 2009

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SOURCE: The Senco SFN-1 gun will drive one nail and then not retract

sounds like time for a rebuild i do this once a year on all of my guns i buy a seal kit and replace them at that time and oil the interior oparts and check for worn or broken parts

Posted on Sep 03, 2009

  • 497 Answers

SOURCE: Shooting two nails instead of one

i would double check the plunger to make sure its resetting after each fire.

Posted on Nov 06, 2009

  • 142 Answers

SOURCE: Gun's drive rod not retracting back after firing a nail

you need a top end rebuild kit

Posted on Jan 05, 2010

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1 Answer

My senco sps fires one staple, then hammer gets stuck forward.


If you've had and used the gun since 1998 and never rebuilt it, it's done you well indeed. If the driver is not retracting you most likely have broken or worn o-rings inside the cylinder. Senco makes a rebuild kit, part number YK0376. that contains all o-rings and wear items inside the gun. The kits run about $60 but your gun will be like new again. It's a relatively easy rebuild, just use lots of the Senco grease on the o-rings as you reassemble it.

Jun 05, 2012 | Senco Tools & Hardware - Others

2 Answers

Senco nail gun sfn30 is only firing every second nail in


You have damaged o-rings in the gun. Remove the head cap & valve assembly, remove the ring on top of the cylinder, remove the cylinder & piston. The cylinder is in tight so work it out carefully. Check the condition of the following: a split flat ring with a rubber o-ring under it on the top of the piston and two o-rings on the outside of the cylinder. If these are damaged air will leak around the piston instead of pushing it back up. The inside of the gun should be clean with a light coat of oil on everything if you are oiling it properly before use. Dirt in the gun means the gun is being laid on the ground without the air hose attached. Dry innards means no or not enough oil is being put in the gun before use. Oil pooled in the bottom of the gun means too much oil is being used. Senco doesn't make a rebuild kit for this gun, you'll have to go to the Senco website http://www.senco.com/ or other website like http://www.ereplacementparts.com to get a parts breakdown of your gun and order the o-rings (any part beginning with LB) individually. If you replace one, replace all of them and grease them up liberally when reassembling the gun.

Jan 29, 2012 | Senco Tools & Hardware - Others

1 Answer

Senco sns40 stapler replaced all o rings still leaks air. Even seals in trigger assembly. Leaks out the exhaust port.


Air leaking thru exhaust on sns40 gun is indication of pinhole in rubber diaphragm of firing valve (part #BA0120). This gun is oil-less type and will develope leaks if oil is used. Most likely need to replace firing valve to restore to working order. Parts are at www.toolpartsdirest.com. Good luck

Mar 11, 2011 | Senco Air Tools & Compressors

1 Answer

Air leak top of gun senco oil less coil nailer scw40r. unclehhotmail.comowd@


Nailer scn40r is an oil less coil roofing nailer. If it will not fire and leaks out head then most likely problem is diaphragm torn or pinhole. Replace firing valve part # BAO120 for good as new operation.
Order parts from www.toolpartsdirect.com

Oct 16, 2010 | Senco Tools & Hardware - Others

1 Answer

I just bought a new Senco Nail gun "Washer Firing Valve" Part LB3500 but can't figure how to get it into the groove. Do I need to heat it in hot water so it will "give" a little allowing me to "stretch"...


I use a heat gun similar to hair dryer and get it pretty warm. The part is pretty tough and can be forced on but better to take your time and apply heat. Good luck with your repair

Aug 28, 2010 | Senco Tools & Hardware - Others

3 Answers

I just rebuilt my Senco SN4 nail gun because it leaked air.


I think that you are referring to the firing valve and no it should not be split. I suggest going to Senco.com and typing in your model number fora breakdown for this tool. They offer different kits for various failures. Let me know if you need more help

Nov 23, 2009 | Tools & Hardware - Others

1 Answer

Senco finish nailer not firing nails


firing pin called the driver is probably broken or needs new seals max air pressure 125 psi senco sells repair kits

May 13, 2009 | Tools & Hardware - Others

1 Answer

Senco sn2 air leak around out top only when the trigger is pulled


There is a cracked seal on the firing valve. It looks like it cant be replaced but it can. Look in your parts breakdown .It seals the firing valve to the cylinder

Apr 08, 2009 | Air Tools & Compressors

2 Answers

Senco SLP20 not working


Senco makes a line of nailers including the slp20 that use a firing valve (part # ba0119) that fires piston when trigger is depressed. These guns do not use oil because the oil will swell the rubber parts in the valve. When the rubber swells and tears slightly, symptoms that you describe will develop. Also remove the cylinder and look for cracks and make sure that the lower oring (LB0030) is in place and that tiny vent holes are clean. The lower oring is the checkvalve and causes the piston to retract. Use only the slightest bit of silicone lube on orings. Parts are available at www.toolpartsdirect.com. Good Luck

Jan 22, 2009 | Senco Fastening Systems No.43OOO1N SLP20...

1 Answer

SENCO SN-IV LB3500 Seal leaks air


The old seal was origionally the same as the new one, a white nylon, however over time the seal breaks down and looks like hard wax. The new seal may be installed by heating with hot air gun till plyable and gently streach over lip. While the gun is open, lube with nail gun oil. the piston should not slide down the cylinder under its own weight, if it does, replace the piston oring. Diagram available at senco.com

Nov 25, 2008 | Senco Air Tools & Compressors

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