Question about Senco Air Tools & Compressors

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Senco air free wont fire

Nailor builds up and when just about to fire it cuts out

Posted by Anonymous on

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  • Senco Master
  • 1,774 Answers

Maybe A cilinderseal exacly on top of the cilinder is insecure loose on the top instead of tight , it look likes he is blowing air out by the trigger instead to drive the piston . the most types airnalers have a valve insite the top of the top cover this may also be cleaned (solvent) and so that the parts can move free inside.

Posted on Oct 26, 2015

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Posted on Jan 02, 2017

  • 1383 Answers

SOURCE: Senco SFN1 wont work

I have worked on many sfn1 with the problem that you describe. Here are a few things to check. Driver/piston too tight or too loose in cylinder or bent. It should be relatively easy to move the driver piston up/down the cylinder. Usually it should hold it's own weight and not drop down the cylinder. There is a washer that should be at the bottom of the gun under the bumper (washer part# bf0070). This washer must not be worn to the point that too much air will leak past or missing. Finally there is an oring that controlls return of piston (part # lb0077). Pull out the cylinder and find it located on the outer part of the cylinder close to bottom. Clean the port holes under the oring and make sure that the oring fits snuggly. Do not use oil in this gun. Oil will swell the rubber parts. I use silicone lube available form Lowes in the plumbing department. The grease is used to lube faucet orings. Good luck with your repair and email if you have questions.

Posted on Mar 16, 2009

efs_perpends
  • 1996 Answers

SOURCE: Senco staple fastener not firing.

Make sure you actually removed the entire broken staple and there's not a piece still wedged up in there somehow.
Try raising the air pressure up to 125 psi and plug it in and unplug it a few times. Sometimes the piston can get jammed, and a smack with the palm of your hand on the side of the cylinder will jar it loose. If that doesn't work, try pulling the trigger as you jam the nose of the gun against a soft piece of 2x4 or something, repeatedly firing and jarring the tool. If this doesn't do it, you may have to open it up to clear the jam and put it back together.

Posted on Apr 07, 2009

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Senco staple fastener not firing.


Make sure you actually removed the entire broken staple and there's not a piece still wedged up in there somehow.
Try raising the air pressure up to 125 psi and plug it in and unplug it a few times. Sometimes the piston can get jammed, and a smack with the palm of your hand on the side of the cylinder will jar it loose. If that doesn't work, try pulling the trigger as you jam the nose of the gun against a soft piece of 2x4 or something, repeatedly firing and jarring the tool. If this doesn't do it, you may have to open it up to clear the jam and put it back together.

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Senco SN4 misfiring intermittently


This is a discontinued tool by Senco but there are still parts available for it. It sound to me that the o rings and possibly the firing valve need to be replaced. I would recommend going to Senco.com and you will find a complete parts diagram in their discontinued tool section. They also have a toll free number if needed and you can talk to their air pro. I have rebuilt quite a few of these and they are not that hard just make sure to clean all the parts and use lube when replacing O rings.

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