Question about Senco Air Tools & Compressors
Nailor builds up and when just about to fire it cuts out
Posted by Anonymous on
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
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
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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