Question about Stanley Bostitch STB-MIIIFS Flooring Stapler

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Air leaks thru portals on cap after replacing rings and gaskets?

I had air leaks through the air portals on the cap. I shoot one or two staples into floor and it stopped. Now it doesn't stop and the staples don't come out. I replaced all o rings and gaskets according to instructions on o ring repair kit (ORK6) and still the same problem. Can you help?

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  • 14 Answers

Remove the bumper cap and black exhaust hood from the gun. The three screws that hold the plunger to the poppet need to have lock washers and BLUE locktight on them. Clean them totally and reassemble.

Posted on Jan 11, 2010

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Posted on Jan 02, 2017

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1 Answer

Air leaks when triggered and no nail


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Had a few years and never used, then used a few times using about 4 refills on staples. Wnt to use after not using for a week and when the trigger is pulled it only sends a small amount of air thru and...


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I have a Senco Palm nailer. It works but there is a small air leak all the time. I am guessing it is one of the o-rings but not sure which one.


There are 3 reasons an air leak can take place on this tool.

1) Most likely your o-rings are worn.
2) If the leak is coming from between the head cap and the body, at the gasket. The gasket may need to be replaced.
3) Very unlikely, The body is worn where the o-rings contact the housing.

If it is not a gasket problem, open the tool and look at each o-ring. If any are worn, or have a small inconsistency replace it.

Here is a breakdown of Senco's current Palm Nailer.
http://www.senco.com/pdf/us-pc/pc0701_nfa001_11_23_99.pdf

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MY PNEUMATIC STAPLE GUN WON'T WORK/ looses air through firing lever.How do I repair it? Where do I put the oil in?


I would agree with rowdy that the make and model number are essential to getting the right parts - If you have that information, just find a dealer that supports your brand. That being said, air leaking out the trigger area is likely to be an O-Ring or Seal problem. Pneumatic staplers have O-rings and Seals that need to be replaced periodically. Most have rebuild kits available that contain all the O-Rings and Seals that need to be replaced. Many staplers have O-rings and/or Seals on or near the trigger shaft that can wear and allow air to leak out

Mar 11, 2009 | Tools & Hardware - Others

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