Question about Chicago Pneumatic Industrial CP4444 - RUTAB Standard Riveting Hammer

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I need to replace the O ring in the trigger assembly where can I get one?

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Most automotive supply stores carry o-rings ... fialing that you can buy a kit in most of the automotive stores or any hydraulic repair shop

Posted on Mar 28, 2011

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1 Answer

All the sudden the nail gun stop working, pull the trigger air leaks out at trigger area


I had a similar problem with one of my nail guns. What I found was a small rubber o-ring in the trigger mechanism had split. Once I replaced this the problem was corrected and the unit functioned fine.

You could replace the whole trigger assembly for about $35. But if you remove the assemble and replace the split-ring this would only cost a couple of bucks at most.

Trigger assembly shown below. ereplacementparts.com is one possible source for the trigger assembly others can be found on the Internet.

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Aug 21, 2011 | Dewalt Heavy - Duty 31° Clipped Head...

1 Answer

Air is streaming out of the trigger mechanism.


I dont think it is your piston assembly, there is an o ring on the trigger valve assembly that is broken and would need to be replaced, If you need help getting it out let me know and I will guide you thru it. But while you have it apart look for worn o rings and now might be the time to replace them.

Feb 20, 2011 | Stanley Piston Driver Assy Bostitch N60fn...

1 Answer

Have framing gun with split neoprene seal( TVA-11 Valve). What is the scam that we have to buy a thirty dollar valve kit as opposed to a thirty cent o-ring. This seems to be a scam. Bostich N80 SB


If the o-ring is the problem, you can get the o-rings separately. I believe that the o-ring kit runs about $12 and contains all of the rings. If hte problem is internal to the trigger assembly, the entire assembly should be replaced. I have replaced the o-rings twice and the trigger once in my N80 in 24 years of service .

Dan

Jun 13, 2010 | Stanley Air Tools & Compressors

1 Answer

Air coming out behind trigger.will sink nail


there is a split o ring on the trigger assembly that needs replaced or the whole trigger valve assembly needs replaced.

May 22, 2010 | Stanley Bostitch N86S 1 Factory...

1 Answer

Air leaking aroung the trigger assembly from my Hitachi NR83A


if you took the trigger apart the part that you unscrew has a nylon ball and a black rubber ring you should check them and make sure that you didn't loose them when you took it apart,if they are there, then you need to service the gun, and after you clean all the moving part and you put it back together, it may still leak from the top,Take a rubber hammer and give it a good hit,now not to hard, and it should seal

Apr 27, 2010 | Hitachi NV45AB2S Coil Roofing Nailer

1 Answer

Leaking air by trigger


I can assume this is a Bostitch tool and if so there is an o ring cracked on the trigger and the assembly would need to be replaced. You can go to Bostitch.com with your model number and order the replacement valve assembly. Let me know further and I will give you detailed instructions on how to remove.

Jan 03, 2010 | Air Tools & Compressors

1 Answer

I need help replacing a bostitch framing air nailer trigger model 28ww it's leaking air and won't work.


follow closely, do you have a new trigger assembly because the problem is with one o ring commonly referred as the purple o ring in the kits? either way the procedure to remove the trigger is first knock out the roll pin for the trigger latch and then the 2 roll pins for the trigger assembly. next get a shop rag or equivelant and place under the now exposed trigger assembly and then while holding the collar on the air chuck plug into tool and hold rag tight and trigger will "pop" out pull the chuck away and remove the 2 pins to disassemble the assembly or install in reverse order lubricating the o rings first. Let me know if you have any questions or problems.

Nov 22, 2009 | Stanley Bostitch F28WWMCN 28° Industrial...

1 Answer

Air comes out above trigger. Gun looses all pressure through here.


the o ring on the trigger valve is broken, if you can find a local repair shop ask them for a purple o ring from a rebuild kit or you will need to replace the trigger valve assembly.

Oct 28, 2009 | Stanley Bostitch N86S 1 Factory...

1 Answer

Myn60fn is leaking from around the trigger, do I have to take the whole thing apart to replace the o rings or do I just drive out the spring clips?


You will need to remove the trigger before driving out the roll pin. After you remove the trigger and roll pin, place a rag over the trigger, remove your hand from the area, and briefly hook up your air line. (Clean your soiled pants after this part) You will hear a loud pop and the trigger assembly is going to come out quickly. If you are not prepared for this it will scare the **** out of you. Then once you have the trigger assembly out you can push the two retaining pins on the assembly out and remove the inner workings of the trigger. One note of caution. The ring you are trying to replace is a hard half moon looking ring that Bostitch doesn''t sell separately. You may see it in pieces when you take this assembly apart, or you may not. Sometimes it crumbles and comes out of the trigger exhaust. You can try to match up an oring to sit in there, but from experience it is much easier and less costly to just order the whole trigger valve. Hope this helps.

Sep 29, 2009 | Stanley Bostitch N88rh Framing Nailer...

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