Dewalt Round Head Framing Nailer D51845 Logo

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Bud Riska
Bud Riska Posted on Apr 25, 2016
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Put air on my D51844 it starts firing nail out i have not touch the trigger what is the problem danger

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John Trevino

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  • Dewalt Master 1,420 Answers
  • Posted on May 05, 2016
John Trevino
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Joined: May 17, 2008
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Dewalt uses a combination buna and vinyl orings. The vinyl orings in their nailers fail by turning into putty. To fix your problem replace the trigger valve or the vinyl orings within. You will meed three orings in the trigger valve, (buna 70) , two rings are 2mm and one is 6mm. Within the body of the gun there are 5 more vinyl orings that fail. The rebuild kit has some vinyl orings and will most likely fail also. Convert to buna for longer life. Good luck

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Anonymous

  • 1 Answer
  • Posted on Feb 06, 2009

SOURCE: Once trigger is depressed, air leaks and no nail is fired....

Sounds like the trigger o-ring is damaged, either because of not being oiled frequently, or the pneumatic tool has not been used for a while. O-rings will harden up if not used. Look for a place that sells fasteners, or nails and see if they can put a new o-ring in the trigger asm. for you. If you take the gun to a place where you purchase your nails, they should repair for little or no cost. it is an easy repair if you have the tools, parts, etc.

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Anonymous

  • 2176 Answers
  • Posted on Feb 06, 2009

SOURCE: Air leaks arond trigger when depressed, but no nail fires.

Where does the air leak out from? If it leaks from the trigger DeWalt makes a trigger valve assembly part # 641006-00 list 8.89 BUT if it leaks from other areas we have to look into it deeper. If it is just the trigger valve let me know and I will give you instructions how to remove and install the new one.

Anonymous

  • 2176 Answers
  • Posted on Jul 17, 2009

SOURCE: Dewalt 51488. Air leaks around trigger and won't fire nail.

Go to Dewaltservicenet.com and download a breakdown of the tool before starting. I would recoment changing all the O rings and make sure that you get a good grease to lube them first. Its not that hard.

John Trevino

  • 1420 Answers
  • Posted on Sep 16, 2011

SOURCE: my framing nail gun won't

Time for oring kit # d518005 available at Dewalt service center or at www.toolpartsdirect.com.
May as well order the replacement trigger valve while there. These two items will renew your gun. Good luck

John Trevino

  • 1420 Answers
  • Posted on Nov 02, 2012

SOURCE: when you pull the trigger air comes out near the trigger and no nail is fired.

The problem that you describe indicates that the orings within the trigger failed. You could replace the orings if you have a source for very small rings (2mm x 1.5 for the firing pin inside the trigger valve) or just replace the whole trigger assembly (under $10). Lube all orings with white grease or silicone paste lube (remove head and lube head valve assembly). Good luck

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Related Questions:

1helpful
1answer

Why does nail gun not fire? Safety works ok. Gun loaded with 2 1/2" finish nails. Trigger safety switch is off. Slight hiss of air when trigger depressed but does not fire.
Hi Charles & Floyd:
Just a couple of thoughts that may assist.
First. This is an air tool so it is DANGEROUS! Treat it like a LOADED GUN.
Here's what I would do:
- Disconnect from air supply - point away from anything I don't want to hurt, and squeeze trigger. Press safety against block of wood and squeeze trigger.
- Now that I know it is safe, I would remove the nails from the magazine and check that none is stuck in breech mechanism.
- Check that feed spring/latch has released. Sometimes if loaded too full it can catch.
- Load some nails, check that they are the correct fit, and are sliding in the magazine.
- check air supply pressure. Should be between 80 and 100 psi.
- reconnect air supply and try again.
- If it does not fire it may be that the piston is not fully retracting. Since it is new, I would be returning it to the store where it was purchased.
Hope this helps.
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Apr 18, 2016 • Porter Cable-Cable FN250C 1-inch...
0helpful
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Replaced all the o'rings and bought dewalt nails but its still not shooting the nails what can I do now?
first of all, you thought it was the orings? why? does it nake any noise( air leaking). make sure, positive, the safety his making contact with the trigger. It goes from the top all the way and makes contact on the bostitch nailers on the back side of the trigger and if its not set allthe way it wont fire. as a repair guy I have found a few to be more odd then others. if you feel comfortable enough to change orings , Ill assume you have had it apart. then take off the magazine an tap out the pin that holds the trigger in, not the valve just the trigger. this way you can bypass the safety and dignose the issue. when you get he trigger out push the button with your finger and air plugged in don't face it toward yourself or have anything over the end. Even with no nails it still hurts a lot when the driver hits you. Trust me on that.
If it still doesn't fire do you have at least a 100psi on the compressor?
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Nov 03, 2015 • Dewalt D51844 Framing Nailer
0helpful
1answer

Dewalt instruction manuals
https://www.manualslib.com/


Here
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Aug 22, 2014 • Dewalt D51844 Framing Nailer
0helpful
1answer

My Dewalt nailer, D51844, has stopped firing. When you squeeze the trigger, air leaks out a little, but it doesn't fire. Its in single shot mode.
If it has a depress style safety it might not be traveling quite far enough to fire.
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Oct 24, 2013 • Dewalt D51844 Framing Nailer
0helpful
1answer

Dewalt D51844. Framing out a wall today and the gun worked fine on the first wall. I was starting the second wall and heard an air leak coming from the gun. Would not stop. Tried several things and...
Most all of my guns are senco and the head has the moving part for fire and reload,, controlling the driver piston. Multiple shots suggests a trigger problem. No water in system right.. Well Its all O rings little ones,, skinny ones,, fat ones etc. You can open it up and check, do the head first, I think.. Its fast a off and on
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Jul 15, 2012 • Dewalt D51844 Framing Nailer
1helpful
1answer

My bostitch N88RH is not firing nails
May occur when headvalve or driver is stuck (will usually make a pop or click when tigger is depressed), or tigger valve has failed or safety not actually touching trigger firing pin. Easy test, remove nails, remove trigger by pushing out 3mm roll pin or bolt to expose the firing pin. Pull back nail feeder and place the nose against piece of wood ~ depress trigger with very quick motion with finger. If it fires, reinstall trigger and adjust safety foot so that the firing pin is pushed all the way in. If does not fire, replace trigger valve (usually tva6) or remove trigger valve and replace the 3 orings on the inner plunger. If you hear a pop or click when you do test above, remove head and lube the headvalve orings with white grease or silicone paste.
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Nov 17, 2011 • Stanley Bostitch N88rh Framing Nailer...
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1answer

When you try and fire the nailer, all I get is a puff of air out around the trigger area and no nailing. The problem started with low power and then finally quit. O-rings? Help Ed
Yes it is most likely the o-ring has gone bad. I would suggest that instead of just buying one O-Ring you purchase the o-ring Kit You can order them Here

You need to look at the model plate and see if you have a Type 1, 2, 3, Or 4
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Jun 26, 2011 • Dewalt D51844 Framing Nailer
0helpful
1answer

My finish nail guns, 16 ga won't fire.
There is a little plastic piece inside above the trigger...usually this breaks. It touches a microswitch when the cylinder is closed all the way, allowing the nail to fire.
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Oct 04, 2009 • RTO PasLode 900420 Impulse Framing Nailer
0helpful
1answer

D51844 Won't Fire Nails
The Dewalt D51844 uses a full round head 20 degree nail. Sometimes the generic brand nails are not made exactly to the stated degree. They do this so their nails will work on a variety of nailers. Best to check the nails angle in relation to the angle of your nailer. Place a strip of nails on the outside of the rail. Align the heads of the nails to a convenient straight edge on the rail then check that the head and shaft of the first nail is aligned with the barrel. If the lower part of the nail projects out further than the head, then the driver will miss the head. If the head of the first nail appears close enough to barrell for the driver to hit it then place a new strip of nails into the mag and slide the pusher foward. Fire one nail, if success, remove the nails from the mag and check if the plastic holding the nails together is projecting in front of the first nail. Sometimes the plastic is not right, too stiff, and will not let the next nail align with the barrell. If the next nail appears ready and slides forward then the driver may not be going all the way up after shot. Check by inserting a metal rod into barrell and push driver up till it stops. If the driver is in the uppermost position, then most likely brand of nails. Use Dewalt nail. Good Luck
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Jan 25, 2009 • Dewalt D51844 Framing Nailer
3helpful
1answer

D51844 Framing Nailer won't fire
Adjusting the depth of the nail also changes the amount of pressure that is applied to the trigger pin. This is not actually a problem with the adjustment, however indicates that the orings in the gun are not completely sealing or is lacking lubricant. Adjust depth so that maximum pressure is asserted against the trigger pin. The trigger pin must be pushed all the way in very quickly to fire the gun. Test by removing the trigger and depressing the trigger pin by hand all the way in quickly. Enjoy
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Dec 05, 2008 • Dewalt D51844 Framing Nailer
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Round Head Framing Nailer D51845

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Why does nail gun not fire? Safety works ok. Gun loaded with 2 1/2" finish nails. Trigger safety switch is off. Slight hiss of air when trigger depressed but does not fire.

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