Question about Dewalt D51844 Framing Nailer

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Dewalt d51844 framing nailer will not fire

Replaced o-rings and the gun still will not fire nails

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Posted on Jan 02, 2017

  • 1383 Answers

SOURCE: 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

Posted on Feb 25, 2009

H2_Brad
  • 425 Answers

SOURCE: My dewalt framing gun d51844, the piston was not

What air pressure are you using? You should be using between 90-110psi. Too low and it will not allow the driver to return.

Posted on Mar 06, 2012

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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


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

Apr 25, 2016 | Dewalt Round Head Framing Nailer D51845

1 Answer

Air leaking around trigger


Bad O ring in gun most likely. Usually happens on mine in the fire/reload phase. If its an oil lubricated gun give it a squirt of 3in1 if that doesn't help it will have to go to the repair place..

Dec 29, 2013 | Dewalt D51844 Framing Nailer

1 Answer

Air comes out the nose of my dewalt framing nailer


Again sounds like blown O ring give it a squirt of 3in1 oil and fire it several times (if oil is compatible in your gun). Repair center if that doesn't work. Trash can also get in the air orifice and stop moving parts from moving.

Dec 07, 2013 | Dewalt Air Tools & Compressors

1 Answer

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

Jul 15, 2012 | Dewalt D51844 Framing Nailer

1 Answer

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

Jun 26, 2011 | Dewalt D51844 Framing Nailer

1 Answer

Dewalt Nail Gun D51844. Same problem as other guy - air blowing out with trigger off. Taking it apart, not sure the cylinder comes off, seems to be held in by a hard plastic housing - called a Bulkhead. ...


Dewalt uses about 4 or 5 orings within the gun made of semi clear urethane that fail (turn gummy and breake apart). Two are under the bulkhead and at least two in the trigger valve. To remove the bulkhead pull up on the white housing. With housing and cylinder assembly out, push down on the black retainer at the very bottom and remove the oring(take a picture of the assembly after each stage so that you can re-assemble the spring and checkvalve correctly). You will find two large orings under the bulkhead against the cylinder that need to be replaced (also the orings in the trigger, or replace the trigger valve ).

Jan 01, 2011 | Dewalt D51844 Framing Nailer

1 Answer

I have a dewalt d51844 nail gun. It blows air out the area around the nail even with trigger off?


Dewalt uses two vinyl orings against the cylinder spacer seal. Most likely one or both have have failed. These orings are included in the repair kit available thru dewalt service center near you or on the web. If you have a source for orings, like a bearing retailer, you could replace with generic viton orings. Take cylinder and cylinder spacer with you so that you can fit them in. The orings should allow cylinder spacer to fit snuggly and allow the spacer to have about a 1/4 in travel without jamming. If a kit is not available, then only option is to convert to generic orings. Good holidays

Oct 07, 2010 | Dewalt D51844 Framing Nailer

1 Answer

For the Dewalt d51844 can you use PAPER or plastic collated nails


Yes you can generally interchange the two (paper vs plastic collated) as long as the nails meet the specifications (and collated angle) specified by your nail gun.

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Apr 01, 2009 | Dewalt D51844 Framing Nailer

1 Answer

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

Jan 25, 2009 | Dewalt D51844 Framing Nailer

1 Answer

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

Dec 05, 2008 | Dewalt D51844 Framing Nailer

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