Question about Dewalt D51844 Framing Nailer

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Remanufactured unit I just purchased a remanufactured d51844 nailer. As soon as I connected it it began to vent all the air out of my tank. I checked the unit out for a while and noticed the plunger (hammer) extended so I pressed it back into place with a thin mtal rod. as soon as I connected the air supply, without hitting the trigger, the plunger again extended. It doesn't fire , but slowy pops out. Is there something I can do, or should I just send it back to the merchant?

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The problem that you describe occurs when the headvalve is not contacting and sealing against the cylinder. Mosty likely the gun is suffering from a lack of lubrication from sitting in some hot warehouse. You could try following the instructions in the manual as to lubrication but hold the gun in a position that would allow the oil to fall into the head area. Secondary problem, if the nailgun appears to be well oiled already, it could have swollen orings caused by using too much of the wrong kind of oil. If the orings swell in the headvalve, the headvalve cannot travel freely. ENJOY

Posted on Dec 07, 2008


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Posted on Jan 02, 2017


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disconnect air and pound up the driver blade with a punch and nail should fall out.

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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

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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...

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Jul 15, 2012 | Dewalt D51844 Framing Nailer

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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

Constant air flow out of the tipI have replaced the trigger valve and checked all o rings none seem to be bad.

Here is the thing cant always see a bad 'O' ring there not expensive can be picked up at just about any hardware store replace the 'O' rings. The only other thing it could be is low pressure going into the nailer. Please give a 4 THUMBS UP if this free answer has helped you in anyway. Good Luck and have a Great Day.

Apr 02, 2010 | Dewalt D51844 Framing Nailer

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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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