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Dewalt D51822 framing nailer shoots automatically when hooked to air without bumping and pulling trigger

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These nailers are infamous for having trigger valve problems,,,replace it and it should work,,,,ereplacementparts.com is a good place to get one

Posted on Apr 27, 2014

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Posted on Jan 02, 2017

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SOURCE: DeWalt d51822 framing nailer, shoots 2 nails at once 1 in 5 times

I worked at at tool rental center while attending college and learned from the old tool masters about nails and nailers. Rental stores have many different brands of nailers to rent and customers would bring their own nails of all brands. You will notice on the case/box that your nails will /should work on many other brands however the degree or angle of the nails is not always exacly as stated on the box. You should check with protractor the exact angle of your nails and also check the exact angle of the nailer. Use straight edge on travel path of the piston and another on guide rails to check angle of the gun. You will discover that all is not as stated as in a perfect world. If the angle is off slightly, the head of the second nail will get into the path of the driver. This happens mostly with clip head because the nail heads are so close together. The full round head is spaced further apart with less jamming. If angle is off slightly, take a look at other brands of nails with protractor in hand, the angle will be different slightly or choose a slightly thicker nail. Look for the nails to fit with bottom of nail hitting the barrel first. This will move the head of the nail slightly away from the center line. Finally do not release pusher with force as this will jamb nails closer together. Good Luck!?

Posted on Jun 18, 2009

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SOURCE: paslode framing nailer won't shoot

Take 4 bolts off of head . Clean and lube head valve with air nailer oil. Not wd40

Posted on Apr 14, 2009

  • 1383 Answers

SOURCE: DeWalt D51822 Framing Nailer: Replaced the trigger valve and air is still coming from the nose of the gun. I would think no air should get past the trigger valve until pressed. What's wrong?

Dewalt framing nailers use some vinyl orings (gold or clear in color) that fail too soon in both the trigger and the cylinder spacer. Air out the nose of gun indicates air is leaking past the cylinder spacer seals (If piston is pushed down with air leak then headvalve seal is leaking (remove nails for this test)). If piston is not pushed down with leak, remove head and pull out the cylinder with cylinder spacer (white plastic). Place the cylinder on workbench with bottom up. Push down on locking ring and remove retainer to release all the other parts. Take picture or take note of parts together and as you pull them off to aid in re-assembly. You will need to replace the two orings between the white cylinder spacer and the cylinder. Order oring kit from dewalt or just purchase one ( # 141 universal oring ) and one metric oring 74.4mm x 3.1mm from hydraulic parts store. If the piston was pushed down with air leak, replace headvalve orings in the head. Good luck with your repair

Posted on Jul 21, 2012

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1 Answer

Dewalt framing nailer D51822 type 1


you may have to hand push the anvil back up , using too much air pressure will ever time cause this

Jun 13, 2016 | Dewalt Heavy - Duty 31° Clipped Head...

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Nail gun will not shoot a nail


Check the safety trip make sure it is pushing back far enough. If it doesn't then it won't do anything. When it was fine just moments earlier.

Feb 05, 2013 | Dewalt D51822 Clipped Head 2Inch to...

1 Answer

DeWalt D51822 Framing Nailer: Replaced the trigger valve and air is still coming from the nose of the gun. I would think no air should get past the trigger valve until pressed. What's wrong?


Dewalt framing nailers use some vinyl orings (gold or clear in color) that fail too soon in both the trigger and the cylinder spacer. Air out the nose of gun indicates air is leaking past the cylinder spacer seals (If piston is pushed down with air leak then headvalve seal is leaking (remove nails for this test)). If piston is not pushed down with leak, remove head and pull out the cylinder with cylinder spacer (white plastic). Place the cylinder on workbench with bottom up. Push down on locking ring and remove retainer to release all the other parts. Take picture or take note of parts together and as you pull them off to aid in re-assembly. You will need to replace the two orings between the white cylinder spacer and the cylinder. Order oring kit from dewalt or just purchase one ( # 141 universal oring ) and one metric oring 74.4mm x 3.1mm from hydraulic parts store. If the piston was pushed down with air leak, replace headvalve orings in the head. Good luck with your repair

Jul 05, 2012 | Dewalt Heavy - Duty 31° Clipped Head...

1 Answer

How does the framing nailer work with a black button grey button


Dewalt has two triggers available for their framing nailer. The black trigger (390746-00) is a bump style trigger. While holding the trigger, you will be able to fire a nail by pressing nose against work. This trigger is preferred by most framers because it is much faster. Gray trigger will only allow one nail to be fired. Bumping will not work with the gray trigger. With trigger released, you must place the nose against work then pull trigger to fire. To fire next round, you must release trigger, pull gun off the work, again place nose against work then press trigger. Check dewalt web site for recall information. Some dewalt framers have been recalled for faulty trigger. Good luck with your projects.

Aug 11, 2011 | Dewalt Round Head Framing Nailer D51845

1 Answer

After shooting a nail, it fires out two more nails.


Dewalt has a new trigger valve to replace the original (part number 5140095-73). Not sure if the new valve is replacement to address an issue or natural progression. I would also replace the orings that make contact with the reference #55 on parts list called the bulkhead. There are four orings contacting the bulkhead that wear and may contribute to multi-fire. Parts are at dewalt service center or at www.toolpartsdirect.com Good luck

Jul 30, 2011 | Dewalt Heavy - Duty 31° Clipped Head...

1 Answer

Dewalt D51822 nail gun does not fire nail. When trigger is pulled air can be felt coming from the trigger area. I have replaced the trigger valve assembly and it had no effect. Gun is about 3 years old...


There are 4 orings that cause this problem. Two are in the trigger valve installed on the firing pin. The firing pin can be seen just under the trigger, however if you replaced the valve, you could assume no problems with the trigger valve. I would take apart the old trigger valve and examine the orings on the pin. The pin should fit snugly in the trigger valve cap and also in the valve. If the orings look good and it does fit snugly, most likely valve is still good. The other two orings to suspect are installed on the cylinder inside the nailer and make contact with the bulkhead (white plastic piece that seals the cylinder note parts reference 55, 74, 11 on the parts list). For parts list and to order parts go to www.toolpartsdirect.com Good luck with your repair.

May 26, 2011 | Dewalt D51822 Clipped Head 2Inch to...

1 Answer

D51822 framing nailer - worked just fine for a couple of hours then refused to fire nails. Pulling the trigger now results in a small puff of air. Current air pressure is set at 100 PSI. I have not used...


Yes your problem right about lubericatoin try putting lite oil in it hopefuly you didn,t taer one of the seals but if you did just standard o rings and you can get them at a hardware store and the gun is easy to rebuild

Nov 29, 2010 | Dewalt D51822 Clipped Head 2Inch to...

1 Answer

Dewalt D51822 leaks air


its a seal leak, but if it's under warrenty, send it back

it's not worth voiding the warranty by doing it yourself

Dec 09, 2009 | Dewalt Heavy - Duty 31° Clipped Head...

1 Answer

I've got the: Dewalt Heavy - Duty 31° Clipped Head Framing Nailer - D51822 As soon as I hook up the hose to it there is a leak some where. It's faint but makes my compressor kick on immediately. I...


Don't know if this will help you but here goes. I have a Bostich nailer and had to replace the check valve under the trigger.(at least it acts like a check valve, stops air loss when disconnecting gun from hose) It was leaking badly and had to remove trigger to replace the kit. You can do it yourself like I did or take it in to a shop. I carefully punched out the roll pins, replaced the kit after greasing the o-rings with lubricant that was supplied with kit and replaced the trigger.
Good luck

Dec 09, 2009 | Dewalt Heavy - Duty 31° Clipped Head...

1 Answer

Dewalt 51844 round head nailer


Could be a couple things, the seal ring on top of the cylinder or a cut oring or just a faulty trigger valve assembly. I would take it back and have the repair shop correct the problem for you at NC. Let me know if still a problem and I will look at a schematic and give you part numbers.

Feb 17, 2009 | Dewalt Heavy - Duty 31° Clipped Head...

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