Question about Dewalt Heavy - Duty 31° Clipped Head Framing Nailer - D51822

2 Answers

I plug the air in and air comes out where the nails come out

Have put new trigger in

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  • Expert
  • 70 Answers

Morning Tommy,
Have you stripped the head valve down? You probably did the right thing replacing the trigger valve but, look at cleaning the O Rings on the inner part of the valve. It's quite common to find corrosion on the casting which prevents smooth running on the head. Best to try and remove any build up using wet & dry sandpaper - very fine grit though- and re lubricate. Whilst you're at it, check that the O Rings still fit properly. Water can be absorbed and swell them so making a very sluggish cycle.

The most common reason is that water from the compressor's receiver gets into the airline and, eventually the tools on the other end. It's alway's a good idea to drain the tank every Friday when you go home.

Regards
Alex

Posted on May 29, 2014

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  • Dewalt Master
  • 1,383 Answers

Most likely the two orings that make contact with the cylinder spacer (white plastic piece around the cyl.) and the cylinder are leaking between the chambers and out the nose. Pull out the cylinder and remove all the lower parts so that you can slide the cylinder out of the spacer. Replace the two large orings (dewalt uses vinyl orings under the cylinder spacer and they fail). Reinstall using white grease and retest. Good luck.

Posted on May 26, 2014

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Posted on Jan 02, 2017

  • 65 Answers

SOURCE: air never stops coming out of gun nail,and gun doesn't sink nails

strip and clean the gun ,you will find that replaceing the seals will help no end
best of look ian

Posted on Mar 24, 2009

  • 1383 Answers

SOURCE: Brand new unit. Used last weekend, no problem.

Orings /other parts tend to stick when nailer is new. Dewalt uses some vinyl orings that have been causing premature failure. Be sure to add a few drops of oil when used. Too much oil is not good. Wrong oil will cause orings to swell and cause problems such as yours. Your nailer's firing valve can be reset by rapping the nailer against rubber surface such as a thick rugger mat or coiled rubber air hose. Remove airline and nails, being carefull not to damage the head, rap had against rubber mat and retest gun. If it did not reset rap against nose of gun and test. If no joy, you will most likely need to remove head and manually move cylinder up/down and /or check vinyl orings for failure. Before you try to reset the gun, make sure that the safety is pushing the firing pin all the way in. Air removed, look under the trigger as you push down on safey, if it does go all the way in try bump-firing the gun (for test have nails removed). Hold in trigger and quicky /firmly strike gun against rubber pad. Good luck

Posted on Nov 15, 2010

  • 20 Answers

SOURCE: nail gun makes a slight air release sound when

oil real good get a rebuild kit

Posted on Dec 11, 2010

  • 1383 Answers

SOURCE: I have a dewalt d51844 nail gun. It blows air out

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

Posted on Dec 14, 2010

  • 1383 Answers

SOURCE: Dewalt D51822 nail gun does not fire nail. When

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.

Posted on May 27, 2011

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