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Need seal 390140-00 for dewalt D51845 type 1 nailer and can not find one. can you help locate one

Posted by Larry Spencer on


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  • 268 Answers

SOURCE: dewalt 18v drill dc988 type requires switch

Here is a link for a parts diagram for your model. It has the proper part number that you will need.
Hope this helps.

Posted on Sep 08, 2009


Randy Trent

  • 313 Answers

SOURCE: carraige in dewalt nailer

just goto:

download the support manual. You should be on your way

Posted on Sep 08, 2009


John Trevino

  • 1420 Answers

SOURCE: Where can I find a

I have not seen a complete point by point instruction for Dewalt, however the kit # 610773-01 has a sheet with all the part labeled and is fairly easy if you have worked on other nailers. If you have not taken apart a nailer, then search youtube for nail gun videos to get an idea as to what you are getting into. I have rebuilt hundreds of nailers and find that the Dewalt nailers are about a 4 - 5 in complexity. I find that dewalt nailers are faulted with vinyl orings (clear to yellow in color) that fail due to oil/water and heat. Most nailers use black viton orings that lasts much longer. May I suggest posting again with the specific problem that you are having with your gun. Good holidays

Posted on Dec 10, 2010

John Trevino

  • 1420 Answers

SOURCE: I'm trying to order parts for my Dewalt 51845

Have you looked into the recall for D51845? Here is the link:

Maybe you will not have to repair it yourself. Good holiday

Posted on Jan 01, 2011


  • 4 Answers

SOURCE: I am on my third 2" 2 in 1 Staple-Nailer.The first

I am not acquainted the the specific unit you have indicated. However premature seal failure is usually due to a lack of or incorrect lubrication, a contaminated air supply or use beyond the duty cycle of the unit.

Common seals are often available at the retailer selling Campbell Hausfeld products. Of course once you know exactly which part you need they are available online from a variety of suppliers.

Posted on Feb 11, 2011

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1 Answer

I Have A Dewalt Framing nailer and a nail is hung where it comes out, how do I get it out,

Use an Allen wrench to loosen the two or 4 bolts on nose of the gun. Take the plate off and remove offending nail.

Jan 06, 2015 | Dewalt Round Head Framing Nailer D51845

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Instructions manuals dewalt

Parts and manual can be found here:

Good luck with your nailing projects

Aug 02, 2014 | Dewalt Round Head Framing Nailer D51845

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What is bulkhead on pneumatic nailgun

The bulkhead on a nailer is the part that separates the pressure chamber from the lower compartment of the nailer. Usually round center hole for the cylinder to pass thru. The outer shape conforms to the inner contour of the body. Usually made of plastic some are metal and have orings seals or oring surface.

Jun 05, 2014 | Dewalt Round Head Framing Nailer D51845

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My DeWalt D51845 - when you use the sequential trigger it shoots maybe every 4th time you pull the trigger. If you replace the sequential with the bump trigger ever 3rd one shoots 2 nails.

Check this notice and post your question again if you nailer is not part of this recall. Good luck.

D51844 & D51845 Recall Notice Published 06/09/2005 08:49 AM ' Updated 09/29/2011 09:35 AM What is the recall on the D51844 and D51845 about? The contact trip on some of the nailers may not operate properly, which may permit a nail to be ejected with only trigger actuation.

Only nailers with the following date codes are affected:

200203, 200204, 200217, 200302, 200304, 200308, 200315, 200325, 200329, 200343, 200403, 200404, 200406, 200407, 200412, 200413, 200415, 200416, 200417

See the link listed below for illustrations & more information regarding the recall.

Oct 16, 2011 | Dewalt Round Head Framing Nailer D51845

1 Answer


Dewalt framing nailers have several orings made of urethane that lose their capacity to seal over time (gun being used or in storage, orings will fail). Too much or too little oil would not have made much of a difference. If your nailer is a couple or years old, order oring kit and replace the orings that seal the cylinder to cylinder spacer(white plastic between cylinder and body of gun). In the head if the gun there is a stationary headvalve that usually does not fail. On some nailers, too much oil will cause the orings to swell and lock-up(but not leak air). Good luck

Aug 23, 2011 | Dewalt Round Head Framing Nailer D51845

2 Answers

Where can I find a complete and detailed diagram to rebuild a Dewalt framing gun model # D51845

There are 4 types of D51845, and your type number should be found near your model number. Go to this site and on the left is the box you will input your model number, it will ask for the type number, and then it will take you to a parts list. Click on the tab for diagrams, and there you go. I hope this helps, let me know if you have any other questions.

Dec 10, 2010 | Dewalt Round Head Framing Nailer D51845

1 Answer

My dewalt framing nail gun was hooked to the air compressor, but was not being used when it began leaking air which you could hear and got louder. It sounded like it was leaking around the trigger area....

There are O-ring seals around the trigger that are probably leaking. You can try to lubricate the gun by adding the pneumatic oil to the air supply. That may be enough to seal it back up. Otherwise the seals and/or the trigger assembly will need to be replaced.


Mar 29, 2010 | Dewalt Round Head Framing Nailer D51845

1 Answer

Press the trigger and all we get is a puff of air

could be driver stuck with jammed nail or the firing valve is stuck in the head. If this is a Dewalt tool go to and type in your model number for a breakdown before removing the cap.

Nov 08, 2009 | Dewalt Round Head Framing Nailer D51845

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