Question about Dewalt D51321 3/4" 1 3/4" Heavy Duty Coil Roofing Nailer, 70 120 Psi

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Dewalt D51321 roofing coil nailer shoots double nails about every 15th shot. Also, about 40% of nails are not flush and have to be hammered down - really cuts into time.

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6ya6ya
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Posted on Jan 02, 2017

  • 1383 Answers

SOURCE: nail would not shoot out

The problem that you describe is caused when the driver is not returning all the way back up to the top of the cylinder not allowing the nails to enter into position . You may have one of several problems including worn piston oring, bent driver, worn check valve, worn lower bumper, or low air pressure. Simple test is to manually push the driver blade back to top using a thin piece of metal that fits into bottom of gun. Be sure to disconnect from air supply when doing this. Good Luck

Posted on Jan 08, 2009

  • 1383 Answers

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

rowdy45176
  • 2176 Answers

SOURCE: senco roofing nailer 200r not feeding nails

You have a problem with o rings or the firing valve. I would go to Senco.com and they have a parts breakdown with a list of kits that are available for the tool. They also have a toll free tech support number is you need it.

Posted on Sep 20, 2009

rowdy45176
  • 2176 Answers

SOURCE: I am looking for a owners manual for a Dewalt D51321 air roofing

try going to Dewaltservicenet.com and typing in your model number to download a manual, let me know if you have problems and I will try another route.

Posted on Dec 30, 2009

  • 12104 Answers

SOURCE: My dewalt heavy duty coil roofing nailer seems to

before tearing apart spray gun plunger and shaft with carb cleaner than spray with a spray lube like wd40 sometimes the plunger gets debris on it if still misfiring call dewalts 800 number they can advise of local repair shop and also advise if problem can be fixed by u

Posted on Jan 23, 2010

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Www.dewalt.com


Worn trigger valve orings will cause gun to fire twice, and /or attempting to single fire nail with bump-fire trigger. Easy test, look closely at firing pin under trigger. It should fit snuggly an not move from side to side in valve. If loose, replace valve. If your nailer has bump-fire trigger, do no attempt to place gun then fire one shot because the gun will most likely double fire. Good luck.

Oct 09, 2012 | Porter Cable Coil Roofing Nailer

1 Answer

I have 3 dewalt roofing nailers with all the same problem, driver drives first nail and then the driver remains down, i changed the driver on one and still does the same can someone suggest a fix tks Gary.


Several things to check. Below the bumper is a small plate that should fit snugly around the driver and keeps air from leaking past the driver. The bumper should not be cracked or missing pieces, replace as needed. On the outside of the cylinder below the cylinder seal, there is a row of holes that should have a snug fitting oring, this is the check seal that causes the driver to return (some nailers have a rubber band covering holes). Finally, the driver oring should allow the driver to move easily down cylinder but not allow the driver to fall under its own weight. Good luck

Jun 25, 2011 | Dewalt D51321 3/4" 1 3/4" Heavy Duty Coil...

1 Answer

Not feeding nails correctly


On the side of the nose there is a paw that's driven by a piston to feed the next nail into place. Check that the paw isn't damaged and moves freely. The piston has several o-rings that do wear out or break over time. If they are damaged you will need a rebuild kit for the gun if Dewalt still makes one for this gun. Go to http://servicenet.dewalt.com and look up your gun. There are two types for this model number so I don't know what parts to recommend. If a kit isn't available for the feed piston you should be able to order the o-rings seperately.

Mar 04, 2011 | Dewalt D51321 3/4" 1 3/4" Heavy Duty Coil...

1 Answer

My driver wont return on my d51321


Try cleaning and oiling the slide,and make sure there is no debris on the slide when oiling,use wd 40 and then wipe it clean,then just use the air gun oil on the slide.

Jun 08, 2010 | Dewalt D51321 3/4" 1 3/4" Heavy Duty Coil...

1 Answer

Piston not retracting


First does it retract after unplugging the air and if so I would look at the trigger valve assembly for a sticking plunger. If not then I would look at the firing valve in the cap. Let me know if I can help further.

Mar 24, 2010 | Dewalt D51321 3/4" 1 3/4" Heavy Duty Coil...

1 Answer

My dewalt heavy duty coil roofing nailer seems to misfire when shooting nails. The nails it shoots they come out slow, then it misses a bunch of them. I think the plunger is stuck. How do I get this...


before tearing apart spray gun plunger and shaft with carb cleaner than spray with a spray lube like wd40 sometimes the plunger gets debris on it if still misfiring call dewalts 800 number they can advise of local repair shop and also advise if problem can be fixed by u

Jan 23, 2010 | Dewalt D51321 3/4" 1 3/4" Heavy Duty Coil...

1 Answer

Every second nail is a misfire


Make sure the nailer has some oil in the gun,and oil the slide and the loader.

Oct 13, 2009 | Dewalt D51321 3/4" 1 3/4" Heavy Duty Coil...

1 Answer

Plunger want retract


The hammer could just need to be oiled or you could have blown a seal in the gun which is not expensive to fix around 20.00 . A lot of times when my gun jams on a nail it gets stuck so the hammer won't go down. I just use something thin that will fit on the hammer and take a hammer and just tap it back into place.

Aug 12, 2009 | Stanley Factory Reconditioned Bostitch...

2 Answers

Roofing nailer not working


I dont know this particular piece of equipment but it sounds like a broken return spring

May 25, 2009 | Dewalt D51321 3/4" 1 3/4" Heavy Duty Coil...

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