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Nail coil advances about half the time in D51321 Dewalt

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Check the spring on the feed pawl and also the door, you might want to check the positioning of the magazine for the nail size. What you can do it "dry fire" the tool by removing the nails and open the door and holding the nose to a block of wood check for the proper operation of the feed piston, it is possible that it is not retracting/advancing to move the nails. Let me know and I will try and help further.

Posted on Oct 06, 2009

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1 Answer

Air leaking behind trigger


I have noticed that Dewalt uses some vinyl orings in the trigger and the interior of the nailer that fail with time no mater if the gun is used or not. Vinyl orings will soften over time and will need to be replaced. I use buna or viton orings available from many suppliers including (oringsandmore.com). You will need to carefully measure for correct size. I use 2mmx 1.5mm orings on the trigger stem. Good luck

Dec 20, 2012 | Dewalt D51321 3/4" 1 3/4" Heavy Duty Coil...

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

After several years of reliable service my dewalt 708 has become very noisy. The belt tension is correct and the brushes are ok.


what I would recommend is removing the belt and running just the motor. I think that the bearings on the armature are seizing up and creating the noise. The fan bearing is hard to remove. Let me know if this is the case and I will give you directions on how to do it.

Mar 15, 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

Hi my dewalt 708 lx sliding mitre saw, 110v, seems to only have half the power(speed) that it should have, and cannot cut timber on a compound cut because of this, any suggestions please.


I have heard complaints that this saw does not do well on angled cuts because of its low power. Try running a shorter and/or thicker extension cord and checking your input voltage. That's about all I can think of, hope it helps.

Mar 12, 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...

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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