Question about Dewalt D51321 3/4" 1 3/4" Heavy Duty Coil Roofing Nailer, 70 120 Psi
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Posted on Jan 02, 2017
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
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
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
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
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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