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

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Roofing nailer not working

The plunger that forces the nail out is not returning for the next nail

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This problem is usually caused by two separate issues. Part # 631568 plate seal which is below the bumper and prevents air from leaking out the nose of the gun and forces the driver up. There is also the check seal which is a series of small holes drilled into the cylinder. These holes will be covered by orings or rubber band. Remove the head and pull out the cylinder, replace orings or band as needed. Good luck

Posted on Apr 02, 2015

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

Posted on May 25, 2009

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Plunger will not return on D 51823 nailer


Likely a nail jammed in the chute. The front of the nailer opens so you can pull the jammed nail out.

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If gun firing but nails not being driven could be one of two basic problems:
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Empty magazine, does follower move to top of magazine. Push gun against work piece, does fan motor start? Yes - jam in magazine or lock out bar not operating. (this would allow nail un to fire when out of nails)
2. Piston/driver not returning fully after firing, hence driver blade on top of next nail instead of behind it. This could again be caused by a jammed nail or just a nail head. Another case of not returning is the combustion chamber not making a good seal, check O rings on framer (they are steel rings on bradders) it may just need a good clean it is surprising how dirty they can get and if not cleaned a build up of dirt could break a seal. If not been cleaned for a long time worth checking piston rings, worst case scenario dirt builds up around the rings and stick fully in requiring new piston if the rings will not come out.
Nail guns work on the principle that an explosion pushes the piston driver forcing a nail into the work piece, after the explosion a vacuum is created and it is this that 'sucks' the piston/driver back up the cylinder.

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When firing nailer first nail shoots good but next nails head will get stuck between the push rod chamber. push doesnt seem to return fully top when nail is cycled.


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Air leaks around green cylinder at trigger area and nail plunger will not retract. this is a stanley bostich rn45b nailer


Your nailer uses a trigger valve (part # tva6 cost about $20) and is sold at www.bostitch.com or generic valves sold on ebay . If you have a source for orings, you could try to repair the valve. Remove the roll pin that holds the trigger to expose the tva6 valve. There are roll pin/pins that hold the valve in just above the valve in the body. Remove these pins and apply air pressure to gun to pop-out the valve. Use caution when you do this. Remove nails, lower pressure to gun and use glove or rag to catch valve because it could come out with force. With tva6 valve in hand remove two pins that hold valve together and remove inner plunger. The middle oring on plunger is cause of leak. Try using an oring about same size as the broken seat. It must fit pretty tight to work. If you had a small leak it could be that the firing pin orings fit too loose or just too worn. Use silicone lube or oring lube on the orings and the valve port. Good holidays.

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1 Answer

GT90CH fires but no nail after twenty shots.


a bit of air tool oil might help, make sure you are not getting condensation in the line, otherwise you may have to dissassemble to clean

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