I find that the trigger valves in these guns are reliable and that most problems with random fire is lack of lubrication and adjustment of the safety foot. Assuming that air does not leak when you connect air supply and leaks from trigger when attempting to fire. This indicates a lack of lubrication of the head valve. Remove the head valve and lube with white grease.
Test the gun, of ok then you are done. If no joy, then check safety foot for adjustment. How to test if the safety foot is the problem.
Remove the nails, remove the trigger leaving exposed the trigger firing pin. Adjust air supply to 100 psi and connect to gun.
Assuming no leaks quickly depress the trigger valve pin all the way in. If the gun fires then the problem is with the safety foot and or the actual trigger is not pushing the firing pin all the way in when attempting to fire. Make adjustments accordingly. Good luck with your repair.
SOURCE: PORTER CABLE FR350 FRAMING NAILER RAPID FIRES
I have seen this problem on several brands of nailers. The solution in most cases was to make sure headvalve orings are sealing correctly. Here is a simple test. Remove the head and place on workbench with gasket surface facing up. Push headvalve all the way in with your thumbs then cover the vent hole with finger and release thumb pressure to headvalve. Vacuum should keep headvalve down untill you release finger at vent-hole. If vacuum does not hold, remove headvalve and examine surfaces for fine scratches and/ or make sure of correct size orings (headvalve should be very snug). Remove scratches with extra fine paper (300-400 grit). If headvalve holds, remove headvalve piston and piston stop. With headvalve spring removed, push piston stop into headvalve and make sure that the piston stop fits snuggly into piston. Also make sure piston stop is not damaged or cracked. A loose fitting piston stop will cause multi-fire. Replace as necessary. Upon re-assembly, lube all rubber parts with plenty of silicone lube (not oil, wipe clean all parts before lubing). Silicone paste/grease is sold at Lowes in the plumbing department (Danco Brand). Good luck and email if you have other questions about this gun.
SOURCE: Stanley finsish nailer and air is leaking through the trigger as.
If the air is coming out the trigger it must be replaced. Depending on the model of gun you will have to replace the trigger assembly or various o-Rings. Find a Bostitch dealer in your area and they will supply the parts you require.
SOURCE: Wiil a 22 degree Paorter Cable FR350A Round Head
No... it will fire 21-degree nails and perhaps 23-degree nails (but sont think they exist) and it is a full-head framing nailer so it is designed for firing round head nails. Using clipped nails will likely jam the nailer as these nails are stripped closer together with overlapping heads in the nail strip and the FR350A has a full round driver so you will run into issues with clipped nails. If you are having problems finding full round head nails, you can find them on Amazon to fit this nailer. Otherwise any good tool or trade tool store that sells nailers will likely have a suitable nail supply available for the FR350A.
SOURCE: Dewalt D51822 nail gun does not fire nail. When
There are 4 orings that cause this problem. Two are in the trigger valve installed on the firing pin. The firing pin can be seen just under the trigger, however if you replaced the valve, you could assume no problems with the trigger valve. I would take apart the old trigger valve and examine the orings on the pin. The pin should fit snugly in the trigger valve cap and also in the valve. If the orings look good and it does fit snugly, most likely valve is still good. The other two orings to suspect are installed on the cylinder inside the nailer and make contact with the bulkhead (white plastic piece that seals the cylinder note parts reference 55, 74, 11 on the parts list). For parts list and to order parts go to www.toolpartsdirect.com Good luck with your repair.
Dewalt framing nailers use some vinyl orings (gold or clear in color) that fail too soon in both the trigger and the cylinder spacer. Air out the nose of gun indicates air is leaking past the cylinder spacer seals (If piston is pushed down with air leak then headvalve seal is leaking (remove nails for this test)). If piston is not pushed down with leak, remove head and pull out the cylinder with cylinder spacer (white plastic). Place the cylinder on workbench with bottom up. Push down on locking ring and remove retainer to release all the other parts. Take picture or take note of parts together and as you pull them off to aid in re-assembly. You will need to replace the two orings between the white cylinder spacer and the cylinder. Order oring kit from dewalt or just purchase one ( # 141 universal oring ) and one metric oring 74.4mm x 3.1mm from hydraulic parts store. If the piston was pushed down with air leak, replace headvalve orings in the head. Good luck with your repair
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