Question about Dewalt Heavy - Duty 31° Clipped Head Framing Nailer - D51822
Generally, when you attempt to fire and only get an air sound at the trigger, the problem is air leaking past the orings in the head valve. Here are a few things to check and a simple test.
Remove the trigger from the gun so that you can have access to the trigger pin. Remove the nails from the gun. After removing the trigger and the nails, reconnect the air supply (check for 100psi) Place the nose of the gun against wood and with a very quick ****, depress the trigger pin all the way in. If the gun fires then the safety foot is not allowing the trigger to depress the pin all the way in. Make adjustments to safety and check for worn trigger and trigger retainer pin. If the gun does not fire, remove the head. Place the head on table and depress the headvalve all the way in with your thumbs then place a finger over the small vent-hole on the gasket surface and release thumb pressure. The headvalve should remain depressed due to vacuum in the valve and will pop up when you remove your finger on vent hole. If the headvalve does not stay in, air is leaking past the orings. Remove headvalve parts and use magnify lens to find small scratches on the surface where orings contact. Remove scratches with very fine sandpaper (300 - 400 grit) Make sure all the orings are not cut (use magnify lens) and fit snuggly. Lube with "Danco silicone grease" available at lowes in the plumbing department. It is used to lubricate orings in faucets. After re-assembly, do vacuum test as described above. If you have vacuum, head is ok. Make sure that the gasket seals around the vent hole where the head mates against the body. You should be good to go. Good Luck and email if you have other questions.
Posted on Mar 05, 2009
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