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Re: LEAKS OUT THE CAP
Did you get it fixed and if not do you have a soft hammer? As long as no o rings were damaged in the installation the cylinder is stuck down and you can usually tap on the cap to draw it up and seat it. You can try this with the air attached. Let me know if you need more help if not already done.
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Glad that you repaired your gun. The piston oring is the only oring in the gun that can have slit and still work fine. It works like a piston ring in a motor. Small ring gap is ok just as long as the piston does not drop down the cylinder under its own weight. The piston oring does not hold pressure, it only reacts to pressure when headvalve opens. When this series of gun leaks air, it is usually due to headvalve orings (lube with white grease), Cylinder seal loose or broken, or trigger valve oring splits (tva6 valve). Good luck
Usually, rebuild kit has a replacement trigger valve. However if you are attempting to rebuild the valve, pay close attention to the fit of the orings where they make contact. The valve has four parts. End cap, lower body, inner spool and trigger pin. The critical orings are on the pin and spool. Replace all the orings, making sure that parts fit snuggly. The trigger pin orings should fit snug against end cap and inner spool. The inner spool should fit snuggly into end cap and lower half of the valve. Good luck with your repair.
Air leaking from the bottom of the gun (path of driver) indicates that cylinder seal orings are leaking (if without nails in gun the driver is slowly pushed down the cylinder when air is connected then cylinder seal is leaking ). Cylinder seal snaps on the top of the cylinder and should fit snug and have no cracks. Easy fix for cylinder ring. Remove head and pull out cylinder. Then remove the cylinder ring (part #n50015). Examine ring for cracks and replace as needed. Examine body of gun where spacer oring makes contact and sand fine scratches. Replace orings as needed. If air is leaking between body of the gun and nose casting, replace gaskets. Good luck.
Apply a generous amount of white grease on all the orings and surface where orings make contact, assemble and apply air for short time. Carefully take apart and look for air tracking on the grease. You will notice that the air has cut path under oring showing you where air is leaking. Sand surface with very fine paper or replace parts as needed. If no tracking is found, air could be leaking past the gasket into vent hole on body of gun (notice hole on mating surface of head /body of gun) or thru the feed piston orings or trigger valve. I find that air will leak past orings if there are fine scratches on the surface where orings make contact (use maginfy glass to examine). good luck and post again if you have more questions.
Make sure no nails in gun. With air connected listen for leaking thru nose of the gun also. If leaking thru nose slightly, air is getting past the cylinder seal oring and/or top of cyl is not seating against headvalve. Repair leak to nose of gun before trying to fix head leak. With no air leaking thru nose of gun, add plenty of white grease to orings in the head (one oring at a time) to see if leak is less and/or grease will streak behind the leaking oring. Then repair as needed. May need slightly thicker oring or sand surface where oring makes contact to remove scratches that are allowing air to pass. Also air can enter the head thru the small port in the gasket leading to the head (make sure that the gasket is sealing).
Easy fix if air is leaking out the top of gun. Remove the head and lube with white grease or silicone paste. If orings seem to be loose, order repair kit from dewalt (you can tighten orings by removing the oring and wind a bit of teflon tape in the oring groove). If air is leaking from the trigger, replace the valve. If air is leaking out the bottom where the nail ejects, pull out the cylinger and lube the orings that seal the cylinder to the body of the gun.
Could be leaking from trigger or in front of trigger at plunger. Spray soapy water on area and determing exact leak. If from trigger pin, remove pin holding metal trigger (3mm roll pin) and check white plastic plunger for oring on groove. If oring is in place then check vinyl ball inside trigger valve bushing. Replace as needed. If leak is in front of trigger at black boot, remove head and replace oring on outer part of cylinder plate (donut shaped plate at top). Good luck
(Remove nails) With short piece of hose used as listening device, check for air leaking out of nose and or trigger area as well (I use a 3 foot piece of fuel line hose to listen for air leaks). Air leaking from various places indicates that there are fine scratches on metal surfaces where orings make contact. Pull out the cylinder and cylinder ring. Look for fine scratches there and in the head where headvalveorings contact metal. Remove scratches with 400 grit sandpaper. Lube all orings and surfaces with silicone paste lube (sold at Lowes in the plumbing department and in swimming pool supply dept.). Check that the cylinder seal sitting on top of cylinder fits snugly on cylinder and is smooth on top. If it spins easily on the cylinder, pull off and apply rtv sealant and reinstall (wait for sealant to mature before use). Make sure that the head gasket seals correctly around small hole leaking to headvalve. Good luck
The most common problem with this nailer is the plastic seal that sits on top of the cylinder. This seal (ususlly white, yellow or black in color ) will cause the nailer to leak lots of air out top of gun. Examine seal for cracks and replace as necessary; the part number is 402725 and is available at www.toolpartsdirect.com This should stop the rapid air leak. After installing the new seal, if you have a very small constant leak out top of the gun then remove the screw holding the headvalve in place and check for small scratches where the orings contact headvalve. Use very fine sandpaper (300 to 400 grit) to remove scratches. Clean and re-use the same orings using silicone grease instead of oil and re-assemble. This should stop all leaks. Silicone grease is available at Lowes lumber in the plumbing department. It is used to lube orings in faucets. If you have more questions about this gun please email, Good Luck