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Have you disconnected it from the air source and deep cleaned the nail gun? Sometimes even a tiny bit of dirt can block the rails the rod runs in. Once cleaned add a small amount of oil to the rod runners.
Use 34 degree, paper collated, clipped head nails. They were always the most common strip nails years ago as Senco, Paslode, and a number of other nailers used them.
Over time debris enters the gun and scratches the metal and plastic surfaces where orings seal against. These scratches will allow air to leak past. Remove the head and pull out the head valve. Examine the metal surface with magnify glass where the headvalve oring makes contact. Remove scratches with 400 grit paper. The surface must be smooth and the oring must seal snugly. Apply silicone paste lube on all surfaces and orings (available at Lowes in the plumbing department and swimming pool supply). Also check for scratches around the body of the gun were the cylinder plate is installed around the cylinder. The gun will not work properly will small air leaks. Remove nails and listen for leaks thru the nose of the gun. Repair as needed. Good luck with your gun.
Remove head and check seal between headvalve and cylinder. If seal looks good, just remove head parts and clean/lube. Also clean/lube orings between cylinder and body of gun.
if thats a hitachi nr90ad, then you should be using 30 degree paper taped clipped headed nails,, never use plastic or wire collated nails in that gun,, some boxes might say 30 up to 34 degree and thats fine, also in a lot of areas clipped headed nails are no longer code, so they made the nails full headed, the head is just off set,,
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