Question about Hitachi NR83A2 2" To 3 1/4" Full Head Framer with Depth of Drive

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The shaft pin on my hitachi nr83A2 strip nailer won't reset, and causes air to leak heavily out of the exhaust. tapping on the cap with the air plugged in doesn't seem to help reset the valve. What else can I do?

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  • Hitachi Master
  • 1,383 Answers

Hitachi nr83 is one of the very few nailers that does not have the firing valve in the head. Instead the cylinder moves within the body of the gun. When the cylinder retracts it rests on the headcap (#877307). If the cylinder gets stuck in the down position, lightly taping on the head will sometimes reset against headcap. If the cylinder orings/contact surfaces are dry/dirty, the retraction spring will not have enough power to reset. Also, if the headcap rubber is cracked or worn the cylinder cannot make a good seal and leak as you describe. Remove the head being carefull not to tear the gasket and examine headcap and replace as necessary. If headcap looks good, pull cylinder and clean all surfaces where orings contact and remove scratches with fine sandpaper (400 grit). Lube orings with silicone paste lube available at Lowes in the plumbing department and/or swiming pool supplies area. Generally, you do not have to replace any orings unless they are broken or badly worn by grit. After you reinstall the cylinder, make sure that it moves up and down (travel is about 1/4"). Piston oring should fit snug enough to hold piston in place without dropping down the cylinder under its own weight. Parts available at www.toolpartsdirect.com Good luck and post again if you have other questions.

Posted on Jul 10, 2010

Testimonial: "Thanks, bud! Thankfully, with a little more oil and some extra tapping, I was able to reseat the cam. All is well! "

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