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

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LEAKS OUT THE CAP

I JUST REPLACED ALL THE ORINGS AND IT IS STILL LEAKING OUT THE TOP CAP

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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.

Posted on Sep 02, 2009

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Pull up the piston sleeve and reattach head assemnbly

Posted on Jul 30, 2009

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Not that familiar with this model but most have a diafram in the head if so check it very carefully for any tiny cuts or groves around the edges

Posted on Jul 14, 2009

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Posted on Jan 02, 2017

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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

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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.

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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

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