20 Most Recent Hitachi Wh18dl 18v Liion Cordless Impact Driver - Page 3 Questions & Answers

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Bad trigger switch(circuit board)

Sounds like a bent nose. It's been dropped

could be in need of an internal adjustment to stop the hammer from hitting the end plate ( travelling to far) talk with a tool repair shop and see if there is something that can be done contact a a hitachi service agent for advice go google and type in--- repair manual for Hitachi nail gun-- and see if there is a manual in pdf version that you can download

If it's new, return it. on warrant. If used, ask where you bought it, maybe they have some experience

oil it

lube the nails

If you are going to replace the cylinder ring I would recommend getting the service kit (Part #18000) and replacing all the o-rings. I'm assuming you have already taken it apart this far but if not: Remove the 4 hex bolts on the cap and remove the head. Using 2 of the bolts - thread them into the inserts on the top cylinder ring and use them to twist it off. The cylinder and piston should 'pop' up under spring pressure from below. Using an o-ring pick, remove the o-rings and thoroughly clean the tool - replace the o-rings and the bad cylinder ring. Lubricate the new rings with the grease provided and reassemble. Hitachi NR83A 3 1 4 34 Full Head Nailer Parts

Pound roll pin out of black trigger and remove. Turn silver slotted part with screw driver and the two valves will pop out. Usually it's the flat trigger bushing that is bad and makes it leak. I have all parts. airnailerparts.com

You need to depress the safety; press the end of the gun up against the wood.

How old is the nailer. If it is old enough and not oiled each use, O rings get damaged and will leak air at piston and trigger valve. Depending on the brand a rebuild kit may be available with new O rings and trigger valve.