Air blowing out the triger - Hitachi NR90AD 3 - 1/2'' Clipped Head Strip Nailer

Very often only the upper valve rings into the cylinder replace with the right quality o-rings and lubricate basic oks 1110 after clean or other basic sillicon-based grease and oil regular. also the nail transporter cilinder the same but has not oft great priority by leaking air If the tools was used for a long time without problems buy a complete o- ring kit and exhaust seal, valve all kind of rings that is in it because of the building heat by air copression and the oil acids make the rings hard. there are 4 types of nr83a
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probably need to check with the manufacturer.

the trigger assembly would need replaced. I have detailed instructions in the tip section on the removal and installation of the trigger valve. Let me know if you still need more assistance.

the fault is the triger return spring,,,,,,,get it looked at,,,,,
by a gun smith,,,faulty triger are dangerous,,and killers too?

fill it wit oil hold in triger and flick between forard and reverse should free up the vains inside

Unfortunately, trigger leaks are only fixable by replacing the trigger mechanism. Can you update this with the make and model? I should be able to direct you to a parts location. Trigger assemblies usualy run around $20 or so.

Dan

you have a triger fault its not locking the piston back best and safest bet is a gun smith,, never play with a triger if your not good with guns,

if i were you i would leave the bolt alown,,its a hell of a job getting them back in,,,as for the triger i know there a bit on the heavy side to pull at nearly 4 lbs but its a safe pull,you could drop the gun into a gum smith and get him to snip off a coil off the triger pull spring,,and stone the sear,, but be warned it will make the triger twitchy,,you realy dont wont to light a triger on a hunting rifle 4 - 6 lbs is normal

Sounds like the head valve is stuck in the head. Take black head off and see if the valve is spring loaded by pushing down and see if it comes up. This is the usual problem.

sounds like the rubber seals have dry rotted prob from not oiling it enough, but you should be able to go on the Bostitch web site and order new rubber seals for the gun