Question about Hitachi NV45AB2 Roofing Coil Nailer
The first thing I would ask you to check is: make sure it is the trigger that is leaking and not the safety valve which is right in front of the trigger (this is more common). If the safety valve is leaking the problem is most likely in the head of the gun (bad gasket / o-ring at the head). If it actually is the trigger, you should replace the O-rings, urethane ball, and seat in the trigger.
Posted on May 29, 2014
Good afternoon Hans,
There could be a couple of reasons for the leak. If the tool hasn't been serviced for quite some time there's a risk that one or more of the O-Rings in the trigger valve has perished. (When you're checking this, please be careful as there is a plastic ball inside that is easily lost....) if, this is not the case, let me know
Posted on May 19, 2014
Testimonial: "Hi, it seems like i found the problem. The trigger lifts a plastic pin that is fitted inside a small threaded metaltube. On the top of the tube is a seat for the plastic ball. The top of this tube must have a rubber sealing that seals when it is screwed into place? I think it is this sealing i miss. When the pin lifts the ball, the air streams pass the ball and out on the sides of the tube, and into some passage that operates the piston. If this sealing is missing, the air goes out at the trigger. When dismantled it came out som goo that can be a sealing of the wrong material that has turned into some snut-like consistense. The problem i have now is to determine which model i have so that i can order the spare sealing. Anything you know?"
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Posted on Jan 02, 2017
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