I have a hitachi nv45ab that was in desperate need of new o rings. I bought the kit and a service manual and followed step by step replacing every o ring in the gun. Now when I plug in the air line the gun just blows air out of the exhaust port. Its not a small leak it just blows all the air right through the exhaust. I have taken the gun back apart 3 times now and still come up with the same result. I do have one o ring left over from the kit its numbered 9 in the service manual valve o ring. It is supposed t sit on the head cap but there was no o ring there when I took it apart. I have tried to put the o ring in but do not see where it would go. And every place I have tried does not make a difference. I have another working gun but I am affraid to take it apart to look if it has the o ring in it. I dont want to have two guns that dont work. Please help.
-Alan
This probably is the problem,
The cylinder that the piston moves up and down inside is probably to low, and not making contact with the rubber piece in the head cap.
The cylinder has a spring that allows for movement up and down, take a pliers and gently pull up the cylinder if it does not move freely on its own. It will stop when it reaches the cylinder plate ( the part with 2 screw holes for easy removal). Be careful not to mar the cylinder though.
When reassembling the cylinder should make contact with the head cap. Hope that works!
SOURCE: Hitachi NV45AB coil nail gun is leaking air from
the top!! o-ring inside of thr top plate is bad you need to remove the plate /dissasemble and replace the o-ring
6,809 views
Usually answered in minutes!
Thank you so much for the quick response. The gun works like its brand new again. I cant believe it was that simple.
-Alan
This was my problem as well. Runs like a champ now!! Thanks so much!!
×