Question about Hitachi NV45AB2 Roofing Coil Nailer

3 Answers

How do you remove the cylinder from the nailer

I have the cover off and the piston and cylinder plate off but cannot budge the cylinder. Should you be able to remove the cylinder by hand?

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The cylinder is held in place very tightly by o-rings to keep a good air seal between the top and bottom half. Sometimes you have to apply some gentle prying pressure with a screwdriver to loosten it. Be careful as the the cylinder and body are soft metals and can be scratched or bent easily. If prying doesnt' work, turn the gun upside down and hit the egde of the top of the gun, again firmly but not hard enough to deform the head, on your workbench to make the cylinder come out.

Posted on Feb 23, 2012

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On the cylinder plate Hitachi has 2 threaded holes - the screws for the head cap conveniently fit into. Thread the bolts in a bit and use a screwdriver to twist the cylinder plate off. Once the plate is off, the cylinder should pop up, if not, hold the gun and strike the body of the tool straight down with a rubber mallet.

Posted on Oct 18, 2013

  • 2 more comments 
  • Parson's Repair Shop
    Parson's Repair Shop Jun 15, 2014

    DO NOT USE PLIERS OR A SCREWDRIVER TO PRY OUT THE CYLINDER!!!!

  • Parson's Repair Shop
    Parson's Repair Shop Jun 15, 2014

    DO NOT USE PLIERS OR A SCREWDRIVER TO PRY OUT THE CYLINDER!!!

  • Parson's Repair Shop
    Parson's Repair Shop Jun 15, 2014

    DO NOT USE PLIERS OR A SCREWDRIVER TO PRY OUT THE CYLINDER!!!!

  • Parson's Repair Shop
    Parson's Repair Shop Jun 15, 2014

    Hold the tool in one hand and gently strike the top of the tool body with a plastic hammer or rubber mallet - this will shock the cylinder up

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On an NV45AB the cylinder is actually spring loaded and should move freely up and down (just a small amount of movement) so it sounds as if it's stuck. Be very careful as these cylinders can be easily broken if you try and remove it with a set of pliers. Since the cylinder sticks out higher then the top of the frame on this model it is a bit tougher to do this but you can try turning the tool over and lightly hitting it against a piece of wood to "knock" it out of the housing. You will only be able to hit the front part of the housing since it sticks up so high. I have a heavy rubber mat in my shop that I use for this purpose but you can't do that with the NV45AB/2 because of the cylinder height issue.

Posted on Mar 06, 2012

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Posted on Jan 02, 2017

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This can be caused by any number of reasons.

If your piston driver does retract and slowly slides back to the downward position. This is a good indication that your piston o-ring is worn and needs replacing.

However the most common cause of the problem in which the driver will not retract at all, is that an o-ring has broken or has popped off of your piston cylinder. This o-ring is located in the bottom chamber of the gun.

Generally if the tool has not had the o-rings replaced in over a year, and if the tool is used quite often, it is good to have all the o-rings replaced especially when they are in contact with moving parts. Also as a rule, if you are unfamiliar with pneumatic tool repair, remove only the parts necessary to your problem. Often one problem can compound to many if you interfere with parts that are working properly.

To make a quick repair take following steps:

Disconnect the tool from air supply.

Remove the head cap from the body by removing the 4 bolts on the top. Be careful not to tear the gasket if you do not have a replacement.

With a thin tool pop the piston driver out of the top, by pushing upwards from the nose end.

If tool has dirt, excess oil, or grit inside clean it up as much as possible especially around rubber o-rings. Keep in mind that the tool needs oil to remain lubricated, don't leave tool dry around o-rings.

Use two head cap screws to gently remove the cylinder plate that is now exposed around the piston cylinder. Gently pull upwards (friction and an o-ring hold this tightly in place).

Now you can remove the piston cylinder. It may pop up because it is spring loaded, or it may be stuck downward. Carefully work it loose so it can be removed.

Examine the o-rings on the cylinder. Are any out of position? If there are any broken they must be replaced. If one popped out of position, reposition it.

The o-ring that can cause this problem is most likely the large rubber ring that covers a series of smaller holes that are positioned around middle portion of the cylinder.

Replace parts in the reverse manner of removal. Lubricate o-rings with appropriate assembly grease which is best, or pneumatic tool oil.

When the cylinder plate is reassembled, make sure that the cylinder is up. In other words, the spring that is surrounding the cylinder below the plate must be released as much as possible. This will enable flush contact between the cylinder and the parts on the head cap when the tool is assembled fully.

Replace the gasket, head cap, and the four bolts.

Hook tool up to air supply, check for air leaks, test fire tool.

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