Question about Hitachi NR83A2 2" To 3 1/4" Full Head Framer with Depth of Drive

1 Answer

How do I fix the plunger ?

I need to repair the plunger rod malfunction in my framing nailer. It will drive a nail but the plunger does not retract .

Posted by on

Ad

1 Answer

  • Level 1:

    An expert who has achieved level 1.

    MVP:

    An expert that gotĀ 5 achievements.

    Governor:

    An expert whose answer gotĀ voted for 20 times.

    Hot-Shot:

    An expert who has answered 20 questions.

  • Contributor
  • 25 Answers

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.

Posted on Apr 18, 2009

Ad

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.
Goodluck!

Posted on Jan 02, 2017

Ad

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Bostitch framing nailer f21pl jammed 2 nails need to know how to clear the jam.


better to take it to a nailer repair shop, some nail jams can be very tricky, but if you are going to try to fix it. use a nail punch or other metal rod and with a hammer you might can remove the nails, DO NOT use a piece of metal that is larger than the nose.

Sep 17, 2012 | Air Tools & Compressors

1 Answer

Porter-cable plunger extended and will not reload new nail


could be a jammed nail in the nose assembly, try removing all the nails and dry firing. If still the same after making sure nothing stuck in the nose, you probably have an issue with the firing valve or piston.

Dec 31, 2011 | Porter Cable Tools & Hardware - Others

1 Answer

GT90CH fires but no nail after twenty shots.


a bit of air tool oil might help, make sure you are not getting condensation in the line, otherwise you may have to dissassemble to clean

Jul 27, 2010 | Senco GT90 Clipped Head Gas Framing Nailer

1 Answer

Piston blade won't retract


I've had a similar problem and found a nail had broken and lodged itself in the nail housing causing the driver to get stuck forward.

Apr 22, 2010 | Campbell Hausfeld 3 1/2" Rh Fram Nailer

1 Answer

I have a FC350A FRAMING NAILER, IT IS IN THE


check to make sure that there is not a nail jam , if the driver will not retract then the gun will not cycle . if no nail jam then replace the inner trigger

Feb 02, 2010 | Air Tools & Compressors

1 Answer

F28 ww framinf nailers. 4 relatively new


It sounds like you are using the wring nails. check the recommended nails and the degree of the strips. there is a large variety of degree's available if it is a Bostitch usually 28* is what your looking for. next the gauge of nails need to match and then whether or not they are paper collated or wire. that will cause problems like that all day. hope this helps

Dec 28, 2009 | Stanley Bostitch F21PL Nailer

1 Answer

N80CB - Coil Framing Nailer firing plunger stuck


There is a number of reasons that this will happen. Is the driver (plunger) physically stuck? Take a small screw driver and see if it can manually be pushed back. It may also be a broken head valve spring, or a stuck head valve (you have to remove the rear cap to get to these parts) Maybe this unit just needs an O-ring kit. Try these things and let me know

Apr 02, 2009 | Stanley Bostitch N80CB Coil Framing Nailer

Not finding what you are looking for?
Hitachi NR83A2 2" To 3 1/4" Full Head Framer with Depth of Drive Logo

395 people viewed this question

Ask a Question

Usually answered in minutes!

Top Hitachi Tools & Hardware - Others Experts

John Trevino

Level 3 Expert

1388 Answers

yoopertech

Level 2 Expert

131 Answers

Joe Garcia
Joe Garcia

Level 2 Expert

205 Answers

Are you a Hitachi Tool and Hardware - Other Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...