20 Most Recent Hitachi 3 - 1/2" Full Roundhead Framing Nailer Questions & Answers

I have a older Hitachi 3 1/2 full roundhead nailer and on my there is a button on the front below the head at the end of the nails that you push sideways and hold and slide the nail gun tip up or down. There should be grooves across the front of the tip.

Hitachi 3 - 1/2"... | Answered on Nov 17, 2015

Hitachi sells an adjustable foot attachment that makes it easy to adjust for using your framing gun to install siding or other use where you want more control of how deep the nail sets. Do not remove the safety. Contact hitachi dealer for the accessory. Good luck

Hitachi 3 - 1/2"... | Answered on Jul 14, 2013

To find the model number, look on ebay for hitachi framers and hopefully you will find one listed that looks like yours. If no joy, take the gun to your local fastener/nailgun dealer for parts. The dealer most likely has box full of used parts for your gun. I have seen many older nailers with bent safety foot that caused the plunger to stick in the engaged position. Some nailers have the safety return spring incorporated within the trigger plunger /valve area and still others that have the spring hidden under a guard on one side of the nailer (guard part # 883493). Look under the main body of the nailer for an indention where one side of the safety spring fits into (less than 1/2 inch in diameter) ; directly below the indention will be a point on the safety foot to catch the other side of the spring. Good luck

Hitachi 3 - 1/2"... | Answered on Nov 02, 2012

Not sure which model you have but there are usually screws on each side of the magazine where it is held on to the nose. Remove those screws and the one that holds the bracket at the rear of the gun body. Once you remove the magazine you should be able to see how the spring is held into place. If you have the model number you can find a tool diagram for it here;


Hitachi 3 - 1/2"... | Answered on Jul 18, 2011

go to hitachipowertools.com and type in the model number nr83a2 and then click on the pic it will direct you to a tech page and scroll about 1/2 way down to the instruction manual link. The manual is 52 pages long if you download it complete. If you need more assistance let me know and if I have helped you with your request would you please vote accordingly. Thank you

Hitachi 3 - 1/2"... | Answered on Mar 24, 2011

You may need a rebuild kit of the O rings, and, for certain added lubrication. The return stroke of the nailers require that all the parts move easily and dried out or "dead" O rings are a common problem causing failure to return properly.

Hitachi 3 - 1/2"... | Answered on Jan 25, 2011

Hello jsc.... the depth that the nailer drives the nail is dependent upon two factors, the hardness of the material you are driving the nail into and the air pressure. Generally when you want the nail to go in more you adjust the air pressure to a higher setting, going 5 psi at a time until you are close to perfect and then fine tuning the air pressure.

Sometimes people find that the air compressor itself is inadequate for the job. in that case, the only choice is to move up to a higher psi compressor. Joe

Thanks for choosing Fixya!

Hitachi 3 - 1/2"... | Answered on Jan 25, 2011

You have broken or out of place o-rings in the gun. Unfortunately Hitachi doesn't make rebuild kits for their guns, you have to order each o-ring and seal you need to rebuild one. www.ereplacementparts.com is a good place to find a breakdown of your gun, you can also buy parts there or get the part numbers you need and shop the internet for prices. If you decide to do this make sure to liberally grease up the o-rings while reassembling the gun and get each o-ring back in its proper place.

Hitachi 3 - 1/2"... | Answered on Dec 24, 2010

Most all nail guns can be converted to single fire, however, usually parts must be changed. Some brands have two positions on the trigger, others have a button position near the trigger to accomplish same. Check with dealer or email your gun model # and I will explain your to fix. For now you can replace the spring on the safety with one slightly stiffer. Also try nailing with trigger depressed and quickly bump the gun to fire, this method usually works better than placing the gun in position then firing. Good luck with your repair.

Hitachi 3 - 1/2"... | Answered on Jun 30, 2010

go to Hitachipowertools.com and they have a service center locator on their site. If you still have trouble let me know I work on them everyday.

Hitachi 3 - 1/2"... | Answered on Jun 30, 2010

This sounds like the nailer is not in the "home" position. Usually this is due to a leak in the o-ring or a lack of lubrication that is not allowing the plunger to return to the home position. If you can get an O-ring kit, I'd replace all of the orings and make sure that everything is properly lubricated. Should that not fix the problem, the next likely candidate would be the trigger assembly itself. The O-ring kit will run about $20 or so and a similar amount for the trigger assembly.

Hope this helps,


Hitachi 3 - 1/2"... | Answered on Jun 04, 2010

is it leaking out the trigger or the top?

Hitachi 3 - 1/2"... | Answered on Jan 17, 2010

I need a little more information, try putting marvels mstery oil in the line hose and try getting the piston to free up.

Hitachi 3 - 1/2"... | Answered on Sep 13, 2009

Draw it on paper, draw a vertical line then add a 20 degree line and add the length of the nail on the 20 degree line and you should be able to determine ths solution from that

Hitachi 3 - 1/2"... | Answered on Aug 22, 2009

I've had that happen before and what I found was one of the Staples or nails had misfired and wedged before leaving the gun. read the manual on how to get to it for that particular model and also it might be a good idea to adjust your pressure accordingly to keep it from happening again. If the force isn't set proper then a nail could Jam , block the mouth and not allow any other nails to exit. It's very easy to do and not that hard to fix once you've done it at least once. Good luck.

Hitachi Tools &... | Answered on Feb 11, 2019

The number one issue is bad fuel - even if you just purchased it, turn the cell over and check the date stamped on the bottom (often stores don't rotate their stock)
If the fan starts when the nose is depressed but there is no spark then I would investigate the spark wire (make sure there are no nicks or cuts that may short to ground) and the ESU (Electronic Spark Unit).

Hitachi Tools &... | Answered on Feb 02, 2019

Have you kept it properly oiled? It might be jammed because it's too dry.

Hitachi Tools &... | Answered on Oct 24, 2018

Sounds like it's overly dry; needs oiling. Or there is something clogging the air lines or the air chamber inside the gun.

Hitachi Tools &... | Answered on Oct 24, 2018

It sounds like you're producing difficulties yourself by attempting to solve this problem rather than seeking at why their can be a difficulty inside very first place https://www.fliptite.com/

Hitachi Tools &... | Answered on Oct 05, 2018

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