Pin Nailer- Help

[scratchedup]

Hitachi NP 35A 23ga PIN NAILER
This has been sitting on the shelf for several years. Bought new but never used (might be related to the problem).
I have started to use it and it worked great for a week or so. Today it just stop driving the pins.

Seems like very low pressure. I will not drive at all. I can pull the trigger and it fires but it is very weak, no kick and low noise exhaust. I taken the tip and slide apart...clean and lubricated...new pin...no help.

 

[wayne55]

Does not help you, but I had a Porter cable nailer in which a round plastic part that fit in the cylinder had just dis-integrated. The nailer at one time had worked fine and then after sitting for a long period would not work. I was able to replace the part.

 

[Mr Ratchet]

Might need a rebuild or some parts replaced as wayne55 said. I've had good luck by spraying some WD-40 in the air hole and then cycling the gun. The followed up by a couple of drops of air oil. I've done this on oil less guns as well.

 

[cgrutt]

Something must be in the air I actually had three different nail guns do the same thing this week believe they need rebuild kits (new rings, etc). Mine were same mostly sit unused for long periods.

 

[JohnX14]

This won't help, but I had the same hitachi pin nailer fail the same way.

 

[scratchedup]

To bad we can just trash stuff and buy new for cheaper then repair....

 

[Buckaroo5]

Like Mr. Ratchet suggested, I would try adding a few drops of oil into the quick connect fitting. Maybe the seals are dryed out.

 

[RTM]

The dried out seals is often the problem. I think I used a grease on one of mine Parts disintegrating has happened on older guns for me.
They are relatively easy to rebuild, if you can get the parts. Lots of internet videos on how.

 

[finn]

I have a Bostitch
sheathing stapler that failed the trigger valve cartridge..

$10 or $25. for a replacement cartridge from Amazon. Mine was the $25 valve.

Fixed it.

There’s a thread here from 2022 on this. Do a search.

edit: looks like the Hitachi trigger valves run from $7-$22, plus shipping from a half dozen vendors.

 

[The Cobbler]

check that the firing pin is retracted all the way. check the air inlet screen for blockage . douse the air inlet with wd40 or similar and fire repeatedly

 

[AEAdam]

Some nailers are sensitive the brand of nails they fire. Rule out the easy stuff first. Pin nails are small. You may have a jamb that wasn’t initially obvious. I’m not buying the story “it worked and then stopped due to seals”

Assuming I’m dead wrong and you can’t fix this, pin nailers are by definition, occasional use items. For me, I never wanted to pump up my big noisy compressor for 4 brad nails.

Battery pin nailers are pretty great. Never thought I’d hear myself say this, but when you can live with it, an 18 ga stapler is amazing. Headless fasteners just don’t have amazing pull up. If you are gluing stuff and just want a tiny dart to stop them from sliding, 20 ga battery guns run all day. So convenient for just a couple fasteners. I currently have Milwaukee nailers.

The only air nailers I still use are my trusty framing nailer Hitachi Metabo NR90, and the siding/coil nailer NV65

 

[Codyboy]

Some nailers are sensitive the brand of nails they fire. Rule out the easy stuff first. Pin nails are small. You may have a jamb that wasn’t initially obvious. I’m not buying the story “it worked and then stopped due to seals”

Assuming I’m dead wrong and you can’t fix this, pin nailers are by definition, occasional use items. For me, I never wanted to pump up my big noisy compressor for 4 brad nails.

Battery pin nailers are pretty great. Never thought I’d hear myself say this, but when you can live with it, an 18 ga stapler is amazing. Headless fasteners just don’t have amazing pull up. If you are gluing stuff and just want a tiny dart to stop them from sliding, 20 ga battery guns run all day. So convenient for just a couple fasteners. I currently have Milwaukee nailers.

The only air nailers I still use are my trusty framing nailer Hitachi Metabo NR90, and the siding/coil nailer NV65

Rubber and plastic deteriorates, add in some high pressure and ****. Kind of like letting the smoke out of a motor. It works and then **** it don't work anymore.
I had the same thing happen as wayne55, PC finish and brad nailers that had the plastic inside turn to a crumbly mess while in use. Yes they sat unused for long periods of time.
It's been a while since I pulled it apart , but my Bostich framing nailer quit too. I was using it to frame a wall and it just started blowing air out the exhaust port. I banged it around thinking maybe it was just stuck. Nope piston was gone.

 

[rlitman]

Rubber and plastic deteriorates, add in some high pressure and ****. Kind of like letting the smoke out of a motor. It works and then **** it don't work anymore...

That's my usual nailer problem that requires taking things apart. The most common issue though is oil that's turned sticky by sitting on the shelf for too long, and liberal oil and use fixes that.

As for rubber deteriorating, yeah, I've had plastic pistons crumble, but when that happens the tool hisses when you connect the hose and shoot it. I've had o-rings crack and pull out of their grooves and block the channel in the trigger, leaving a nailer silent like this. Either one is a relatively easy fix.

 

[niget2002]

My wife distracted me when I first read the title. I thought it said Pinot Noir help. I was sadly disappointed.

 

[finn]

Rubber and plastic deteriorates, add in some high pressure and ****. Kind of like letting the smoke out of a motor. It works and then **** it don't work anymore.
I had the same thing happen as wayne55, PC finish and brad nailers that had the plastic inside turn to a crumbly mess while in use. Yes they sat unused for long periods of time.
It's been a while since I pulled it apart , but my Bostich framing nailer quit too. I was using it to frame a wall and it just started blowing air out the exhaust port. I banged it around thinking maybe it was just stuck. Nope piston was gone.

That’s what happened to my Bostitch sheathing stapler. The “whoosh“ of the escaping air made it pretty obvious what the issue was.

I’ve had other nailers (PC and Paslode) that have occasionally jammed over the years where it wasn’t at first look obvious what was going on. They requires some simple partial disassembly to find the issue.
Overall, the pneumatic nailers and staplers have been pretty reliable. Some are thirty five plus years old.

 

[Codyboy]

My wife distracted me when I first read the title. I thought it said Pinot Noir help. I was sadly disappointed.

I should have sought help with that once.
I bought a "black box " 5 liter or whatever it was and thinking it was red.
Nope it was white.
Blah.
Wasn't aware it came either way. I tried but white wine is disgusting to me.
I threw it out.

 

[Dakotadadv8]

Porter cable brad nailer quit after 20 years. Picked up a Metabo at Lowes.