SENCO 23g headless air pinner repair

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Forum topic by bluekingfisher posted 10-27-2013 09:05 PM 1794 views 0 times favorited 11 replies Add to Favorites Watch
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1333 posts in 4265 days

10-27-2013 09:05 PM

A few days ago I posted a question regards a restriction on the adjustment mechanism of my 23g headless pin gun. Despite having lots of offers of support and good luck, no one it seemed had had such a problem or at least been able to offer specific advice on how to go about solving the problem.

With this in mind I thought why not strip it down and have a look, hopefully the cause will be obvious and a quick repair can be made. I was hoping a pin or part of one would fall out and the job would be done.

All in all it was a fairly straight forward job, the main issue was the size of the gun and the working parts which are of course very small and fiddley

You can see the slide with the back and forth arrows, movement either way either raises or lowers the internal spring (more on that later). Taking the gun apart was straightforward, well almost. It was just a case of removing cotter pins which were secured by small rubber o rings or small machine bolts with nuts or tapped into the body of the gun.

The magazine housing removed from the main body of the gun.

This was the only problem I encountered, when I removed the pin adjustment slide from the magazine housing there is, and at this time unknown to me, a tiny spring and ball bearing which facilitate the smooth travel of the adjuster over the body. When I removed it by sliding it off the mag body the spring hit me on the nose and the ball bearing hit the ceiling of the shop like a bullet then rebounded onto the bench then rattled off somewhere behind my bench into a pile of dust and timber. I immediately thought that is the end of that ball bearing and a new part would need to be ordered. Fortunately, after getting down on my hands and knees behind the bench I found it, unbelievable as it was tiny

The guide which allows for the different sized pins is a piece of stamped spring steel with a couple of diagonal slots milled into it. These slots line up with the cotter pins which hold the adjuster slide onto the body so when the guide is slid back and forth the cotter pins ride in the diagonal slots which raises or lowers the track which accept the pins.

The problem is, iti is stamped from a sheet of spring steel about 1mm thick. Being stamped, the edges were rough in places and had burrs and sharp corners. The slots themselves were a little rough. In addition, the pin track is so minuscule that there is no room for slop or play. The burrs and sharp edges prevented the guide from sliding up and down smoothly. So, the solution was to get out the needle files and smooth off all the rough edges and level the high spots.

A little trial and error ensured the guide would slide quite easily within the track and body of the magazine.

Once I was happy it was a case or re assembling the gun and hope the adjuster would travel the full length of the range to fire the one inch pins.

With the one inch pins loaded would the magazine close and allow the gun to fire?

Yep, the magazine slide closed over the pins OK but would it fire. I connected it to the air line and crossed my fingers, then fired. RESULT… worked.

The one inch pins protruding from the 10mm stick of mahogany, and a nice little hair brush it made!

I tried all the other pins in the range and they all fire too so an hour and a halfs work made the repair. As always, once the job has been done once subsequent repairs if required could be done in a fraction of the time.

I hope this small job will come in useful for others who may encounter similar problems with their headless pinner.

As always, a big thanks to SWMBO for her photographic.

Thanks for taking the time to read.


-- No one plans to fail, they just, just fail to plan

11 replies so far

View HillbillyShooter's profile


5811 posts in 3578 days

#1 posted 10-27-2013 09:25 PM

Congratulations on figuring out the problem, writing it up for others and getting great photographic assistance from Julie, aka SWMBO. Seems like everything needs to be tuned up these day. This will be a very nice reference source for others; and, you know that if you had this problem, others will likewise.

-- John C. -- "Firearms are second only to the Constitution in importance; they are the peoples' liberty's teeth." George Washington

View TopamaxSurvivor's profile


22830 posts in 4962 days

#2 posted 10-27-2013 11:07 PM

I hate it when parts go flying! congrats on the recovery and the fix.

-- Bob in WW ~ "some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence

View Belg1960's profile


1153 posts in 4351 days

#3 posted 10-28-2013 12:04 AM

David, I’m always so hesitant to pull things apart for the reason you stated with the spring and BB. If something comes apart that I wasn’t expecting and I didn’t see how it came apart I’m screwed!! Glad you got it worked out. Pat

-- ***Pat*** Rookie woodworker looking for an education!!!

View gfadvm's profile


14940 posts in 3976 days

#4 posted 10-28-2013 01:16 AM

Very impressive. I am always hesitant to tear into something like you did. Wish you were closer and I’d have you dismantling my non-functional tractor!

-- " I'll try to be nicer, if you'll try to be smarter" gfadvm

View 404 - Not Found's profile

404 - Not Found

2544 posts in 4255 days

#5 posted 10-28-2013 01:49 AM

It’s good that you’re up and running again, but I’m surprised you had this issue with the Senco. From what I’ve heard they are supposed to be the AK47 of the nail gun world.

View bluekingfisher's profile


1333 posts in 4265 days

#6 posted 10-28-2013 08:33 AM

John, Bob, Pat, Andy, Renners – Thanks for taking the time to read and respond fellas, I was of the way of thinking having a max of 22mm wasn’t going to much good so if it went wrong it was a valid reason for sending off for the larger Bostitch with it 1 3/16” capacity. As it turned out it was quite straight forward laying the parts out in order during the assembly helped when I reassembled but it did go wrong a couple of times. Like when you put the wrong length machine screw in the wrong port, no big deal.

Finding the ball bearing was a touch of luck Pat, I was hoping to see it shining somewhere on the floor but being oiled it picked up all the dust and had camouflaged itself perfectly.

Renners, I too was of the opinion Senco was a hardy tool but if you look again at the second photo, you will see on the bottom left hand corner of the magazine where it was made. Need I say more lol.

John, I hope someone’s else finds my experience useful. I fitted an arbour to an older table saw, one which would accept a dado. A chap from Australia contacted me asking how I had done it, I think he managed to complete the job on his own but glad I could have been of assistance. I don’t know what happened with the last photograph, I blame the photographer lol.

Andy, never worked on a tractor but I reckon it may be easier, those small diddly parts on the pin gun tried my patience at times.

Bob, maybe the manual should have an additional warning….................flying parts included!

-- No one plans to fail, they just, just fail to plan

View bluekingfisher's profile


1333 posts in 4265 days

#7 posted 10-28-2013 08:41 AM

I meant to include this image earlier, it shows the little indented scale guide on the body of the magazine identifying pin length. As the adjuster (shown with the < > arrows ) is pushed back and forth the internal stamped piece with the milled slots travels up or down dependant on the pins required.

Thought I would include this photo as my initial description didn’t make sense having read it a second time after posting.


-- No one plans to fail, they just, just fail to plan

View NoLongerHere's profile


893 posts in 3962 days

#8 posted 10-28-2013 12:05 PM

hey David,
I have a problem with my pinner not firing 1” nails – was that your problem?
Good to know I can fix it. Just have to watch for flying parts!

BTW – Any project can be edited at any time. You can flip that last picture in windows gallery or whatever you use and then Edit this post, erase and replace it with new picture…..if you want.

View bluekingfisher's profile


1333 posts in 4265 days

#9 posted 10-28-2013 04:19 PM

Hi Mark, yep had a problem with the one inch nail. The adjuster track (the part with the diagonal slots) wouldn’t move far up enough inside the body of the magazine, although I didn’t know that at the time. I thought it must have been a broken or trapped pin fouling the mechanism. Fires great now but if there are springs involved be careful they don’t fly off, never to be seen again.

I tried to rectify that last image but it is somehow corrupted, possibly because it was taken on the reverse camera of the ipad. I’m no good with photography or it so I guess the image will have to stay as it is lol

Good luck with your own pinner, give it a go then let us know how it went.


-- No one plans to fail, they just, just fail to plan

View Roger's profile


21055 posts in 4090 days

#10 posted 10-30-2013 09:13 PM

John said it right. Good repair David.

-- Roger from KY. Work/Play/Travel Safe. Keep your dust collector fed. [email protected]

View bluekingfisher's profile


1333 posts in 4265 days

#11 posted 10-31-2013 09:41 AM

Thanks Roger – I was pleased with how it turned out.

-- No one plans to fail, they just, just fail to plan

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