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Help In Fixing a Nail Gun Trigger

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Forum topic by Lovegasoline posted 05-31-2018 11:55 PM 383 views 0 times favorited 4 replies Add to Favorites Watch
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Lovegasoline

66 posts in 457 days


05-31-2018 11:55 PM

I have an older Porter Cable trim nailer model FN250A.
I’m in the middle of trim my kitchen cabinets and I’m replacing a face frame … and I went too shoot in some nails and the trigger was gone. Gulp.
The roll pin that hold it in place had fallen out (I’m not sure if it’s pressed in or has a clip to hold the pin). I haven’t had time to dig deeper, I did look at the manual and it’s a two part trigger: primary trigger and smaller secondary trigger.

So the trigger valve stem is facing down now … but no trigger to depress it. I just need to shoot about 8 nails. I need to look more carefully at the assembly but I was so pressed for time, I tried positioning the trigger and for some reason the gun wouldn’t shoot. Pressing the trigger valve directly did nothing either.
Am I missing something basic here in how this is engineered to fire, or do I just need to set aside the time and go through this with a finer tooth comb?


4 replies so far

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Loren

10477 posts in 4067 days


#1 posted 06-01-2018 12:27 AM

One of mine lost the pin and I replaced it with
a pop rivet shank I think. Maybe it was a
machine screw.

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Lovegasoline

66 posts in 457 days


#2 posted 06-01-2018 12:33 AM

Hmm. The issue is that for some reason the trigger valve, when directly depressed (no trigger attached just pressing the valve/pin) did nothing, no actuation of the pneumatic system. I need to take the time for a closer inspection (but have no time! thus the post). The trigger assembly looks simple and direct in design so the fact I couldn’t just press the trigger actuation valve in directly and get a nail shot wasn’t intuitive … so I was wondering if there’s some sort of safety/mechanism/leverage/sympathetic magic/secret aspect I was overlooking.

Re: pin:
When I looked at the manual I didn’t see a clip for the pin so it may just be pressed in place (though the pin does have a groove cut in it’s circumference encouraging me to look in the rubble on my floor for a teeny ‘c’ springclip that may or may not have ever existed) ... the parts list refers to it as a ‘rolled pin’. I suppose a nail inserted and bent would also serve.

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Lovegasoline

66 posts in 457 days


#3 posted 06-01-2018 01:35 AM

Just back from Home Depot to grab sander belts and had a look at the PC nail guns, looks like a little stiff rubber o-ring hold the rolled pin on. Also the triggers have a little spring, look like the vanished as well.

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Lovegasoline

66 posts in 457 days


#4 posted 06-08-2018 12:13 AM

And duh … I had time to actually have a closer look at things (was super rushed previously with other deadlines). Due to the double trigger design, the safety wasn’t being disengaged thus resulting in no actuation when the plunger pin was pushed. All works well now.

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