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Vulcan Manual Works, Auto Doesn't

After teardown, belt advances, darts don't come out

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#1 BcNexus

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Posted 15 March 2009 - 10:10 PM

Long time lurker, first time poster. Splitlips beginner mod and advanced mods on his Vulcans have helped me a lot.

I share a Vulcan with my nephew, and recently, it jammed with the tube stuck in the out position. No cocking, no pushing on the tube, would get it unjammed. The belt feeder wheel would not spin, the belt would not advance, the blaster would not fire manually. So began my long journey.

It's day two and I'm hungry and tired, so hopefully this post isn't too crappy.

First, the cool stuff. I minimized it by removing the faux barrel (love that description, splitlip).

I reamed the air restrictor AND part of the two piece plunger barrel with hand files. (Later I borrowed my parent's dremel :-)

Here's the best part! I split one side of the gun into three pieces for easy access repair and maintenance.
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The most important piece is the middle because that one covers the firing mechanisms.
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Now, I have a nice start. HOWEVER! Now, the blaster will not fire full auto. The belt advances, the tube extends and retracts it all seems OK except that the darts aren't flying out.

Sometimes they come out when I goose the trigger, get the tube to sick out then hold the trigger down. Even then, that's rare, and only the one dart comes out.

Manual cocking and firing works great. It seems like a timing issue. I've tried messing with the gears, but don't understand if I can adjust the timing at all.

Is there a fix? Searching hasn't revealed any posts about this.

Oh, and I have a small white tube and metal rod, about 1 inch long that for the life of me, I can't remember where it goes in the blaster. Is it important? I have like four dozen pics I took during the teardown, and it's not in any of them :-(
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#2 durka durka

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Posted 16 March 2009 - 05:55 AM

I have this same problem with my vulcan. I can not figure out wich piece is off and causing this problem.

Now my vulcan (in pieces) sits in a cardboard box.

The small white tube and metal rod do go in the gun. There is a hole to the top right of the gears. The metal rod goes in it. Then you put the plastic tube over the metal rod. The cover of the gears should then fit over this nicely, as long as the metal rod is in place correctly.
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"The warrior who cultivates his mind polishes his arms"

#3 Split

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Posted 16 March 2009 - 10:12 AM

Oh, and I have a small white tube and metal rod, about 1 inch long that for the life of me, I can't remember where it goes in the blaster. Is it important? I have like four dozen pics I took during the teardown, and it's not in any of them :-(

That guides the plunger back in full auto mode. Without it, the plunger ends up not moving any air. The single shots still works because the priming handle guides the plunger back when you use it.

Anyway, I've been looking for a cheap, broken, stock vulcan so I can finish my FAQ. Anyone have one? Durka?

Edit: Response to Bob - they don't go for less than $25 at the Goodwills here, and aren't eligible for the discounts.

Edited by Splitlip, 16 March 2009 - 02:01 PM.

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Teehee.

#4 BcNexus

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Posted 16 March 2009 - 11:50 AM

That guides the plunger back in full auto mode. Without it, the plunger ends up not moving any air. The single shots still works because the priming handle guides the plunger back when you use it.


So it belongs where Durka says it belongs, a hole to the top right of the gears? That should fix the auto fire? Can't wait to see! Yup, it's a roller for the plunger stick. Of course you all knew that, but just for posterity...

Edited by BcNexus, 16 March 2009 - 07:47 PM.

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