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Harpoon Blaster OPV issue.

Has anyone found a fix?

23 replies to this topic

#1 chavez guy

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Posted 24 June 2011 - 10:51 PM

After my Lego Harpoon Blaster (Basically a 4B) came in the mail, I realized the overpressure valve does not kick in. I remembered Coop mentioning that in a video, and I was wondering if anyone else has had the same issue with the Harpoon Blaster. I searched and did not find a fix. Anybody else find a fix to this issue?
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#2 TheSilentRebel

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Posted 25 June 2011 - 07:51 AM

I've had the same problem. Mine fills up with five pumps and I haven't even touched the pump. Would these still be legal at APOC?
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#3 shepard

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Posted 25 June 2011 - 12:05 PM

I've had the same problem. Mine fills up with five pumps and I haven't even touched the pump. Would these still be legal at APOC?


If it has no OPV it will be banned but I suggest replacing it with a normal 4b pump.
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#4 chavez guy

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Posted 25 June 2011 - 12:39 PM

Why the hell would Buzz Bee not put in an OPV? That seems unsafe to me. Unless I obtain another 4B, which breaks, I am not going to put in the effort and legal tender towards getting a new pump. I'll just keep it as a "screw around and show off to your friends" blaster.

Thanks for the information people.
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#5 TheSilentRebel

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Posted 25 June 2011 - 02:04 PM

There is an OPV. It just doesn't kick in.
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#6 chavez guy

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Posted 25 June 2011 - 03:01 PM

Is there a way to get it to kick in?
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#7 TheSilentRebel

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Posted 25 June 2011 - 03:58 PM

Hmm, Perhaps I'll dissect my pump and see. Even so, APOC's leadership team should address this.
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#8 Ozymandias

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Posted 25 June 2011 - 04:08 PM

You could follow Zorn's write-up and install a stock pump/OPRV.
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#9 ChaosPropel

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Posted 25 June 2011 - 04:32 PM

You could follow Zorn's write-up and install a stock pump/OPRV.

...or Broken SVT's. He's done the mod on Harpoon Blasters (you can see them in the Mods Pics thread).

Edited by ChaosPropel, 25 June 2011 - 04:33 PM.

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#10 TheSilentRebel

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Posted 25 June 2011 - 05:10 PM

Ok, I have range tested my Lego HB.
110 with 6 pumps
Same on 8 pumps, BUT, the OPV kicked in.
Now, after taking it to 8 pumps, the OPV kicks in at 4 pumps and I'm only getting 80'.

Edited by TheSilentRebel, 25 June 2011 - 05:12 PM.

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#11 chavez guy

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Posted 25 June 2011 - 08:43 PM

Ok, I have range tested my Lego HB.
110 with 6 pumps
Same on 8 pumps, BUT, the OPV kicked in.
Now, after taking it to 8 pumps, the OPV kicks in at 4 pumps and I'm only getting 80'.


Odd. I might try that with mine, but I am not interested in shaving 30 feet off the range. Thanks for the information though, TheSilentRebel.

Does anybody else have any suggestions as to how to fix (as opposed to replacing) the stock OPV?
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#12 TheSilentRebel

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Posted 25 June 2011 - 09:01 PM

Odd. I might try that with mine, but I am not interested in shaving 30 feet off the range. Thanks for the information though, TheSilentRebel.

Does anybody else have any suggestions as to how to fix (as opposed to replacing) the stock OPV?

No problem, I have now plugged the OPV, but I can't take it past 5 pumps. It gets roughly the same ranges at before. I might look into buying an old style pump for war use. Maybe you could do the same...
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#13 Curly

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Posted 25 June 2011 - 09:35 PM

While I have no experience with OPVs my guess is that it's stuck. You could try making it kick in with a pencil or something, and adding some lubricant somehow. Perhaps the OPV was changed slightly, an autopsy is the only way to be sure. Homemade OPVs are always an option, provided local war hosts trust your better judgement.
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#14 chavez guy

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Posted 26 June 2011 - 12:02 AM

While I have no experience with OPVs my guess is that it's stuck. You could try making it kick in with a pencil or something, and adding some lubricant somehow. Perhaps the OPV was changed slightly, an autopsy is the only way to be sure. Homemade OPVs are always an option, provided local war hosts trust your better judgement.


Haha, not only do I have close to zero knowledge on the inner workings of overpressure valves (an enlightenment from someone more experienced would be nice), I have even less knowledge on building one. Thanks for the suggestion though.

Being a newish member (through FNG method) I have not familiarized myself with how trades work (despite my year of lurking). When I get that down I'll look into buying a replacement pump. Until then I think having a screw around gun is a nice option, haha.
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#15 CaptainYogurt

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Posted 26 June 2011 - 02:00 AM

I have one of the Harpoon Blasters, and the OPRV on mine has always cracked on the 4th pump. The handle broke off, so I peered down the pump shaft and saw, to my dismay, that mine does not have a screw.

I have a feeling that this is why they don't get as good of ranges as 'normal' BBBBs. Without any screw in the OPRV, the spring is not as compressed, so there is less pressure required to activate the valve.

Tomorrow, I'll chop down my pump shaft and see if I can install a screw.


Also, JSB, thanks for linking that post. I'd have no idea what I was looking at without it.
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#16 chavez guy

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Posted 26 June 2011 - 12:28 PM

Wow. That was a pretty informative article. Thanks Bob. I had always thought they worked something like that, and I guess I was right.
But now I am convinced that I do not want to go through the hassle of destroying my pump just to get to the OP valve.

When I get something worth trading I'll snag myself an original 4B pump shaft.
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#17 Curly

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Posted 26 June 2011 - 12:56 PM

Haha, not only do I have close to zero knowledge on the inner workings of overpressure valves (an enlightenment from someone more experienced would be nice), I have even less knowledge on building one. Thanks for the suggestion though.


OPVs fairly simple. They are usually inside the pump, but don't have to be. An OPV has a spring that pushes a sealer. This stops air from always escaping, but when the system reaches a certain PSI the spring compresses from the pressure. This opens the OPV, releasing air until the system is under low enough pressure for the spring to seal. JSBs exploded diagram pretty much covers it. This page by Venom covers a simple OPV that can be added with simple tubing connectors.
Best of luck.
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#18 chavez guy

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Posted 30 June 2011 - 11:16 AM

Last night I had sort of an epiphany for this issue.
Internally, the airgun part of a berserker is identical to a 4B's internals right? So I was just thinking take the pump shaft from the berserker, throw that where the 'poon blaster's pump shaft would go, and then place the Harpoon Blaster's pump shaft in the berserker, and give it (berserker) a shotgun attachment so it would be more war legalish.

What do you all think?

Edited by chavez_guy, 30 June 2011 - 12:26 PM.

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#19 chavez guy

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Posted 30 June 2011 - 06:10 PM

Sorry to double post, but even though I posted this morning, it didn't bring the topic to the top and it still said the last reply was from Curly. I know bumps are extremely erotic, but since something glitched out and it gave me an "internal service error" when I posted I thought an exception could be made. Please tell me if I am wrong.
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#20 Muttonchops

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Posted 20 July 2011 - 04:03 PM

Being that I have four Harpoon blasters, this happened to two of mine. Curly was right the first time, the OPV is stuck. Just pump it up way higher then you normally would, it will likely engage after the ~10th pump, and after that it should work normally. No pulling apart the blaster, no installing new parts. Simply pump the blaster up and the OPV should engage. Be careful, be gentle (dont pump it like an asshat) and you'll be fine.
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#21 chavez guy

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Posted 20 July 2011 - 04:35 PM

Being that I have four Harpoon blasters, this happened to two of mine. Curly was right the first time, the OPV is stuck. Just pump it up way higher then you normally would, it will likely engage after the ~10th pump, and after that it should work normally. No pulling apart the blaster, no installing new parts. Simply pump the blaster up and the OPV should engage. Be careful, be gentle (dont pump it like an asshat) and you'll be fine.

I'll try it, but is any of my tubing in danger of going kablooey or anything?
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#22 Curly

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Posted 20 July 2011 - 04:37 PM

I'll try it, but is any of my tubing in danger of going kablooey or anything?

Pump very slowly, about 3 seconds per pump. If you're at 10 pumps, fire. There is a very different feel when the OPV kicks in, you'll know when it happens.
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#23 Curly

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Posted 20 July 2011 - 04:37 PM

I'll try it, but is any of my tubing in danger of going kablooey or anything?

Pump very slowly, about 3 seconds per pump. If you're at 10 pumps, fire. There is a very different feel when the OPV kicks in, you'll know when it happens.
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#24 chavez guy

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Posted 20 July 2011 - 04:44 PM

Pump very slowly. There is a very different feel, you'll know when it happens.


That is what she said.

Sorry, sorry, but in all seriousness, thanks for the info. I'll go try that right now. I'll let you know if it works or not in a minute or two.

*2 minutes later* Wow. That worked perfectly. It kicked in at EXACTLY 10 pumps, and now I have a working overpressure valve.

Thank you so much people!

Edited by chavez_guy, 20 July 2011 - 04:47 PM.

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