Huben Any issues or problems with Huben gk1 please share your experience

[Massiemax]

I have a slow leak from my 25 V3 gk1. It will leak from about 32mpa to about 24mpa in approximately 2weeks. I haven’t replaced any seals yet, but I have practice taking the gun partially apart. I just can’t seem to find where the leak is coming from because I don’t hear anything. Can anyone help?

 

[BABz58]

I have a slow leak from my 25 V3 gk1. It will leak from about 32mpa to about 24mpa in approximately 2weeks. I haven’t replaced any seals yet, but I have practice taking the gun partially apart. I just can’t seem to find where the leak is coming from because I don’t hear anything. Can anyone help?

Shot of spray silicone lube in the fill port the next time you refill it. Problem solved.

 

[Massiemax]

Shot of spray silicone lube in the fill port the next time you refill it. Problem solved.

Thanks-I was a bit impulsive posting because I was frustrated, but didn’t realize there’s a whole section in this thread, addressing the issue

 

[Massiemax]

Found the leak

 

[MrP]

Found the leakView attachment 478824

Curious to find out what the issue is here.

 

[Massiemax]

Curious to find out what the issue is here.

I ended up taking the valve out and inspected the O-ring, which looked to be fine. Inspected the plastic valve. There were no cracks or blemishes iso I cleaned up the threading and applied some thick silicone oil and bolted it back in. Then checked for the leak after refilling the tank and it appeared, problem solved. There’s actually a spare O-ring that comes in the kit number 26 but I didn’t use it yet. crossing my fingers and will check back in in a couple weeks to see if the problem reoccurs

 

[MrP]

I ended up taking the valve out and inspected the O-ring, which looked to be fine. Inspected the plastic valve. There were no cracks or blemishes iso I cleaned up the threading and applied some thick silicone oil and bolted it back in. Then checked for the leak after refilling the tank and it appeared, problem solved. There’s actually a spare O-ring that comes in the kit number 26 but I didn’t use it yet. crossing my fingers and will check back in in a couple weeks to see if the problem reoccurs

That's great. Is accessing the valve easy to accomplish? I'm looking at that picture - that hexagonal bit unscrews I take it?

 

[Massiemax]

That's great. Is accessing the valve easy to accomplish? I'm looking at that picture - that hexagonal bit unscrews I take it?

Yes-there are a couple of videos on YouTube that explain the disassembly

 

[Ach3r0n]

Yes-there are a couple of videos on YouTube that explain the disassembly

Gregor made a good one.

PS: If he would make something similar, but focusing on the most common leaks, and how to resolve them...that would be awesome.

 

[Ach3r0n]

Found the leakView attachment 478824

I think mine has the same problem. -50 bars in a couple of days.

 

[Ach3r0n]

I ended up taking the valve out and inspected the O-ring, which looked to be fine. Inspected the plastic valve. There were no cracks or blemishes iso I cleaned up the threading and applied some thick silicone oil and bolted it back in. Then checked for the leak after refilling the tank and it appeared, problem solved. There’s actually a spare O-ring that comes in the kit number 26 but I didn’t use it yet. crossing my fingers and will check back in in a couple weeks to see if the problem reoccurs

Could you point me in direction? I read your description, but I know myself enough. I need a video, or pics. If I disassemble without that, then maybe I will screw up even more.
You took out the valve. Which valve? Where is that? You have to degas it for this whole process, right?

Edit: You did all this? (00:33:10)

 

[Massiemax]

Update-so after 8 days, my gauge went from 32.5 to 32; a really small leak but nevertheless a leak but in a different spot this time. I ripped the gun apart further and found a damaged o ring under the gauge.

 

[grouch-o]

Found the leakView attachment 478824

i had very similar situation, and got a new part from the supplier. but in the end greasing and properly tighten the big nut helped and the gun held 350bar for over a month.

 

[JungleShooter]

The OP is asking us to report
"any issues or problems with Huben GK1"....

Well, yeah, I would like to report TWO issues or problems with my Huben GK1:



Somehow, whenever switching from shooting my regular PCPs to shooting with the GK1, the Huben causes some kind of problem with the pellet tins.
They go from "full" to "half-full" to "empty" at an alarmingly rapid rate.
I can't say I'm not concerned.
(I'm sure it has nothing to do with the flawlessly working semi-auto function of this pistol.)



The other issue or problem the GK1 is causing came out after a good while of owning the gun. I discovered this problem when I took it out for its first hunt.
The GK1 (particularly with a dot scope) causes speedy death at a devastating rate, even when used offhanded (a skill at which I'm still a beginner).
(I'm sure this problem has nothing to do with the GK1's precision and nimble handling due to its size and weight.)


I'm pretty sure both of these issues or problems have no solution (other than getting rid of the gun).
And that won't happen anytime soon.

Matthias

 

[Massiemax]

Lol-ya-I think I have this problem also

 

[Ach3r0n]

I think mine has the same problem. -50 bars in a couple of days.

I changed the o-ring here...still leaking this pos!
Same place, same way. But now -40bars in 1/2 day.
Oh, and by the way the customer service told me that:

"...the leaks are not covered by the warranty but if you get a leaky gun then we can take care of it."

 

[steve-l]

I changed the o-ring here...still leaking this pos!
Same place, same way. But now -40bars in 1/2 day.
Oh, and by the way the customer service told me that:

"...the leaks are not covered by the warranty but if you get a leaky gun then we can take care of it."

Psst! Here is a valuable clue. All air guns will leak sooner or later. "O" rings are a consumable. If you want to shoot these, you better be ready to change them out from time to time.

 

[Ach3r0n]

Psst! Here is a valuable clue. All air guns will leak sooner or later. "O" rings are a consumable. If you want to shoot these, you better be ready to change them out from time to time.

This was leaking out of the box.
...and as I said, I changed the o-ring to a new one. So what else should I do now?

 

[Massiemax]

If you’ve changed the oring, and checked/cleaned the threading and tightened the bolt (wish there were torque specs), then i would either inform huben of the possible defect and send it in, or I would buy a new bolt. I’m wondering if some kind of RTV would also help?

 

[MrP]

Here is my one gk1 issue so far: the rear sight blade assembly is apparently fragile - somehow the tongue popped out of the horizontal windage groove and is no longer retained in the track. No idea when it happened - i guess some minor bump happened at just the right angle to damage it. Anyway - protect that rear sight blade.