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Sm750 Problems

broken check valve? fucked up pump? i dont know...

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#1 Kyrativ

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Posted 30 December 2008 - 12:55 AM

So I recently got a SM750 old version and I was modding it, I gave it a 6 inch PETG barrel and plugged the pump, there were 2 small leaks where the pump tube connects to the tank so I sealed those up. I pumped it and shot it twice before i put it back together and it was working fine, however when I screwed together and tried to shoot it problems arose. I pumped it 44 times and it made tiny noise of air shooting out the tank. soon after it wasn't pumping properly, i would pump it but the pump would shoot out half-way when i pushed it forward nothing really happened as soon as i let go it would shoot out again. I figured there was either a leak or a broken check valve, I filled up my sink and pumped it but no leaks came up. then I thought it was a problem with the check valve so i removed all the hot glue from the pump hoping it would get the check valve working again, but that didn't work either, now I'm here and I've got an old rare fucked up gun upstairs and Im rather discouraged, is it possible to fix this or am I totally screwed?
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#2 mystefansdontflystraight

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Posted 30 December 2008 - 09:30 AM

Fuck man 44 times? I hope that is a typo. I told you to pump the thing 4 times. Yeah, 44 times would shoot the check valve to hell. That's likely your problem. I know you can buy check valves from McMaster.
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QUOTE(Blacksunshine @ Dec 24 2009, 02:15 PM) View Post

QUOTE(white moonlight @ Dec 23 2009, 01:29 PM) View Post

It's just screaming to be rearloading...

I seen a movie about that once.



#3 umpshaplapa

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Posted 30 December 2008 - 12:16 PM

Fuck man 44 times? I hope that is a typo. I told you to pump the thing 4 times. Yeah, 44 times would shoot the check valve to hell. That's likely your problem. I know you can buy check valves from McMaster.

I think his tank would explode before the valve died.
The same thing happened to me with an AT2k pump. The pump would shoot back out if you tried to pump it. But ya, it's the check valve in your pump.

Edited by umpshaplapa, 30 December 2008 - 12:16 PM.

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QUOTE(Talio @ Jun 29 2009, 01:50 PM) View Post

i got a black belt in noob banning in 2004.


#4 Kyrativ

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Posted 30 December 2008 - 01:04 PM

Fuck man 44 times? I hope that is a typo. I told you to pump the thing 4 times. Yeah, 44 times would shoot the check valve to hell. That's likely your problem. I know you can buy check valves from McMaster.

I think his tank would explode before the valve died.
The same thing happened to me with an AT2k pump. The pump would shoot back out if you tried to pump it. But ya, it's the check valve in your pump.



Sorry that was a typo, I only pumped it 4 times, Im not retarded. Unfortunately I have got a bigger problem now, the plastic tube that connected the pump to the tank broke in half, is there a way to glue this?
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#5 mystefansdontflystraight

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Posted 31 December 2008 - 12:23 PM

I would take this opportunity and replace the pump. Just goop some tubing into the end of the tank and the end of your pump of choice. A cut down AT2K pump would probably work. If you don't end up fixing it, Ill take the tank off your hands...... Ive got plans.
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QUOTE(Blacksunshine @ Dec 24 2009, 02:15 PM) View Post

QUOTE(white moonlight @ Dec 23 2009, 01:29 PM) View Post

It's just screaming to be rearloading...

I seen a movie about that once.




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