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Seac asso 75 o-ring replacement

J

JCOOK417

New Member
Jul 17, 2022
6
0
1
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I need to replace my o-rings in my seac asso 75. Looking for information on how to do it and o-ring sizes please! I've had the gun for about a year and never used(tried to) it until today. It had no pressure! I'm assuming it's because it was in my motorhome (not being used) and 100°+ temps ruined the o-rings because when I tried to pump it up, the air would just leak out. Any info/sites would be greatly appreciated!
 
vrokhlenko

vrokhlenko

Well-Known Member
Sep 22, 2002
286
75
118
57
Determine where the leak is first - try to pump it under water and see where the bubbles are coming from. It could be your pump is bad and not the gun. I suspect it is a pump, after that - the part where you screw in your pump in the back of the gun. There are two types of o-rings- those that move and those that don't. If a stationary oring is bad - it is easier to replace even if can not find an identical size. Moving ones should be a perfect match
By the way, if you really need it:
 
Last edited:
J

JCOOK417

New Member
Jul 17, 2022
6
0
1
38
Determine where the leak is first - try to pump it under water and see where the bubbles are coming from. It could be your pump is bad and not the gun. I suspect it is a pump, after that - the part where you screw in your pump in the back of the gun. There are two types of o-rings- those that move and those that don't. If a stationary oring is bad - it is easier to replace even if can not find an identical size. Moving ones should be a perfect match
By the way, if you really need it:
Thanks for the response. Yeah, it is leaking out of where the pump screws into! After a few pumps I'll hear it leaking out the small hole in pump at end close to handle when it's fully extended, and then I unscrew the pump to hear air leaking out of where the pump screws into gun.
 
vrokhlenko

vrokhlenko

Well-Known Member
Sep 22, 2002
286
75
118
57
In this case it is probably an o-ring at the very end of your pump. Inspect it. If not - the valve in the back has to be replaced
 
J

JCOOK417

New Member
Jul 17, 2022
6
0
1
38
In this case it is probably an o-ring at the very end of your pump. Inspect it. If not - the valve in the back has to be replaced
You know of any info on how to do that? My first pneumatic and couldn't find any information online about replacing or o-ring sizes?
 
vrokhlenko

vrokhlenko

Well-Known Member
Sep 22, 2002
286
75
118
57
You know of any info on how to do that? My first pneumatic and couldn't find any information online about replacing or o-ring sizes?
Dude, I can not do it for you remotely :) I have no idea what size is o-ring on the end of your pump but it is most definitely metric.The end of your pump where thread is and an o-ring sits is press-fit into the body of the pump. Usually it fails and you can not pump any more - the air leaks. If you can grab that end and feel that it does not sit tight in the body of the pump - you need a new pump. I made my own because of that.
 
J

JCOOK417

New Member
Jul 17, 2022
6
0
1
38
Dude, I can not do it for you remotely :) I have no idea what size is o-ring on the end of your pump but it is most definitely metric.The end of your pump where thread is and an o-ring sits is press-fit into the body of the pump. Usually it fails and you can not pump any more - the air leaks. If you can grab that end and feel that it does not sit tight in the body of the pump - you need a new pump. I made my own because of that.
It's not the pump man. Air is leaking from the gun where you screw the pump into it at. Thanks for you help though man!
 
vrokhlenko

vrokhlenko

Well-Known Member
Sep 22, 2002
286
75
118
57
Like I said, if the o-ring on the end of the pump is bad - you will get a leak. However if it is not the case - here is what you need: https://4diving.com/diving_en/seac-rear-valve-body. release air from the gun, unscrew the old valve and screw in the new one. You also would need the o-ring kit I believe. To unscrew the valve you would need to build a tool - tough to do it with a flat-head screwdriver.
Also take a look here: https://www.tradeinn.com/diveinn/en...hierarchicalCategories.eng.lvl1][0]=Spearguns
Those valves are interchangeable.
 
J

JCOOK417

New Member
Jul 17, 2022
6
0
1
38
Like I said, if the o-ring on the end of the pump is bad - you will get a leak. However if it is not the case - here is what you need: https://4diving.com/diving_en/seac-rear-valve-body. release air from the gun, unscrew the old valve and screw in the new one. You also would need the o-ring kit I believe. To unscrew the valve you would need to build a tool - tough to do it with a flat-head screwdriver.
Also take a look here: https://www.tradeinn.com/diveinn/en/seac-asso-o-ring-kit/138354229/p?products_search[query]=valve&products_search[hierarchicalMenu][hierarchicalCategories.eng.lvl1][0]=Spearguns
Those valves are interchangeable.
The gun itself is leaking when pump isn't on it.
Much appreciation man! Thank you!
 
Jon305

Jon305

Member
Jan 21, 2020
81
20
23
Hey i have a seac asso 115, they sell the full oring replacement kit on amazon and ebay with everything even the piston skirt, if youre leaking air from where you screw the pump it's probably the little ball valve, ive had it happen to me, just make sure the gun is depressurized and unscrew the back of it with a 3/4 chisel if im not mistake, you can see the pump screw hole has these 2 slits on either side, once you do that theres a little spring and ball mechanism in the piece you unscrewed, just take it apart, clean and oil, and should be good, if not repeat that process but also change the rings with the kit i mentioned
 
Jon305

Jon305

Member
Jan 21, 2020
81
20
23
Theres a video on youtube of a guy taking apart a mares cyrano and its the same thing as the seac so just use that as a guide, its super easy so dont be afraid, just have the o ring kit ready and some silicone grease, and speargun oil to refill the gun, again a guide for refilling you can find on you tube
 
Jon305

Jon305

Member
Jan 21, 2020
81
20
23


Thats for the refill



And that's for the disassembly, again its the same for the seac asso
 
J

JCOOK417

New Member
Jul 17, 2022
6
0
1
38
Hey i have a seac asso 115, they sell the full oring replacement kit on amazon and ebay with everything even the piston skirt, if youre leaking air from where you screw the pump it's probably the little ball valve, ive had it happen to me, just make sure the gun is depressurized and unscrew the back of it with a 3/4 chisel if im not mistake, you can see the pump screw hole has these 2 slits on either side, once you do that theres a little spring and ball mechanism in the piece you unscrewed, just take it apart, clean and oil, and should be good, if not repeat that process but also change the rings with the kit i mentioned
Thank you man!!!
 
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