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Tetra Strike Pump Replacement

Getting rid of the crappy volume stock pump

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#1 snakerbot

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Posted 28 September 2010 - 12:43 AM

I acquired a tetra strike the other day and was really disappointed with how many pumps it took to get it to decent pressure. I had a space airtech 2000 pump laying around, so I decided to do a replacement. Without further ado, let's get started.

What you need:
Tetra strike
Airtech 2000 pump
small (1.5-2") section of 5/16th" vinyl tubing.
epoxy
hot glue

To start with, open up your tetra strike. This was slightly non-trivial with the sealed pump cap, but that came off pretty easily with pipe cutters. The light green grip on the handle came off with a flathead screwdriver. Here's what the internals should look like.
Posted Image

Remove the pump/tank/barrel assembly. It isn't held on with anything so it'll just come out. Next, cut at these two points.
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You won't need the pump, but you will want to keep the L-shaped piece.

Next, cut off you AT2k pump tube right where the yellow stock tubing meets the pump tube.
Posted Image

Insert the vinyl tubing into the 'L' piece. It's a tight fit, but you won't need to widen the hole in the L any.
Posted Image

Now fit the other end of the L over the stub coming out of the AT2k pump tube. This will require a tiny bit of sanding on the outside of the stub.
Posted Image

From here you can insert the other end of the tubing into the tank assembly . I don't have exact measurements for how long the tubing needs to be, so guess long and keep cutting a little bit off until it fits properly in the shell.
Posted Image

One thing of note: There is a little tab coming out of one side of the shell. This tab used to hold the pump in place, but now just gets in the way, so get rid of it. Sorry for the overexposure, but you should be able to see a white line near the center. This is where the tab used to be.
Posted Image

Now just epoxy all the joints to make it airtight, and reassemble. The green grip piece will just snap back on. You will want to use hot glue or something to hold the pump in place, but the rest of the tank assembly will stay put without any work. Make sure all the spacers on the firing pins are behind the trigger. You can see in the first picture, the third from the top is not right. You should also probably glue the AT2k pump cap on (don't forget to plug the pump first). I replaced the barrels with 4" of cpvc as well.
Posted Image

There you have it. I usually pump it 8-10 times. It could probably take more, but at 10 the trigger pull is already pretty hard. I usually end up firing the first two barrels at the same time since it takes too much force to pull the trigger, and I can't stop before the second is already fired.
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#2 Jaayman500

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Posted 28 September 2010 - 01:51 PM

Great job replacing the pump, also what are the ranges?
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#3 kidame tomanaka

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Posted 28 September 2010 - 03:15 PM

to bad i didnt have this before, my friends tetra just broke D: pump connection and all !
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#4 HappyBurnination

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Posted 28 September 2010 - 06:45 PM

Great job replacing the pump, also what are the ranges?


All he did was replace the pump, the ranges should be about the same as a pump plugged Tetra Strike.
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#5 Jaayman500

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Posted 28 September 2010 - 07:08 PM

Great job replacing the pump, also what are the ranges?


All he did was replace the pump, the ranges should be about the same as a pump plugged Tetra Strike.

I asked because he also added cpvc barrels.
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#6 TxNerfer

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Posted 28 September 2010 - 08:38 PM

Replacing the pump should give better ranges because as Ryan demonstrated with the 3k and other various airguns, a smaller diameter pump allows for higher pressures in the airtanks. If the 2k pump has a smaller diameter, then it should give better ranges, especially with a barrel replacement. I'm sure Zorn could come up with a much more scientifical explanation.
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#7 snakerbot

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Posted 28 September 2010 - 09:54 PM

The 2k pump is almost imperceptibly smaller than the stock pump, (ie, the stock pump fits in the 2k tube, but it's tight), so I doubt that should do anything. I initially didn't include ranges because the barrels weren't part of the writeup, but if you guys want them, here they are. Tested indoors using bb-weighted stefans with a roughly airgun fit in cpvc. Using the not-at-all-scientific method of having friends stand down the hall and watching the grouping of the individual barrels, then measuring to those. I don't have a long tape, so this is the best I can do, since I didn't want to measure these distances so many times with a 12' tape.

The top and bottom barrels get about 62', and the middle two get about 43'. I can pick up a longer tape and give some more accurate results later if you guys want.
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