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Rf20 Pump Problem


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#1 Zaxbys

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Posted 01 August 2007 - 10:10 AM

I recently went to a yard sale and picked up a Tek 10 as well as a Rapid Fire 20 for 50cents. The only problems with the guns is that the RF20 wouldnt pump. But for 50cents I thought it would be a good deal either way. So I got home and searched the topic and came up with this:

http://www.nerfhq.co...hp?topic=4066.0

This is the same exact problem I am having with mine. I tried putting a little E-tape around the pump head but I am getting I think to be "too good of a seal" in that it sucks the air back out on the outward stroke.

I thought that together we could solve this problem.

Here are some pictures:

Posted Image

Posted Image

Notice: the black ring was off when I opened up the gun.

Edit:

Here is a picture of the pump head.
Posted Image

Edited by Zaxbys, 01 August 2007 - 10:46 AM.

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#2 shadowkid33

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Posted 01 August 2007 - 10:16 AM

Try making sure all the tubing is connected to the bladder correctly. Pump it up and feel for leaks around all the tubing conecting the pump shaft to the bladder.
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#3 monkey with a nf

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Posted 01 August 2007 - 10:19 AM

Go ahead and take the e-tape off, as it will only keep it from working (if the pump works the way I think it does, then the o-ring needs to be able to slide on the pump head). Check to make sure the o-ring isn't cracked or dried out, as that would create seal problems.

Also, by this, do you mean that it leaks, or you can't pressurize any air? It might help if you can give us a picture of the pump head (assuming it's removable; I've never opened a RF20).
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QUOTE(Pineapple @ Sep 12 2007, 03:13 PM) View Post

For maximum efficiency?


1. Pump up. Count how many pumps.

2. Keep going until you hear a loud "bang".

3. Subtract one pump from the total. Rebuild your air bladder.


There you go.

#4 Zaxbys

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Posted 01 August 2007 - 10:47 AM

I removed the E-tape and posted a picture of the pump head. The O-ring is not cracked but it does feel dryer than usual and is not oily like it usually feels.
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#5 General Cole

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Posted 01 August 2007 - 11:58 AM

Lube it up dude. Then check to make sure something is clogging the OPV, I think it has one.
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#6 Carbon

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Posted 01 August 2007 - 12:22 PM

It sounds like the e-tape plugged the check valve holes in the plunger head. Either just lube up the old o-ring, or get a new one.
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#7 Zaxbys

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Posted 01 August 2007 - 01:13 PM

I tried lubing the head, but it just made it run smoother down the tube, but there no resistance or air being pushed through anywhere.
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#8 monkey with a nf

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Posted 01 August 2007 - 02:59 PM

It looks like the check valve holes might have been plugged. Check the pump head- there should be three holes. Only the center one should be plugged.
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QUOTE(Pineapple @ Sep 12 2007, 03:13 PM) View Post

For maximum efficiency?


1. Pump up. Count how many pumps.

2. Keep going until you hear a loud "bang".

3. Subtract one pump from the total. Rebuild your air bladder.


There you go.

#9 Prometheus

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Posted 01 August 2007 - 04:31 PM

Immerse it in water and and pump once (push handle in) to check for leaks. dOn't pull the handle back out, as in can draw in water, and possibly screw things up.
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#10 BustaNinja

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Posted 01 August 2007 - 05:47 PM

Immerse it in water and and pump once (push handle in) to check for leaks. dOn't pull the handle back out, as in can draw in water, and possibly screw things up.


It can cause probalems only on certain guns. I pumped water through my titan to find a leak. (Which it was only the sound of the air moving, no leak) and all it did to my gun was make it look like it was smoking after every shot. It has the really satisfying line of steam come out and it looks sweet.
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