benjamin pump

[ten.ring]

i got my first p.c.p.  since 1996.    a .22 disco    got to love it!

i have had very few mechanical things in my life  (starting at about 8yrs old)  that i did not feel a need to change something about it. most of the time alot of things need changing.

after i pumped the disco up about 15 times i noticed that the pump was not building pressure as fast as it had been.  i had the urge to tare it down   so.. i did!
i did alot of polishing  probably un necessary  but i was compelled.
i found an o'ring that was slightly torn. on tuesday i called sun optics  (they designed and have it built) after emailing the reciept from airgun depot they mailed me a set of o'rings right away.  they said the new orings were an up grade that is just now comming out.

if you are having trouble with your pump. it could be water

i found there was a lot of water in the pump after only 15 fill-ups.  it's texas and about 55% humdity.  so here is what i came up with.

i got a package of rem-dry any gunsafe desiccant will do ($10)  i put all of the desiccant in a 1L water bottle ($2). used some tubing, a fuel filter ($2), fittings,... well here are some pic's  they should tell the whole story.  after filling the gun 20 times with the dryer i tore down the pump  NO MORE WATTER. i tried a disiccant for an aircompressor but it was too small to give the disiccant time to remove all the water. the dry air comes out of the dryer thru the filter and into the pump.  i loop the tube back onto the inlet of the dryer to store it. and put a automotive vacuum cap on the pump intake nipple. the air inside the dryer gets very dry between fill-ups and while pumpng.

the gun is geat out of the box  but that will not stop me from mods on it..  but if you want a great gun  not just for the money  but just a great gun  and you do not want to mod in any way get one   

[HeadOfPoland]

I'm sure I'll be able to use this once I get a PCP! Good write up

[DKT88]

Ingenious.

[markasaurus]

That's a very clever design you have there and you have proven it works...bravo!  I bought a hill pump, used, and every time i take it apart i find water even though it has the desiccant filter....but who wants to spend $20 changing the desiccant every two months?! 
Hill says to not use any other desiccant then what they recommend, they say out has the wrong properties for air flowing in fast or something...but clearly your device works with it though!  Tell me do you think the clear fuel filter is an important part?  Do you see any water getting caught in it?

[Brewerja]

Hey fellas, i bought an "inline" little dessicant filter from harbor freightfor like 4 bucks and alme attatchments from ace hardware to screw it into my pump. Anyway, i have been reusing the same dessicant material for over a year now! It starts out blue and turns pink when it is saturated with water. What i do is,... Disassemble the filter and carefully empty the contents into a little "bowl" or cup i made out of foil and pop that baby in the toaster oven at about 250* to redry the stuff. Works great, i have done it 5 or 6 times to the same batch and it always works every time!! Also, if your lazy, harbor freight sells a 20lb bag of dessicant beads for like $18 i think. Just make sure to keep the big old bag in an air tight container (ammo can) for storage purposes. The dryer definatly keeps the goop out of my pump and gun clean and dry inside.

[ten.ring]

silica desiccant is silica desiccant it is all the same only differance is whether it changes color  which is because it has an alloy in it to make it change at 40% of it's capacity.   all of it is renewable  200deg  till its dry.

i use the filter as a extra precaution  with it nothing can come out of the canister into the pump.   99 to 100% improvement over the little units hill sells.  if you like your little unit keep it but recharge your discant till it's blue agian.  the rem-dry has alot of black dust so the filter is twice as nice  but it would be there even if the desiccant was not dusty.

there is so much desiccant in this set-up i may never have to recharge it.  but make shure it stays closed up when your not pumping.

hill is correct disecaant does take time to absorb the water so the bigger the canister the more desiccant the better it will dry.

mark

[markasaurus]

Hey fellas, i bought an "inline" little dessicant filter from harbor freightfor like 4 bucks and alme attatchments from ace hardware to screw it into my pump. Anyway, i have been reusing the same dessicant material for over a year now! It starts out blue and turns pink when it is saturated with water. What i do is,... Disassemble the filter and carefully empty the contents into a little "bowl" or cup i made out of foil and pop that baby in the toaster oven at about 250* to redry the stuff. Works great, i have done it 5 or 6 times to the same batch and it always works every time!! Also, if your lazy, harbor freight sells a 20lb bag of dessicant beads for like $18 i think. Just make sure to keep the big old bag in an air tight container (ammo can) for storage purposes. The dryer definatly keeps the goop out of my pump and gun clean and dry inside.

i must have seen a different filter then you, the only ones i saw had a warning "90 psi max" .  Obviously this will not work for airing up my p rod to 2900 psi, do you have a link to the one you have?

[Ol'DeadEye]

The filter goes on the suction side (intake) of the pump, not the pressure side (output)...

Remove the sintered bronze screen to install the filter.

[nervoustrigger]

Fantastic design, thanks for sharing!  Simple, cheap, and effective.  Can't beat that!

I picked up parts to build one of these filters this evening.  My first PCP is on the way from Mike Melick and I want to take good care of it so this is perfect.

[drewciferpike]

flagging for follow-up... my dad's getting a QB from MM, and will be HPA. This will be great for the pump.

Thanks for posting!

[nervoustrigger]

Drew,

Just FYI that last night I posted some instructions in the following thread on building a drier/filter based on tenring's design .  Sounds like your dad will have a Xisico pump like me.  The instructions have a few details that are specific to that pump so you may want to check it out.

http://www.gatewaytoairguns.org/GTA/index.php?topic=42922.0

[drewciferpike]

haha... I found them! It's great that you linked here, though. I've been trying to make sure that I have everything set up for him, so finding your links was AWESOME.

[CptMoonlight]

I need to try this