Reply To: FX Pump Rebuild

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dgiannandrea
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Every day a new epiphany. (Using compressed air and four hands to find air passages)

Both holes are air transfer. The larger notches are fresh air intake past the double O-rings (removed) that act as a flap valve. The tiny holes on the right transfer air inside the large piston between the 10mm and 5mm tubes (downstroke.) That air then gets squeezed past the seals on the 5mm hi pressure rod/piston (upstroke) charging the hi pressure chamber.

I will get this verified then re-shoot the process for a final document…just in case I'm not the only one who needs to do this.