So I built a hydraulic pump today

[Supermario]

Originally Posted by RCP57

My models are all 1/10 scale so they need a little more juice than most but I would be happy with this if it would make 200psi. My Volvo excavator runs over 425psi but it all depends on cylinder size and what you expect it to be able to do.

Thanks
Reg

Wow! 425psi! I never realized that some RCs run at that high of a pressure! That's close to pilot pressure on a 1:1 excavator

I don't deal with microscopic pumps like this at work but I know that to prevent pump cavitation a safe rule is 3:1 inlet size vs outlet. The fact that this is a gear pump a 2:1 ratio is fine just like Joe said 8mm inlet / 4mm outlet.

Any chance of using a lip seal for the shaft instead of. O rings? Do you have enough material to mill a bore for a lip seal? I can think of a few items that use a 1/8th shaft lip seal at work.
I'll see if they have one in the parts dept tomorrow, take a picture and send to ya.

Mario

[Supermario]

Reg, thought about it some more, with a shaft that small, it's not a lip seal but a oring for sure. Like I said, I'll check and see what I can find for you.

Mario