"Jim Wilkins" writes:

"Richard Smith" wrote in message ...


...

Does the pump have some mechanism to throw out air in the system?
Is it "self-bleeding"?

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Oil released from the cylinder to retract the piston flows back into
the pump's reservoir, which needs to be vented to the atmosphere to
relieve pressure or vacuum as oil moves in and out. I have a hand/foot
powered manual hydraulic pump with a hex head reservoir fill and
bleeder screw that the instructions say to slightly open during use.

Ah... The oil separates to the top in the pump's oil reservoir and
can be expelled / displaced with additional oil...