Recent content by cparke

Ok, so we're saying the seal should be able build up a bigger vacuum without a fluid seeping back into the reservoir? So to fix this, I would have to fully disassemble the pump itself and remove the cylinder? I guess we're talking about the seal the bottle of the cylinder or something called...

I know it works without issue with fill cap off and these issues are vacuum/air pressure related issues. Fluid level an ambient air volume is all I can really modify. It's surely air tight and seals are working (leak-down passes).

Jack hasn't been overfilled very long. I drained it recently and then filled with new fluid, which is why I'm concern now about proper fill level, because I've never done something like this before. I also just changed the o-rings as part of this tune-up. Jack and has been in periodic use for...

I guess it's a delicate balance as I understand it. Too much fluid means less air in the reservoir and a stronger vacuum when lifted. Plunger up when jack is lowered is probably a good thing actually to allow extra air to sit above the reservoir, causing less vacuum to develop while lifting...

I changed the o-rings on the release valve and the piston, and that seems to have resolved the oil leak from the release valve when lowering and the apparent constant air buildup in the reservoir when trying to bleed. So I am left now with with one last puzzle; air pressure vs. reservoir fluid...

The type of metal really matters as far as what to do. Cracking it loose is the hardest part. I tried removing a stuck bleeder valve on the car's wheel caliper and the head broke off. Luckily the way these are designed, they won't release brake fluid even with the head missing. Either need...

Very helpful replies from both of you. Thank you so much! Very revealing about how this thing really works and how these issues cause problems.

I know these are classic questions, but the instructions and advice I found still keep me puzzled. I changed the oil in my floor jack, because the old oil had become black and watery. I did not understand from bleeding instructions that the cylinder must not be full. That means, of course...

I have this same Harbor Freight (HF) 2 ton jack and made this same mistake today, sort of. The jack in question is pictured and featured in this repair video: I thought the adjust value was also the fill valve, since the actual fill valve is painted over red and looks like it is just part of...