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Faunsdale, AL | Air would not extend the second cylinder in the series circuit.
When you hit the lever to raise the machine fluid goes in the end of the first cylinder and is supposed to push its piston forcing the oil trapped on the other side of the piston out and into the second cylinder thereby moving its piston and expelling the air on the other side of it out the vent on the cylinder.
Since the second cylinder moves without the first one, oil is bypassing the first cylinder’s piston.
It’s not a tie rod cylinder is it? Tie rod cylinders can be reassembled with the bypass port end of the barrel toward the wrong end. Then they bypass as soon as oil gets to the cylinder. Bypass/rephasing ports are small enough that any normal capacity hydraulic system will build enough pressure to move the piston off the bypass area and then the bypassing should cease.
You have a blown piston seal or a swelled cylinder that’s creating a fast leak.
You might try jacking the machine up a little and using some stops to prevent the master cylinder from collapsing/lowering completely in case there’s some problem that allows it to bypass oil only when the piston is at the end of the cylinder. If that helps, then the question is can you live with it only lowering to the height the stops hold it at.
Edited by ccjersey 6/30/2020 13:12
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Cylinder not moving
