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hydraulic power pack question

hydraulic power pack question

(OP)
hello..
i might be in the wrong place with these questions. but im looking to build a hydraulic press. to use when forging .
there are lots of designs’ out there on the web and i think i have most of it all figured out apart from the power pack i have acquired for free
it came off a large road barrier system. operated by a key card system.
and im guessing that the hydraulic ram must had a spring return ram [ that and the Wight of the retractable barrier]
as on the power pack i have there is only one hydraulic line going out .
i have got a photo here and just a have a few questions as the people at the local merchants weren’t much help at all
SO FEEL FREE TO TELL ME I HGAVE IT ALL WRONG as im just trying to logically work it out from scratch
https://ibb.co/c6z9e5
https://ibb.co/hj0hz5

form the photo im assuming that that it operates this way
"D" is my line out , activated by
"C" a 24v solenoid
"E" is a return path to the oil chamber . the valve im told was so they could keep the barrier down during events
[leaving it open would create a bypass ]
"B" behind the cab there is a screwdriver slot? is that for adjusting pressure ?
"A" is another 24v solenoid and i have no idea what’s it does
the gauge is stuck at 600spi but i imagine that’s the static amount of pressure when it’s all switched off
i have re pipeed it , so instead of "C" there is just a gauge on it . the pump ran and didn’t sound any different , i don’t know if there is air in the line and needs priming somehow. or it is something to do with solenoid A needing to be open ?

i intend to have a set up were the pump feeds a shuttle valve [ came off an old tractor ] that can feed a ram to open / close
made with all new hoses and with some thick 15mm angle iron i have
although the gauge only goes to 14000 psi i assume the adjustment on "B" will get me more ?
apart from the motor there is no spec on the unit.
i can find on line, a v simmiler unit for the same intended use inc motor ,has a small 1.1kw 3~ motor will run at 25000 which is more what i think need get ram with about a 4" diameter to be able to get me about 15 ton of force which is the min i will need really

if anyone can give me some advise on this it would be great

RE: hydraulic power pack question

It would be easier if you drew out the circuit because it is difficult to see what is connected to what.

However as far as I can work out,
A appears to be a solenoid which combed the motor output shaft to the hydraulic pump.
B could be the internal pressure relief valve or some sorry of volume flow control
C I think is the return flow back to the oil tank
D is your outlet and return fliw hose
E with the quarter turn valve is actually the high pressure feed from hydraulic pump. I guess that when they manually turned it closed then even if the card was activated and solenoid A activated then there was no flow and it would all go through the pressure relief valve B

I think your guage is just broken.

That's my best guess but some more amnesty might explain it a bit more.

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