Pluming & wiring Hydraulics for brake press

As soon as I looked at that I knew that not only do we need a wiring schematic it would be nice to have a port schematic on the hydraulic valve control, which ports are used when the solenoid is opened then if you get it back working let us know what they did , thanks



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The guy couldn't figure it out(don't think he really tried) So it's back to figuring it out with you guys.
 
Charley Davidson said:
What are the 2 black things on the pump block?
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Those are cartridge valves of some sort, could be anything. My votes for the 2 most likely possibilities are (vote #1) adjustable orifice valves for controlling extend/retract speeds, and (vote #2) - manual operators for testing extend/retract.
JOSHUAZ2 said:
the third port confuses me though.

[...]

i believe port 1 and 2 to be regulated outputs and 3 would be the return.
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I don't believe that there would be a visible "return" port since the tank and manifold are integrated. I think that 3rd port served another purpose that we may never know. Some lift gates have a smaller cylinder that performs an "open/close" function that is independent of the "lift/lower" function; could have been for that. Or it could have been to retract some sort of spring-loaded failsafe only if sufficient pressure was present.

If I had this thing sitting on my work bench, I would wire the buttons to the solenoids, attach some clear hoses to all the ports and stuff the hoses back into the fill cap of the reservoir and start pushing buttons... see what happens. You don't absolutely have to know what functions these ports used to serve, you are repurposing. Find what ports work for you. play with the adjustments on the cartridge valves, have a blast. Wear gloves and eye protection ;)
 
Strantor you and i think alike my guess is that the 3rd line goes to a lock if this came off a lift bed , if I had it on the bench it wouldn't take long to figure out a way to wire it but talking someone else through it is a whole new game but i am always willing to put my two cents worth to help


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The point was made that this lift pump would have limited time use because you are using a starter that builds heat and usually only has bushings and not bearings so it would not last long in heavy use if you want to use it for that if you are using it for light use it may last awhile you may be able to fit a 110 or 220 motor in it but the rpms will be too high so you need a reduced speed motor as for the one way pumping all you would need is a hand valve that way you would get rid of having 12v dc and AC motor
But if you wish to use the controller as is plan on putting pull back springs on the cylinder and have a battery and charger and get us a hydraulic schematic, hook 12v to starter and the solenoids and see which ones puts out oil before we can move forward


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Having an up and down switch where the pump runs both ways denotes two way hydraulic flow and a dual acting cylinder. This requires a return for fluid from the cylinder. When i have seen other hydraulic blocks numbered like this the 1 and 2 went to two seperate cylinders and were metered and the 3 return was joined. one solenoid controls fwd/reverse flow the other blocks flow between the two outputs so that one doesn't bleed into the other when power is off.
 
JOSHUAZ2 said:
Having an up and down switch where the pump runs both ways denotes two way hydraulic flow and a dual acting cylinder. This requires a return for fluid from the cylinder. When i have seen other hydraulic blocks numbered like this the 1 and 2 went to two seperate cylinders and were metered and the 3 return was joined. one solenoid controls fwd/reverse flow the other blocks flow between the two outputs so that one doesn't bleed into the other when power is off.
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What do you see there that gives you an indication that the pump runs in 2 directions? I see a solenoid like an automotive starter solenoid, with one side bonded to the chassis ground, which precludes reversing the voltage to it. This pump can only run one direction.

What I've seen in a double acting (single pump direction) system is just like what's shown below:

View attachment 50988

With no voltage applied, the field-side port (ports going to the cylinder) are blocked off, thereby holding the liftgate in current position. With one of the solenoids energized, one of the ports is aligned to the high pressure and one is aligned to the drain (extend). With the other solenoid energized, the opposite port is aligned to high pressure and the opposite to drain (retract).

In the graphic above, 4 ports are shown; commonly referred to "P1" (or A) "P2" (or B) "supply" (or "pressure", "P") and "tank" ("T") In Charley's application, with everything being self-contained, I believe that "supply" and "tank" are integrated into the manifold/tank so you would never see them unless you took everything apart. This leaves us wit "P1" ("A"), "P2" ("B"), and (something else) "P3" ("C").
 
what i meant was that the pump runs for both up and down with a changing in valving for directions. Not that the pump changes directions. sorry for any confusion.
 
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