I'm building a power pack and a press for my youtube channel and I've gotta say you single handedly made this possible for me I binged watched most of you hydraulic videos and went from knowing nothing to actually feeling like I understand this stuff, from the pumps to the valves to the cylinders......great job man really good stuff and your sense of humor helps too.....thanks man!........"can't i just turn up the pump to get more pressure?" J/k haha
I have been working on a Hurst Hydraulic pump for myself that wouldn't put out but 3,000 psi. They are pretty closely related to an Enerpac I do believe, and I did find out it's a 10,000 psi pump with 5,000 max prv. They are nothing like any of these TH-cam videos and they are very hard, to impossible to find info on. I have owned and wrenced heavy equipment for 30 years and I have never seen anything like them. They have 2 open piston pump submerged in the tank with a rotating cam in the center. They are 2 stages, yet those those piston pumps are the same volume and pressure. They use a directional hand valve to close the loop to dump and supply the actuator, and then they dump through a manifold with a type of unloader that can dump a little and send some pressure back to the pumps assisting them with creating the 2nd lower volume high pressure stage. Or the valve can open a little farther and can dump all pressure back to tank unpressurized. When the directional valve is dumped it just shoots everything back to tank. I found the spring in the unloader to be broken. Someone apparently had it too tight because even with a broken spring it still wouldn't unload and was stalling the engine. Or it could be that the spring broke and it was unloading all the time and they tightened it way up thinking it was the prv. Either way, I couldn't find that spring or valve so I made an angled spacer to fit where the end of the spring was broken off. I bumped up the prv and started backing down the unloader and I am getting 5,000 psi now, about 6,000 at crack, but its still tugging on the 5hp Honda pretty good. But it was choking it plumb off. Everytime I back down the unloader it helps a little, but if I go too far it will just unload everything to the tank, no pressure will even make it to the actuator. The popet spool has an undercut that has to center up while resisting spring pressure. Too far either way under full load and you will have poor performance. Its time consuming because the one big difference is all adjustments are submerged in the tank, unlike Enerpac. Guess they didn't want joe blow fireman turning sets, and changing pressures. It's a strange little unit but I think im figuring it out.
it is always recommended for the pump to be typically installed within the reservoir? Not sure if the intend is to go for internal unless system constrains require external
I have a HPU that sputters when first starting, it was very low on oil so I filled it, any chance you could give me a short cut to troubleshooting… it’s for a cardboard compactor. Works good just does a quick hard studder at first and before I filled it some cycles it sputtered and and stopped…
Hard saying but check if the suction line is collapsed/collapsing during start. Potential cavitation event. Check out here for details: th-cam.com/video/TBxMgGq3O94/w-d-xo.html
I'm building a power pack and a press for my youtube channel and I've gotta say you single handedly made this possible for me I binged watched most of you hydraulic videos and went from knowing nothing to actually feeling like I understand this stuff, from the pumps to the valves to the cylinders......great job man really good stuff and your sense of humor helps too.....thanks man!........"can't i just turn up the pump to get more pressure?" J/k haha
Thanks for saying "rotational speed, often measured in RPM" instead of just "the RPM".
Excellent, simple explanation to the uniformed
please more on pumps and hydraulic power units (ie. multistage pumps) - this is great
Thanks a lot for the video, it was very helpful and very informative, thank you so much.
I have been working on a Hurst Hydraulic pump for myself that wouldn't put out but 3,000 psi. They are pretty closely related to an Enerpac I do believe, and I did find out it's a 10,000 psi pump with 5,000 max prv. They are nothing like any of these TH-cam videos and they are very hard, to impossible to find info on. I have owned and wrenced heavy equipment for 30 years and I have never seen anything like them. They have 2 open piston pump submerged in the tank with a rotating cam in the center. They are 2 stages, yet those those piston pumps are the same volume and pressure. They use a directional hand valve to close the loop to dump and supply the actuator, and then they dump through a manifold with a type of unloader that can dump a little and send some pressure back to the pumps assisting them with creating the 2nd lower volume high pressure stage. Or the valve can open a little farther and can dump all pressure back to tank unpressurized. When the directional valve is dumped it just shoots everything back to tank. I found the spring in the unloader to be broken. Someone apparently had it too tight because even with a broken spring it still wouldn't unload and was stalling the engine. Or it could be that the spring broke and it was unloading all the time and they tightened it way up thinking it was the prv. Either way, I couldn't find that spring or valve so I made an angled spacer to fit where the end of the spring was broken off. I bumped up the prv and started backing down the unloader and I am getting 5,000 psi now, about 6,000 at crack, but its still tugging on the 5hp Honda pretty good. But it was choking it plumb off. Everytime I back down the unloader it helps a little, but if I go too far it will just unload everything to the tank, no pressure will even make it to the actuator. The popet spool has an undercut that has to center up while resisting spring pressure. Too far either way under full load and you will have poor performance. Its time consuming because the one big difference is all adjustments are submerged in the tank, unlike Enerpac. Guess they didn't want joe blow fireman turning sets, and changing pressures. It's a strange little unit but I think im figuring it out.
it is always recommended for the pump to be typically installed within the reservoir? Not sure if the intend is to go for internal unless system constrains require external
Depends on manufacturer and application.
thank you
Muito bom, obrigado por compartilhar.
I have a HPU that sputters when first starting, it was very low on oil so I filled it, any chance you could give me a short cut to troubleshooting… it’s for a cardboard compactor. Works good just does a quick hard studder at first and before I filled it some cycles it sputtered and and stopped…
Hard saying but check if the suction line is collapsed/collapsing during start. Potential cavitation event. Check out here for details: th-cam.com/video/TBxMgGq3O94/w-d-xo.html
@@bigbadtech thanks a lot! Really appreciate it I’ll watch that video I just gotta learn more!
Super please explain schematic circuit diagram of Hpu and whcp
Thanks mate
asesome