I'm re-building an EPCO 60 ton 'Garage Press' - I've replaced the double acting piston seal assembly as it was passing oil from one side to the other, but now that's all fixed a fault has developed in the Enerpac Hydraulic power pack.
It's an Enerpac BPE 14485 pump unit, with an Enerpac BVS 4 electrically operated change over valve. Pump will develop up to 10,000 PSI (yes TEN THOUSAND PSI not a typo!). The spool valve is operated by a remote pendant with an 'up' and a 'down' button. Both seem to work fine as I can hear the appropriate pilot valve click when the button is pressed.
When the Down button is operated, oil is fed to the top of the cylinder correctly, and if the press is squashing something pressure builds up and is held when the button is released - this is correct. However when the Up button is pressed it is supposed to release the pressure in the top of the cylinder and introduce oil into the bottom to raise the piston - this is not happening and the press continues to hold pressure for as long as you leave it, even without the pump.
I've been testing at 4000 psi to give my new seals a chance to bed in, and I've just had to release that pressure by cracking a fitting - wasn't too keen on that.
It all looks like the spool for the 'Up' isn't following the pilot but looking at it I'm not sure stripping it and rebuilding is in my competence. Hence seeking advice / contacts / sympathy / replacement.
Here are a few pictures and the details of the spool valve assembly:
It's an Enerpac BPE 14485 pump unit, with an Enerpac BVS 4 electrically operated change over valve. Pump will develop up to 10,000 PSI (yes TEN THOUSAND PSI not a typo!). The spool valve is operated by a remote pendant with an 'up' and a 'down' button. Both seem to work fine as I can hear the appropriate pilot valve click when the button is pressed.
When the Down button is operated, oil is fed to the top of the cylinder correctly, and if the press is squashing something pressure builds up and is held when the button is released - this is correct. However when the Up button is pressed it is supposed to release the pressure in the top of the cylinder and introduce oil into the bottom to raise the piston - this is not happening and the press continues to hold pressure for as long as you leave it, even without the pump.
I've been testing at 4000 psi to give my new seals a chance to bed in, and I've just had to release that pressure by cracking a fitting - wasn't too keen on that.
It all looks like the spool for the 'Up' isn't following the pilot but looking at it I'm not sure stripping it and rebuilding is in my competence. Hence seeking advice / contacts / sympathy / replacement.
Here are a few pictures and the details of the spool valve assembly: