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  1. Kdowney50

    Bliss Model 18 Punch Press

    I am in charge of maintenance & repair for a small manufacturing plant that uses several Bliss Model 18 Punch Presses. I know they are old and obsolete. However, they still stamp out parts day after day, so replacing them is a hard sell. I wonder if there is anyone out there that still uses...
  2. Kdowney50

    Lack of pressure in Hydraulic Power Unit

    Good info. I have used your e-book a lot on this project. There is a lot of good info in there. I have found it most useful. I especially like the way you break down the symbols to show how they work in a circuit. Placing them next to a cut-away of the actual component is probably the best part...
  3. Kdowney50

    Lack of pressure in Hydraulic Power Unit

    Yes, thats how its hooked up. I thought it was strange too. However, I have two other Vickers Power Units, smaller, but of exactly the same design. The Relief valve on the left of the schematic is indeed a CT-06-B10 (500-2000lb) Pilot Operated. I may be using the wrong symbol. I will try...
  4. Kdowney50

    Lack of pressure in Hydraulic Power Unit

    I agree that "flow is bypassing somewhere". I may be able to observe the returns to tank with an inspection mirror. I have a stethoscope and will give it a try. As for the directional valve being mis-adjusted . . .you may have something there. However, Ram speed appears normal up to platen...
  5. Kdowney50

    Lack of pressure in Hydraulic Power Unit

    Sorry. I found more errors in my drawing. This "should" be the correct schematic. http://files.engineering.com/getfile.aspx?folder=a1bb2009-b3cf-47ad-b7c7-edd78937646d&file=Hydraulic_Schematic.xls
  6. Kdowney50

    Lack of pressure in Hydraulic Power Unit

    I found an error in my attached schematic. Here is the corrected schematic.http://files.engineering.com/getfile.aspx?folder=e847005f-7644-4a03-870b-37905daf99dc&file=Hydraulic_Schematic.xls
  7. Kdowney50

    Lack of pressure in Hydraulic Power Unit

    To answer your questions: I have a ram, not a double acting cylinder. The weight of the platens drives the ram down. The system develops enough pressure (flow?) to extend the ram and close the platens. Therefor, the pumps are priming. The directional valve is manual. I can extend and retract the...
  8. Kdowney50

    Lack of pressure in Hydraulic Power Unit

    I have an old Vickers Dual Pump Power unit I'm using to pressurize the vertical ram of a laminating press. It has worked well for years (20+) but will no longer build up pressure when the Remote Control Pressure Relief Valve (C175) is cranked in. Some details: This is a dual pump unit. It has...

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