Healthy hydraulic presses run cool, have no leaks and get up to pressure quickly, according to advice offered by representatives from press builder Greenerd Press Machine Co., Inc., Nashua, NH. For example, it's a good sign if it takes V2 to 1 sec. to build up the maximum required pressure, and if it takes more than 2 to 3 sec., you're likely looking at a problem with the pump, relief valve or motor. Preventive-maintenance features, as well as remote diagnostics, scored high on the checklist designed for hydraulic-press users provided by officials from another press builder, Neff Press, St. Louis, MO. They often recommend that metalformers outfit hydraulic presses with sensors that can warn of tool wear, or trigger other preventive-maintenance tasks. For example, sensors can measure draw tonnage at a particular stroke length, and if tonnage readings exceed what's expected, tools may need sharpening.
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