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Hydra-Mac Hydrostatic Charge Oil Pressure Questions
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<blockquote data-quote="Tazza" data-source="post: 17152" data-attributes="member: 82"><p>Totally normal for your charge pressure to drop off when you are working it, but usually it goes to say 90psi. Charge pressure is used to replace *wasted* oil in your hydrostatic system. Your pumps and motors have internal leakage that when under load will leak more, this oil will pass back through the oil cooler and back to the tank, fresh cool oil is drawn back into the system to help keep things cool. As the oil warms up it thins out, thinner oil passes through the gaps in the pumps and motors easier so your pressure will drop quicker when warm. From memory, your hydraulics are happy to run till they get to around 100C, i think my temp switch turns on at about 120C</p><p>You seem to know your stuff after adding an external relief, you sure have done your home work!.</p><p>Back to charge pressure, on Bobcat machines you can lift the arms up and drive around, when the charge pressure falls, lower the arms quickly and your charge pressure should come back up. I don't know if thats just because of the hydraulic circuitry bobcat uses or if they are all setup the same.</p><p>I hope some of that made sense.</p></blockquote><p></p>
[QUOTE="Tazza, post: 17152, member: 82"] Totally normal for your charge pressure to drop off when you are working it, but usually it goes to say 90psi. Charge pressure is used to replace *wasted* oil in your hydrostatic system. Your pumps and motors have internal leakage that when under load will leak more, this oil will pass back through the oil cooler and back to the tank, fresh cool oil is drawn back into the system to help keep things cool. As the oil warms up it thins out, thinner oil passes through the gaps in the pumps and motors easier so your pressure will drop quicker when warm. From memory, your hydraulics are happy to run till they get to around 100C, i think my temp switch turns on at about 120C You seem to know your stuff after adding an external relief, you sure have done your home work!. Back to charge pressure, on Bobcat machines you can lift the arms up and drive around, when the charge pressure falls, lower the arms quickly and your charge pressure should come back up. I don't know if thats just because of the hydraulic circuitry bobcat uses or if they are all setup the same. I hope some of that made sense. [/QUOTE]
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Hydra-Mac Hydrostatic Charge Oil Pressure Questions
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