求翻译：发动机工作时，必须保持正常油压。如果油压过低，各摩擦表面会因得不到足够的润滑而磨损加快；如果油压过高，容易使油封、油管压坏，消耗发动机动力。是什么意思？

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Engine work, it is necessary to maintain normal hydraulic. If hydraulic too low, the friction surface will be due to insufficient lubrication and hydraulic excessive wear, accelerate; if it is easy for the oil seals, oil pipeline broken engine power consumption.

When the engine works, must maintain the normal flowing tubing head pressure.If the flowing tubing head pressure excessively is low, each friction surface can because of not be able to obtain the enough lubrication to wear speeds up; If the flowing tubing head pressure excessively is high, easy to c

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