在通电前应检查液位和油位是否按要求加注至正常位置；
Before switching on the power, inspect if the liquid and oil level are filled to the normal level as required;
LM500系列维持发动机曲轴箱，压缩机或泵的油位，油位过低时自动调整补充油位到机器正常运转需要的油位。
The LM500 series maintains the crankcase oil level of an engine, pump or compressor. Adjusted to the correct running-oil-level, it will replenish oil as it is used.
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