求翻译：5.2.6.2先点动试泵，正常后开泵往油管内注油，这时先把主油管末端打开，让脏油排掉，为安全起间，把进入电磁给油器的管头打开，排除空气，放掉脏油，然后进行试运行。是什么意思？

5.2.6.2 first to move the test pump, oiling of the pump to the tubing normal after the opening, when the first end of the main pipeline opened to let dirty oil to drain for safety, into the electromagnetic open to the oil cooler tube head, excluding air, let go of dirty oil, and then proceed to a tr