1. Often add lubricating oil to the compressor, inhale it from the through hole next to the suction shut-off valve, add it from the refueling hole, and add it from the lower part of the crankcase. These three methods are more commonly used.After using it for a period of time, the user can press and hold the oil suction pipe with his finger to start the compressor to extract the air from the crankcase.

2. If the phenomenon of liquid strike is found, let the compressor continue to run for 2~3mm, so that the crankcase is in a vacuum state, and it will stop when the finger holding the nozzle feels a strong suction force.And pay attention to observe the oil surface indicator to see if the oil surface reaches the oil surface line.Open the suction and exhaust shut-off valves, and the refueling work is completed.