Always keep the oil level of the pump within the oil limit range shown on the oil level gauge
during operation. If the amount of oil is incorrect, the performance of the pump will deteriorate
resulting in the malfunctioning of the pump. When the amount of oil has reduced and the oil
level has reached an area below the lower red line which shows the lower limit on the oil level
gauge such that the level cannot be seen, the ultimate pressure increases and exhausting sound
may not cease.