What is the correct position for the oil level in a gear reducer?

[BellaRose]

The correct oil level position for a gear reducer is at the midpoint between the upper and lower limits, approximately two-thirds of the oil sight glass position. Below are relevant details: Gear Reducer: For standard manufacturer-produced gear reducers, the oil sight glass should be a transparent window allowing observation of the oil inside the housing. Reducer: It is an independent component consisting of enclosed gear transmission, worm drive, or gear-worm transmission within a rigid housing. Commonly used as a speed reduction transmission device between the prime mover and working machinery, it serves to match rotational speeds and transmit torque between the prime mover and working machinery or actuators, with extremely widespread applications in modern machinery.