Adjust the amount of oil supplied to the thread take up and needle bar crank 3 by turning adjust pin 4 调整挑线杆和针杆曲轴部3的油量时，转动油量调整销4进行调整。
2.
The minimum amount of oil is reached when marker dot a is brought close to needle bar crank 3 by turning the adjust pin in direction b 调详销刻点a从图的位置向b方向转动，转动到接近针杆曲轴3时，油量最小。
3.
The maximum amount of oil is reached when marker dot a is brought to the position just opposite from the needle bar crank 3 by turning the adjust pin in direction c 从图上所示的位置向c方向转动，当转到与针杆曲轴3的正对面的位置时，油量为最大。
