(1) choose the type of gear oil according to the contact stress of tooth surface.

(2) choose the viscosity of the gear oil according to the speed of the gear line. Low viscosity oil with high speed. High viscosity oil with low speed.

(3) pay attention to the use of temperature. The oil temperature is high, the viscosity of the oil should be large, the viscosity of the oil is high in summer, and the viscosity is low in winter.

(4) pay attention to whether the gear lubrication and bearing lubrication are the same systems. They are rolling bearings or sliding bearings. Sliding bearings require low viscosity of lubricating oil.

Generally speaking, CKB gears, helical gears, bevel gears and low speed light load spiral gears can be selected with industrial antirust and industrial gear oils. CKC medium load gear oil is used for gears with 343-1079MPa stress and impact load. CKD heavy duty gear oil is used for gears whose stress is more than 1079MPa.