03 - Manufactured from hot-rolled round steel of steel grade 45 according to GOST 2590-88. Heat treated. Often simply called an engine gear. The gear is mounted on the motor shaft, which is attached to the TSN.00.760 gearbox. It works in conjunction with the TSN.00.653 wheel. The gear has 3 versions with different internal diameters for different motors: 22 mm for AIR80V6 and AIR80V4, 24 mm for AIR90L4, 28 mm for AIR100S4 and AIR100L4.