Made of grey cast iron according to GOST 1412-85 by casting and turning. Often simply called a large pulley. The gear is mounted on the motor shaft, which is attached to the TSN.02.020 gearbox. It works in conjunction with the TSN.00.124 pulley. The pulley has 2 versions with different internal diameters for different motors: 32 mm for AIR112MB6 and 38 mm for AIR132S6.