At 9:00 a.m. on June 27th, Production and technology departments organized sales and after-sales service personnel to conduct knowledge training on the hoisting sheave in the heavy machinery plant. The company expert Mr. Mu gave a lecture, and he carried out the structure parameters of the hoisting sheave. Detailed introduction, combined with typical cases to explain the troubleshooting and precautions in after-sales service, and gave trainees many suggestions on communication skills. Through the training, the professional skills and technical service capabilities of the trainees have been improved.