What is the purpose of technical maintenance of mechanical equipment?

Originally, I was looking for the answer, but I saw that I was still studying this question, hehe ... I am also a technician. Personally, I think the main purpose of technical maintenance is: 1, anti-wear; 2. Effective treatment of some fault-prone parts can reduce the failure rate of equipment; 3. Effectively prolong the service life of the equipment; 4, improve the visibility of the enterprise as a whole. etc