Maintenance plays a significant role in the modern manufacturing system, it is to keep and preserve machines, equipment, and facilities in a normal condition. Good maintenance work can make the company have the ability to minimize downtime, improve product quality, and reduce production costs. Meanwhile, maintenance activity is a high risk work, because maintenance work always carried out in an environment that maintenance operator will face different kinds of hazards, and compare to other areas in the industry, maintenance doesn't a high automation level work, so safety is a critical issue during maintenance work. This thesis analyzes the safety problems and risks during maintenance work.