There is an important correlation between quality and maintenance. Maintenance management has become the essential part of quality system. It is an investment rather than the cost. Improving the quality of maintenance will lead to improved efficiency and effectiveness. Maintaining perfect equipment means maintaining the perfect quality of products. It is the sixth pillar of TPM and aims to assure zero defect conditions. It is done by understanding and controlling the process intersections between manpower, material, machines and methods. It is executed by inspecting and monitoring conditions to eliminate variation. The key is to prevent defects from being produced in the first place, rather than installing rigorous inspection systems to detect the defect after it has been produced. It is aimed towards higher customer satisfaction or customer delight through highest quality achieved from defect free manufacturing.