Embedded modules feature sealed cavities, leading many to believe their grease requires no replacement for life. Yet grease deteriorates under high temperature, shear force and oxidation, losing load-bearing and sealing performance. Simply adding new grease without removing degraded grease will accelerate failure. Complete grease replacement restores a uniform and reliable lubrication environment, a key point overlooked in most maintenance plans.
- A major misconception is equating sealed design with maintenance-free use. While the cavity blocks external contaminants, long-term micro-movement and frequent swing cause grease consistency reduction and base oil separation due to mechanical shear and oxidation.
- Grease inside sealed cavities deteriorates no slower than in open environments. Heat buildup, trapped metal debris and fine dust from slight seal wear speed up grease deterioration and separation.
- Regular complete grease removal aims to eliminate hardened soap base, sludge and abrasive particles. Residues will act as grinding paste and aggravate wear on guide rails and lead screws.
- Only refilling grease without thorough cleaning contaminates new grease quickly, greatly shortening its service life. Complete grease replacement is the core of maintenance.
- Grease replacement cycles shall be determined by actual grease separation rate and acid value, rather than sealing structure. The claim of lifelong maintenance-free lubrication for sealed modules is unreliable in industrial applications.
Sealed structures offer protection but do not eliminate maintenance needs. Following grease aging rules and implementing regular full grease replacement can maximize the service life of embedded modules and prevent failures caused by poor lubrication.