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Under normal feed size and material hardness, the service life of Mn13Cr2 high-manganese steel jaw plates is typically 3-6 months, depending on material hardness, feed size, throughput and tooth profile design. Turning the plates over periodically can extend life by about 20%.

When the jaw plate teeth show uneven wear or severe local wear, stop the machine and check whether the feed size is uniform and whether material is fed to the center of the crushing chamber. If wear exceeds half but has not reached the scrap limit, swap the fixed and moving jaw plates or turn them over.

Main causes include bolts not tightened diagonally in sequence to the specified torque during installation, gaps between the jaw plate and jaw body, and impact overload from oversized feed material. Regularly re-tighten bolts, check mating surfaces, and prefer high-strength bolts of grade 8.8 or above when replacing.