■Description

Cutting damage and spiral failure appear on the seal surface.

■Contributing factors

• The joint line of the seal is irregular, or the surface is not flat

• The seal is not lubricated properly during installation

• The groove is tight

• The seal is installed on the groove subject to parallel translation

• The seal of poor quality or low hardness

• The installation technique of the technician is poor

■Recommended improving method

• Correctly install, lubricate or design the seal

• Adopt the seal of good quality or higher hardness

• Enhance the training to the technicians