Mechanical seal assembly: in the moving and static ring mirror coated with a layer of clean 20 lubricating oil; Guide bearing seat with lubricating oil, the static ring gently positioned into the guide bearing seat; Then grease the pump shaft, gently load the moving ring part of the mechanical seal into the pump shaft, and gently push the seal ring should be able to retract freely (pay attention to the anti-rotation parts of the moving and static ring parts need to be assembled in place).