1, the required tools: when taking off the old packing and replacing the new packing, special tools are needed, and the clamp nut is pre-tightened with the fastener. In addition, regular use of standard safety facilities and compliance with relevant safety regulations are required. Before installation, you must first familiarize yourself with the following equipment: cutting machine for verifying disc ring, verifying torque wrench or wrench, safety hat, internal and external calipers, lubricants for fasteners, reflectors, disc extractors, tools for cutting graphite disc, vernier calipers, etc.