... efficiency.8. The imported precise and durable bearing and framework oil seal assure the liability of rotary precision and airproof, no ... rate of troubles is greatly reduced.9. The patented dense oil lubricated pump is set on the back, realizing automatic lubricant feeding ... .S. technology drive system, U.S. TWB bearing, fluorine rubber oil seals, U.S. JESON belt, high quality motor, achieve the ...