... Key words: gearbox, ZLYJ series, speed reducer, extruder gearbox, plastic gearbox, plastic extruder gearbox, plastic extrusion machine gearbox, hard tooth gearbox, gearbox for plastic extruder, gearbox for plastic extrusion ... ratio and assemblage mode respectivelyExample of earmark: ZLYJ 225-- 12.5 -- (,)ZLYJ series 133, 146, 173, 200, 225, 250, 280, 315, 330 are ...