550/43168 JCB Excavator Swing Reducer Planetary Carrier Assembly The 550/43168 swing reducer planetary carrier assembly is a replacement component for compatible JCB excavator swing reduction gearbox systems. The planetary carrier supports the planetary gear arrangement within the reducer and helps transmit torque through the gear reduction mechanism. Product Overview This product is listed as a swing reducer planetary carrier assembly for JCB JS200, JS205, JS210, JS220 and