Swing Gearbox, Reduction 9148921 for John Deere Excavator 110 120. Swing Motor and Gear Box. For John Deere Excavator 110 120. Feedback & Customer Services. If you need to change it, please leave me a message. All of our items come with a. If you need to return, please check twice to confirm the item not work and contact our customer service representative, let us know the detailed problem and send us some pictures for confirmation. Our office hours are every day except Sunday, but the processing time is uncertain, we will process your problem on the same day. And our office is closed on Sunday and we apologize for the late reply during the holidays. If you are not satisfied in anyway, pl.