TM 9-2320-361-34 15-35. EARTH BORING MACHINE REPLACEMENT (Contd) FOLLOW-ON TASKS: ● Install auger rack bar (para. 15-38). ● Install integral derrick (para. 15-36). ● Install hydraulic pump universal joints (TM 9-2320-361-20). ● Install earth boring machine seat and backrest (TM 9-2320-361-20). 15-125