TM 9-2320-209-34-2-2 FRAME 2 CAUTION Do not feed rack bar (1) more than six feet from bottom of boring case (3) while in horizontal position. Weight of rack bar may cause damage to pinions in boring gearcase (3). 1. Feed rack bar (1) halfway out of derrick assembly (2) as shown. Rack bar should stick out five feet. Refer to Raising, Leveling, and Lowering the Derrick Tube, TM 9-2320-209-10. 2. Turn off engine. GO TO FRAME 3 17-710