TM 9-2320-209-34-2-2 b. Removal. CAUTION Do not let derrick down lower than horizontal position. If derrick is lowered any further, wormgear (3) will run off worm leveling gear (4) and derrick will fall. When derrick is horizontal, only two teeth on worm leveling gear (4) will mate with worm gear (3). NOTE Before placing derrick (1) in horizontal position, be sure there is enough room to take off derrick (1). Make sure there is enough room to feed rack bar (5) halfway out of derrick. You will need at least six feet to the left and 20 feet to the right. 1. Using boring machine, place derrick (1) in position as shown. Refer to Raising, Leveling, and Lowering the Derrick Tube, TM 9-2320-209-10. 2. Using ratchet wrench, turn horizontal leveling worm assembly (2) until derrick is horizontal. Refer to Raising, Leveling, and Lowering the Derrick Tube, TM 9-2320-209-10. Be careful not to let wormgear (3) run off worm wheel leveling gear (4). GO TO FRAME 2 17-709