TM 9-2320-209-10-1 g. Earth Boring Machine and Polesetter Truck Controls and Indicators - Cont. 1. Leveling bubble. Shows that earth 4. Earth boring machine drive control auger is in straight up and down lever. Controls the turning of the position when bubble is centered. earth auger. Is used together with 2. Power-leveler shifting handle. Used the feed control lever. with boring machine feed and drive 5. Locking latch. Gives positive lock- control levers, to control up and ing of drive and feed control levers down and side to side movements of in braking position. earth boring machine and polesetter 6. derrick. Outrigger safety latch. Gives positive locking of outrigger leg 3. Earth boring machine feed control when in up position. lever. Controls up and down move- ment of earth auger, when used to- gether with the drive control lever. 4-22