TM 5-3805-280-10 Operator’s Station ROCK DRILL START—STOP SELECTION CONTROL BOX (MODEL 230LCRD) Set the selector switch (B) to the B position for normal excavator operation. Set the selector switch (B) to the A position to activate the electrical and hydraulic circuits for the rock drill. When set to the A position, all pilot hydraulics for the excavator are neutralized. T125072 –UN–28OCT99 A—Rock Drill Start—Stop Selection Control Box B—Selector Switch CED,OUOEBAS,1 –19–19JAN00–1/1 2-25