. OPERATION DETAILED CONTROLS AND GAUGES (3) is used to operate the arm 3 - 41 Work Equipment Control Lever Left work e quipmen and upper structure control lever Arm operation (a) A rm OU (b) A Swin g operation (c) S wing to righ (d) S wing t N (Neutral) : The upper structure and a rm are held in position and do not move. Righ t work equipment contro l lever (4) i s used to operate the boom and bucket Boo m operation (a) R AISE (b) L OWER Buck et operation (c) D UMP URL (d) C N (Neutral) : The boom and bucket are held in position and do not move.