TM-9-1240-401-34&P Technical Manual for M109 Telescopes and Mounts Download
Page 171 of 344
NOTE The reading on the azimuth counter of the M117/M117A2 panoramic telescope must agree with the toler- ances given below. CANT ADJUSTMENT Quadrant seat Cant Azimuth Tolerance elevation angle corrections (mils) (mils) (mils) (mils) 88.9 27.0 ±1.3 88.9 59.6 ±0.7 88.9 108.8 ±1.5 1200 88.9 216.8 ±1.8 177.8 54.5 ±0.6 177.8 120.3 ±1.0 1100 177.8 342.4 ±2.0 h. PITCH LEVEL VIAL ADJUSTMENT 1 Install perpendicularity gage (1) or two parallel bars on M145/M145A1 telescope mount (2). 2 Level the cross-leveling fixture (3) in elevation and cross-level. 3 Set the zeroed M1A1 gunner’s quadrant (4) on the perpendicularity gage (1) or two parallel bars. 4 Adjust pitch knob (5) until M1A1 gunner’s quadrant (4) level (6) is centered. 5 Adjust elevation handwheel until elevation counter (7) reads zero. 4-57