TM-9-1240-401-34-P
TELESCOPE MOUNT M146: M118A2 AND M118A3; TELESCOPE MOUNT M145: M145A1; PANORAMIC TELESCOPE: M117 AND M117A2; FIRE CONTROL QUADRANT: M15; PERISCOPE: M42
TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE MANUAL
JULY 1993
TM-9-1240-401-34-P - Page 171 of 590
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
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