TM-9-1240-400-34-P
TELESCOPE; PANORAMIC: M115, ELBOW: M139, MOUNT: M138 AND M137
TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE MANUAL
OCTOBER 1993
TM-9-1240-400-34-P - Page 21 of 344
TM 9-1240-400-34&P
ITEM
ITEM T0
NO.
BE INSPECTED
PROCEDURE
16
Reset Counter
(1) Rotate knob while observing reset counter.
Reset counter must be resettable to 3200 mils from
any counter position.
(2) Rotate deflection knob while observing counter.
Counter indication must increase when deflection
knob is rotated clockwise, and decrease when
rotated counterclockwise.
17
Counter Setting
Set -50 mils (right) into gunner’s aid counter and
observe that reset counter increases by 50 mils Set
+50 mils (left) into gunner’s aid counter and observe
that reset counter decreases by 50 mils Deflection
counter must not change during either of preceding
actions.
18
Counter Numerals
Rotate direct-indirect knob, elevation knob, reset
counter knob, and gunner’s aid knob in turn to
lowest digit.
Be sure lowest digit of each counter is
in coincidence with its respective index line and
remaining numbers are in alinement within 1/16 in.
(1.6
mm).
19
Rotating Head Assembly
Rotate deflection knob while observing motion of
rotating head.
Rotating head must move in continu-
ous motion without binding or jumping.
20
Elbow Assembly
Must rotate left and right through its intended dis-
tance, and hold in established position.
2-5
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