TM 9-1240-400-34&P
5-19.
FINAL INSPECTION INSTRUCTIONS (CONT)
CHECKING AND ADJUSTING ELEVATION KNOB TORQUE AND BACKLASH (CONT)
4
Place gunner's quadrant (4), on parallel bar (5) with
end-for-end correction applied, on upper assembly
(6). Rotate gunner's quadrant knob (7) to center
bubble of level vial (8). Record reading of gunner's
quadrant (4).
5
Continue rotation of elevation knob (1) in the same
direction for at least one-half turn, reverse direction
and continue back to the intersection of the two
scribed lines (9) with no over-travel. Check to see if
bubble of level vial (8) of gunner's quadrant (4) is
centered. If not, rotate gunner's quadrant knob (7) of
gunner's quadrant (4) to center bubble of level vial
(8). Backlash shall not exceed 0.5 mil as read from
gunner's quadrant (4).
6
Adjust elevation machine thread plug (10) using a
screwdriver. Check the torque or backlash and if still
excessive, proceed to step 7.
5-60
