TM-9-2350-311-10

HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A2, M109A3, M109A4 AND M109A5

TECHNICAL MANUAL; OPERATOR’S MANUAL

NOVEMBER 1994

TM-9-2350-311-10 - Page 499 of 775

3-7 FIRE CONTROL ALINEMENT TESTS AND MEASUREMENTS — CONTINUED

3-7.5

Leveling the Cannon Tube— Continued

TM 9-2350-311-10

a. Leveling the Cannon Tube Using the Cannon Tube Leveling Fixture (If Required) — Continued

5 Be sure cannon tube (2) is dry and clean. Insert the cannon tube leveling fixture (4) into muzzle brake

(12) end of the cannon tube to the point at which the magnet base stop (11) contacts the face of the

cannon tube. Be sure the magnet base stop is flush with the cannon tube.

6 Rotate the cannon tube leveling fixture (4) until the cross-level vial (9) bubble centers.

7 Place a pre-tested M1A1 gunner’s quadrant (13) set at 0 (with corrections applied if applicable) in the

groove (14) of the cannon tube leveling fixture (4) with LINE OF FIRE arrow (15) pointing to muzzle

brake (12) end.

3-95