M17/M18 or M17A1/M18A1 Quadrant and Cannon Tube Synchronization Procedure

TM 9-1240-375-34&P

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TEST AND INSPECTION - Continued

M17/M18 or M17A1/M18A1 Quadrant and Cannon Tube Synchronization Procedure - Continued

NOTE

M18/M18A1 quadrant is required for proper cannon tube synchronization.

Perform the following synchronization procedure whenever a cannon assembly or

tube is removed.

Before beginning synchronization procedure, cannon tube must be depressed to zero

mils and trunnions leveled (TM 9-1025-211-10/TM 9-1025-215-10).

Whenever the M17/M18 or M17A1/M18A1 quadrants are replaced, the following

synchronization procedure should be performed.

1 fc 2 6 6

NOTE

Before using cannon leveling pad (1), check for cleanness.

The fire control quadrant should be set on the higher cannon leveling pad when

leveling the cannon tube.

Test fire control quadrant (2) before using.

Place fire control quadrant (2) on cannon leveling pad (1) with LINE OF FIRE arrow (3) pointed toward

the muzzle.

Depress or elevate the cannon tube with the elevating handwheel until bubble (4) in fire control

quadrant level (2) centers.

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