TEST AND INSPECTION - Continued
M17/M18 or M17A1/M18A1 Quadrant and Cannon Tube Synchronization Procedure - Continued
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
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
Depress or elevate the cannon tube with the elevating handwheel until bubble (4) in fire control
quadrant level (2) centers.