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Figure 6-9.Breech-bolt assembly in firing cycle
AMMUNITION HANDLING AND GUN DRIVE SYSTEMS - 14313_146

Aviation Ordinanceman - Aviation theories and other practices
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A10. You should use DOD-L-85336 lubricant for the M61A1 gun. The breech-bolt assembly has now completed a full firing cycle through the elliptical-shaped main cam path. It has performed seven actions or operations in the following sequence: 1. Feed 2. Chamber 3. Lock 4. Fire 5. Unlock 6. Extract 7. Eject All  six  breech-bolt  assemblies  repeat  this  firing cycle until the clearing solenoid is actuated, and the gun starts the clearing cycle. Clearing Cycle The    clearing    cycle    starts    when    the    clearing solenoid is energized. The clearing solenoid depresses the clearing sector arm to the gun housing. This places the clearing sector arm in a ready position. The first bolt assembly   that   passes   the   sector   arm   triggers   the actuating  pin  that  lets  the  sector  arm  continue  to  the clearing  mode  position.  This  diverts  the  succeeding bolt assemblies into the clearing cam path (fig. 6-11). 6-9 Figure 6-10.—Ejection of empty case. Figure 6-11.—Breech-bolt assembly in clearing cycle.







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