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Figure 6-5.Rear housing assembly and related parts (external view) - 14024_168
M61A1 GUN PRINCIPLES OF OPERATION - 14024_170

Aviation Ordinanceman 1 - Aviation theories and other practices
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Rotor assembly. The rotor assembly (fig. 6-4) is a major unit of the M61A1 gun. The front section or stub rotor supports the six barrels. The main body of the rotor assembly contains the rotor tracks, rotor drive gear, and the locking lugs to lock the barrels in place. The rotor tracks support the breech-bolt assemblies and provide a guide for the forward and backward movement of the bolt. There are six sets of rotor tracks attached to the ribs along the rotor body. Each set contains a front, center, and rear removable track. The removable track lets you install or remove a bolt assembly for servicing or replacement. The necessary front support for the rotor assembly consists of a double row of ball bearings. The rear is supported by needle bearings located inside the rotor body. The end plate provides the inner race for the needle bearings, and it also provides for the gun’s rear support. Rear housing assembly and associated parts. The rear housing assembly (figs. 6-5 and 6-6) is a major unit of the gun. It consists of an upper section and a lower section assembled as one unit. The rear housing assembly provides the main cam path that controls the movement of the breech-bolt assemblies. The elliptical (oval) shape of the main cam path causes the forward and backward movement of the bolt assemblies. The clearing-cam path is circular and located at the rear of the housing. It provides a path for the bolt assemblies during the gun’s clearing cycle. The housing cover, Figure 6-6.—Rear housing assembly and related parts (internal view). 6-5







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