C6, TM 9-2350-230-12
Table 13-1. Major Groups and Assemblies - M73E1 (Fig. 13-1) - Continued
ASSEMBLY OR GROUP
DESCRIPTION
Back plate assembly,
(Items 7 through 10)
helical (driving)
Helical (driving) springs are located at rear of the barrel extension
springs and guide
assembly. They are retained in position by the guide rods, which
rod group
are secured to the back plate. They help absorb recoil shock and provide the energy to
feed, strip, chamber, and fire the following round. The back plate assembly is located at
the rear portion of the receiver assembly. It houses the trigger sear and solenoid. The
trigger safety is located at the top of the back plate. It acts as a positive sear block for
manual operation of the trigger and when the weapon is operated by the solenoid. It
contains a nut shield covering the nuts securing solenoid to back plate.
Barrel extension
(Items 11 through 13)
group
The action group of the weapon. Composed of the breechblock assembly and barrel
extension assembly. This group chambers and fires the cartridge, locks and unlocks the
breech, and extracts and ejects the spent cartridge cases.
Charger group
(Items 14 through 17)
Composed of a retaining ring and charger assembly. The retaining ring secures the
charger assembly to the receiver. The charger assembly may be assembled on the right
or left side of the receiver by repositioning the slide connector, buffer pivot pin, and
charger mounting stud. The charger is utilized to manually charge the weapon (before
loading), loading the first round, and to recharge the weapon in case of a malfunction or
stoppage.
Receiver assembly
(Item 18)
Serves as a support for all major assemblies and groups. It houses the action of the
weapon and, through a series of cam ways, controls the functioning of the barrel
extension assembly and breechblock assembly.
NOTE
The serial number is located on the left side of the receiver.
Section 13-2. OPERATING INSTRUCTIONS
7.62MM coaxial machine gun as well as the 152MM
13-4. Service Upon Receipt of Materiel
Refer to
hider
b. Controls. For description, illustration and function of
controls refer to table 13-2.
13-5. Instruments and Controls a. Instruments Ml119
telescope and XM44E1 periscope are used for aiming
13-6. Operation
the
For preparation, loading and firing pro cedures refer to
13-2