C12, TM 9-2350-230-12
TABLE 8-17.1. PREVENTIVE MAINTENANCE CHECKS AND SERVICES-
PRIMARY ARMAMENT AND RELATED EQUIPMENT - CONTINUED
INTERVAL
COMPONENT
PROCEDURE
REFERENCE
Every 30
152MM
a. Assure recoil mechanism is pressurized, and
days when
gun
safe to fire indicator is in SAFE position.
not firing
launcher
recoil
b. Assure turret travel lock is engaged.
mechanism
c.
Using exercising bracket on wrecker boom,
position wrecker and M551 vehicle to assure
wrecker boom and gun launcher tube are on
the same plane and square with each other.
NOTE: It may be necessary to position rear
of the M551 on an incline and elevate cannon to
assure plane alignment, i.e., straight line of
wrecker boom and gun launcher:
d. Mark a chalk line on the gun launcher tube (or
bore evacuator if 81 MQD) 6 to 8 inches forward
of dust cover.
e. Extend boom of wrecker until wood block of
exercising bracket contacts gun launcher
muzzle.
CAUTION: Assure precise alignment of gun
launcher and wrecker boom to prevent component
damage.
f.
Extend wrecker boom until gun launcher has
been moved out of battery 6 to 8 inches (chalk
line) then retreat boom.
g. Repeat operation at least 10 times to insure
that recoil sliding areas and seals are lubri-
cated.
h. Leave recoil mechanism in normal precharged
pressure condition.
8-87