TM-9-2350-311-20-2
HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A2, M109A3, M109A4 AND M109A5
TECHNICAL MANUAL; UNIT MAINTENANCE MANUAL FOR CAB, ARMAMENT, SIGHTING AND FIRE CONTROL, ELEVATING AND TRAVERSING SYSTEMS AND ASSOCIATED COMPONENTS
DECEMBER 1993
TM-9-2350-311-20-2 - Page 90 of 828
TM 9–2350–311–20–2
2–29
Table 2-2.
PREVENTIVE MAINTENANCE CHECKS AND SERVICES FOR M109 SELF-
PROPELLED HOWITZER – CONTINUED
Location
Item
No.
Not Fully Mission
Capable if:
Procedure
Item to Check/Service
Interval
12
Annually
or 1500
Rounds
Torque Key
NOTE
•
Do not mix grease. If changing
between GMD and GAA wipe key
and keyway. Clean before using
new grease.
•
M185 cannon assembly has one
torque key keyway. M284 cannon
assembly has two keyways for
redesigned torque key.
Remove, measure, and lubricate torque
key (located at top of cannon tube in front
of exterior mount) (para 5–10). Measure
torque key in at least three places. If mea-
surement across torque key is less than
31/32 inch (24.6 mm) for M178 mount or
1–9/16 inches (3.97 cm) for M182 mount,
replace torque key. Grease that part of
torque key which fits in keyway with GMD
or GAA and reinstall.
M178 MOUNT CONFIGURATION
M182 MOUNT CONFIGURATION
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