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 87 of 828
TM 9–2350–311–20–2
2–26
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
6
Quarterly
Breech Operating Cam
Check and adjust (para 5–12).
7
Quarterly
Buffer Counter Recoil
Assembly
Prior to returning cannon tube to battery,
perform buffer inspection (para 5–17).
8
Quarterly
Breech Assembly
a. Breechblock: Check for cracks, ruined/
damaged locking threads and ease/
smoothness of operation.
b. Firing Block Assembly: Check for rust
deterioration of firing pin, and condi-
tion of firing block.
c. Obturator: Check for correct alinement
of front and rear split ring, corrosion/
deterioration/pitting of rings/assembly.
9
Annually
Contact Arm Assembly
and Cab Electrical Cable
and Brushes
Clean and adjust (para 9–3).
10
Annually
Main Accumulator
Perform zero pressure check (para 6–10).
11
Annually
Cab Traversing
Mechanism
Perform cab traverse check as follows:
(Chapter 11):
a. Position vehicle on level ground.
b. Press button (1) to release pin.
c. Release cannon travel lock (2) and
cab traverse lock (3).
1
3
2
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