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 41 of 828
TM 9–2350–311–20–2
1–10
1–14 LOCATION AND DESCRIPTION OF MAJOR COMPONENTS — CONTINUED
1–14.1 Location and Description of Major Internal Components — Continued
f.
Cab Ammo Rack. The cab ammo rack (7) allows easy access to 22 rounds of 155mm projectiles. Quick-release retainer
assemblies hold projectiles.
g.
Power Pack Assembly. The power pack assembly (8) features an electrically driven hydraulic pump, a hydraulic fluid
reservoir, and a sight gage assembly for easy hydraulic fluid level checks. The M109A2/M109A3 howitzers filter fluid
using a strainer and filter. The M109A4/M109A5 howitzers hydraulically filter fluid using two external filters (9) and filter
air and water from the hydraulic system using air line filter and hydroscopic breather (10).
h.
Commander’s Cupola. The commander’s cupola (11) serves as mount and support for M2 machine gun, holds M27
periscope, and traverses 6400 mils.
RIGHT REAR
CAB INTERIOR
8
7
11
9
10
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