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 562 of 828
TM 9–2350–311–20–2
13–6
13–1 COMMANDER’S SEAT AND SUPPORT POST GROUP — CONTINUED
d.
Installation
1
Install seat carriage (8) on seat support (4). Seat carriage will slide down seat support when manual control
handle (16) is pulled toward you.
2
Install two angle brackets (15) at top of seat support (4) using one cap screw (14), flat washer (13), new
lockwasher (12), and hex nut (11).
3
Install seat (9) and backrest (10) (assembled) on seat carriage (8) using headless shoulder pin (7) and per-
manent washer (6).
4
Attach commander’s seat assembly (5) to cab using four flat washers (3), four new lockwashers (2), and
four cap screws (1) on either end of seat support (4).
e.
Adjustment
Height of seat (9) and backrest (10) can be adjusted by moving seat carriage (8) up and down seat support
(4). To move seat and backrest vertically, pull manual control handle (16) toward you. When seat and back-
rest are at desired height, release manual control handle.
5
10
8
4
1
2
13
12
11
7
6
16
1
3
3
15
14
2
9
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