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 558 of 828

TM 9–2350–311–20–2

13–2

13–1 COMMANDER’S SEAT AND SUPPORT POST GROUP

This task covers:

a.

Removal

b.

Disassembly

c.

Assembly

d.

Installation

e.

Adjustment

INITIAL SETUP

Tools

Artillery and turret mechanic’s tool kit

(SC 5180–95–CL–A12)

Materials/Parts

Lockwasher (item 84, Appx G)

Lockwashers (4) (item 79, Appx G)

Lockwashers (4) (item 81, Appx G)

a.

Removal

NOTE

Except for adjusting the seat, perform the procedures in this paragraph only if the entire seat needs

repair.

1

Remove four cap screws (1) four lockwashers (2), and four flat washers (3) from top and bottom of seat sup-

port (4). Entire commander’s seat assembly (5) will now come off. Discard lockwashers.

2

Remove permanent washer (6) and headless shoulder pin (7) from seat carriage (8). This will release seat

(9) and backrest (10) (assembled).

3

Remove hex nut (11), lockwasher (12), flat washer (13), cap screw (14), and two angle brackets (15). Dis-

card lockwasher.

4

Pull manual control handle (16) toward you and slide seat carriage (8) upward to remove from seat support

(4).