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 570 of 828

TM 9–2350–311–20–2

14–6

14–1 GUNNER’S ESCAPE HATCH (UNMODIFIED) — CONTINUED

d.

Installation

NOTE

Immediately prior to installation, apply primer to all contact surfaces, except threaded ones, as

shown in illustration.

1

Place gunner’s escape hatch (1) on new seal (24) in cab roof.

2

Place torsion bar anchor (6) in retainer weldment (7), if it has been removed.

3

Install retaining plate (10) and new retaining ring (9) on one end of torsion bar (5).

4

Install tube (8) over torsion bar (5) and then insert as an assembly through hinges of gunner’s escape hatch

(1) and roof, but do not engage splines on end of torsion bar with torsion bar anchor (6).

5

Install two machine screws (2) to fasten retaining plate (10) to gunner’s escape hatch (1).

6

Apply sealing compound (item 27, Appx D) to plug (3). Install flat washer (4) and plug. Torque plug to 50 lb–

ft (37 N

.

m).

1

9

10

2

5

8

7

4

3

6

1

24