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 258 of 828

TM 9–2350–311–20–2

5–2

Change 2

5–1

THRUST COLLAR, BORE EVACUATOR 11578384, AND BORE EVACUATOR THRUST

COLLARS

This task covers:

a.

Disassembly

b.

Inspection

c.

Assembly

INITIAL SETUP

Tools

Artillery and turret mechanic’s tool kit

(SC 5180–95–CL–A12)

Equipment Condition

Muzzle brake removed (TM 9–2350–311–10)

Thrust collar removed (TM 9–2350–311–10)

Bore evacuator removed (TM 9–2350–311–10)

References

TM 9–2350–311–10

a.

Disassembly

NOTE

Setscrews for both thrust collars are staked in three places on the side with spring and detent ball

only.

1

Remove setscrew (1), spring (2), and bearing ball (3) from thrust collar (4).

2

Remove setscrew (5), spring (6), and bearing ball (7) from bore evacuator (8).

3

Remove setscrew (9), spring (10), and detent ball (11) from bore evacuator assembly thrust collar (12).

b.

Inspection

1

Inspect bore evacuator (8) for cracks. Replace if cracked.

2

Inspect muzzle brake (13) for cracks. Replace if cracks exceed 1 inch (2.54 cm).

c.

Assembly

1

Install detent ball (11), spring (10), and setscrew (9) in bore evacuator assembly thrust collar (12). Stake set-

screw in three places.

2

Install bearing ball (7), spring (6), and setscrew (5) in bore evacuator (8). Stake setscrew in three places.

3

Install bearing ball (3), spring (2), and setscrew (1) in thrust collar (4). Stake setscrew in three places.

8

7

6

5

4

3

2

1

13

9

10

11

12