TM-9-2350-311-10

HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A2, M109A3, M109A4 AND M109A5

TECHNICAL MANUAL; OPERATOR’S MANUAL

NOVEMBER 1994

TM-9-2350-311-10 - Page 460 of 775

TM 9-2350-311-10

3-6 ARMAMENT AND CAB MAINTENANCE - CONTINUED

3-6.7.1 Muzzle Brake and Bore Evacuator (11580776) - Continued

b. Installation

1

Before installing main reservoir (8) and preservoir (9) throughly clean and lubricate inside of main

reservoir and prereservoir. Clean unpainted tube surface (2), nine evacuator ball valves (11), 10

evacuator orifices (15) and three metering holes (16). Refer to Appendix G.

NOTE

The preservoir and main reservoir should be concentric with center of tube when installing to

prevent disengaging preformed packing from groove when sliding over threads. Apply a thick

coating of grease (item 18, Appx D) over threads to prevent damage to preformed packing

before installing reservoirs.

2

Install prereservoir (9) on cannon tube (2).

3

Using a sling and hoist, slide main reservoir (8) onto prereservoir (9).

4

Screw bore evacuator assembly thrust collar (4) back into position.

5

Install setscrew (3). Notify unit maintenance to torque setscrew 30-35 ft-lb (41-47 N•m)

6

Install thrust collar and muzzle brake (para 3-6.7).

3-58.2

Change 2