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 122 of 775

TM 9-2350-311-10

Interval

Before

Table 2-1. PREVENTIVE MAINTENANCE CHECKS AND SERVICES

FOR M109 SELF-PROPELLED HOWITZER — CONTINUED

Location

Item to Check/

Service

Breechblock

Crewmember

Procedure

CANNONEER NO. 1

•

•

Never forget to put operating handle back to

stow position. If left down while closing

breechblock, it can cause serious injury to per-

sonnel. Make it a practice never to let go of

handle until you return it to stowed position.

If breechblock is not closed completely, do not

attempt firing, as it may result in death or inju-

ry to crew.

To prevent damage to follower assembly, firing

mechanism must be in firing position before

breechblock is opened manually.

a. Before firing, open and close breechblock (1) to

be sure it operates freely and smoothly and wit-

ness marks (2) aline. If breechblock or breech

ring threads (3) are burred and prevent smooth

operation, notify unit maintenance.

Not Fully Mission

Capable If:

Breechblock (1)

will not close

completely (wit-

ness marks (2)

on breech ring

(4) do not aline

with witness

marks on breech-

block). Operating

handle (5) does

not work or

breech mecha-

nism is seized.

2-36