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 151 of 775
TM 9--2350--311--10
Change 6
2--59/(2--60 blank)
Table 2--1. PREVENTIVE MAINTENANCE CHECKS AND SERVICES
FOR M109 SELF-PROPELLED HOWITZER — CONTINUED
Location
Item
No.
Not Fully Mission
Capable If:
Crewmember
Procedure
Item to Check/
Service
Interval
39
After
Bore
Evacuator
CHIEF OF SECTION
NOTE
•
Some rotation of the bore evacuator is
acceptable. However, if it rotates more than 1
inch (2.54 cm), check to ensure setscrew
locks bearing ball. Notify unit maintenance if
problem persists.
•
Do not fill metering holes with grease. Filling of
the holes will decrease efficiency of the bore
evacuator.
Clean evacuation orifices and ensure that bottom
setscrew (not shown) is staked.
Staked setscrew,
ball or spring is
missing.
Inspect valve ring (1) for cracks or deformation.
Valve ring (1) is
broken.
Clean cannon tube (2) threads.
NOTE
Notify unit maintenance if valve ring is cracked or
deformed, or if threads are burred or damaged.
After firing, remove setscrew (3) from bore evacua-
tor (4). Insert T-handle into setscrew hole. Turn T-
handle to engage with threads. Continue turning to
depress bearing ball and spring (not shown). Insert
pry bar into hole (5). With bearing ball (not shown)
depressed, unscrew bore evacuator and slide it
forward. Slide valve ring (1) forward and 10 check
balls (6) should fall out. Thoroughly clean check
balls and three metering holes (7). Apply a light
coat of grease (item 19, Appx D) or grease (item
18, Appx D) to bearing balls, valve ring, and un-
painted cannon tube surfaces before reassembling.
Three or more
check balls are
missing.
4
2
5
3
1
6
7
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