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 547 of 828

TM 9–2350–311–20–2

Change 2

12–6.1

b.

Disassembly

NOTE

Perform step 1 for commander’s cupola with hook latch assembly or steps 1.1 through 1.3 for com-

mander’s cupola with knob latch assembly.

1

To disassemble cupola cover (1), remove spring pin (10), and straight pin (11). Discard spring pin.

1.1

To disassemble cupola cover (1), remove two cap screws (11.1), two lockwashers (11.2), catch (11.3), and

shims (11.4).

1.2

Remove two inserts (11.5) if necessary for replacement.

1.3

Remove decal (11.6) if necessary for replacement.

NOTE

Commander’s cupola containing drain holes will have a gasket to remove. Commander’s cupolas

without drain holes will have a cover seal to remove.

2

Strip off cover seal or gasket (12) and discard.

NOTE

Scrape dirt and adhesive from cover seal/gasket seat.

3

Lift off cupola cover (1).

NOTE

Step 4 pertains to cupola covers without outside latch handle.

4

Remove two machine bolts (13), two lockwashers (14), and cupola cover handle (15). Discard lockwashers.

13

12

10

11

1

14

15

11.1

11.2

11.4

11.5

11.6

1

11.3