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 280 of 828

TM 9--2350--311--20--2

5--24

5--9

CARRIER ASSEMBLY — CONTINUED

b. Disassembly — Continued

16

Remove rack plate (38), gear rack (39), and stop (40) that restrains helical compression springs (41 and

42).

WARNING

Stop and detent plunger hold compressed springs. Use care during disassembly to avoid possible

injury.

17

Remove spring pin (43) while restraining detent plunger (44) and helical compression spring (45). Discard

spring pin.

18

Remove detent plunger (44) and helical compression spring (45).

c. Inspection

NOTE

If any of the parts below are unserviceable, replace as required.

1

Inspect springs (41 and 42) for cracks and distortion.

2

Inspect operating crank assembly (3) for visible cracks.

3

Inspect carrier assembly (4) for cracks and distortion.

4

Place machinist’s rule on cut-away end of detent plunger (44) and measure for excess wear. Replace if

detent plunger measures less than 31/32 inch (24.6 mm) at any point.

d. Assembly

WARNING

Detent plunger and stop hold compressed springs. Use care during assembly to avoid possible in-

jury.

1

Install helical compression spring (45), detent plunger (44), and new spring pin (43) in carrier assembly (4).

2

Lubricate helical compression springs (41 and 42) with GAA and install in gear rack (39). Install gear rack,

stop (40), and rack plate (38).