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 678 of 828

TM 9–2350–311–20–2

18–10

Change 2

18–3 M145/M145A1 TELESCOPE MOUNT — CONTINUED

c.

Disassembly of Linkage Assembly

1

Remove four cap screws (4) and four lockwashers (11) from arm (12). Discard lockwashers.

2

Remove plate (13), plate (14), and two gripspring sets (15) (four gripsprings).

3

Remove two self-locking nuts (16) from shouldered shaft (17). Using brass drift punch and hammer, tap

shouldered shaft from arm (12). Discard self-locking nuts.

4

Separate arm (12) from link (18) and remove two gripspring sets (19) (four gripsprings), and two washer

bearings (20).

5

At bottom of link (18), remove cap screw (21) and lockwasher (22). Discard lockwasher.

d.

Inspection of Linkage Assembly

1

Inspect gripsprings (15 and 19) for evidence of spinning. Replace if defective.

2

If plate (13) shows evidence of being dented or bent, replace.

3

Inspect all threaded parts for stripped or missing threads. Replace as needed.

e.

Assembly of Linkage Assembly

1

Install two washer bearings (20) with the raised portion against ball bearing (23).

2

Install bottom link (18) into arm (12).

3

Insert shouldered shaft (17) into arm (12), and tap into place using brass drift punch and hammer.

4

Install two gripspring sets (19) with the flat sides of the external springs positioned against washer bearings

(20) and internal springs towards self-locking nut. Install two new self-locking nuts (16).

5

Install new lockwasher (22) and cap screw (21) at bottom of link (18).

6

Install two gripspring sets (15) in arm (12) with the flat sides of the external halves together.

7

Place plate (13) on arm (12) and plate (14) on the opposite side of arm.

8

Install four new lockwashers (11) and four cap screws (4).