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 343 of 828

TM 9–2350–311–20–2

6–27

d.

Testing

1

Loosen two hex nuts (7) at ports M–1 and M–2. Drain fluids from manual elevation tubes (8) into utility pail.

2

Remove accumulator cap (9) and air valve cap (10) from accumulator (3).

NOTE

Each check with tire pressure gage will deplete pressure by approximately 20 psi (137.90 kPa).

3

Use tire pressure gage to check nitrogen pressure at valve (11).

NOTE

If precharged pressure is below 75 psi (517 kPa), charge the accumulator (para 19–3).

4

Tighten two hex nuts (7) to secure manual elevation tubes (8).

5

Install air valve cap (10) and accumulator cap (9) on accumulator (3).

6

Rotate manual elevation hand pump handle (12) counterclockwise. Rotate until movement is detected in

elevating cylinder. Then, bleed elevating cylinder (para 6–3a.).

12

7

8

9

10

3

11