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 345 of 828

TM 9–2350–311–20–2

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7

Move gunner’s control handle (9) slowly left or right. Note that pressure gage needle (10) will move.

8

Watch pressure gage needle (10) as it drops from operating pressure until it flutters, then drops sharply to 0

psi (0 kPa). The reading at which the pressure gage needle fluttered is the amount of precharged nitrogen in

the main accumulator. Precharged nitrogen pressure in the main accumulator must be from 500 to 550 psi

(3448 to 3792 kPa) at the local surrounding temperature.

NOTE

If main accumulator nitrogen pressure is below 500 psi (3448 kPa), charge main accumulator

(para 19–4).

9

Turn CAB POWER switch (4) and MASTER switch (3) to OFF.

10

Connect wire 645 (5) to pressure switch (6) or quick disconnect (7) near pressure switch.

11

Turn MASTER switch (3) and CAB POWER switch (4) to ON to charge hydraulic system.

b.

Service

Service main accumulator assembly (para 19–4).

3

4

8