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 329 of 828

TM 9–2350–311–20–2

Change 2

6–13

d.

Charging

CAUTION

If hydraulic pressure reaches 1400 psi (9653 kPa), immediately turn CAB POWER switch to OFF to

avoid damaging system. Discharge hydraulic system (para 6–3a.), and turn CAB POWER switch to

ON. If pressure again reaches 1400 psi (9653 kPa), turn CAB POWER switch to OFF and

troubleshoot the pressure switch.

1

Lower travel lock and unlock turret lock (TM 9–2350–311–10).

2

Turn MASTER switch (5) and CAB POWER switch (6) to ON to charge elevating and traversing systems.

3

Rotate elevating hand pump (16) clockwise until movement of elevation cylinder is detected.

4

Turn TRAVERSE CONTROL switch (24) to POWER position. Traverse cab one full revolution in each direction.

5

Set MASTER switch (5) and CAB POWER switch (6) to OFF.

6

Check hydraulic fluid level at sight gage (21). Fluid must be at FULL AFTER PUMPING mark (25). If neces-

sary, add hydraulic fluid (para 6–3c.).

5

6

24

16