TM-9-2350-311-10

HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A2, M109A3, M109A4 AND M109A5

TECHNICAL MANUAL; OPERATOR’S MANUAL

NOVEMBER 1994

TM-9-2350-311-10 - Page 230 of 775

TM 9-2350-311-10

2-10 OPERATING PROCEDURES — CONTINUED

2-10.8 Traversing and Elevating — Continued

b. Power Traversing — Continued

3

4

5

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7

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9

Turn CAB POWER switch (14) to ON. CAB POWER indicator light (15) should light.

If pressure exceeds 1400 psi with CAB POWER switch to ON, turn CAB POWER switch to OFF

to prevent equipment damage and notify unit maintenance.

Ensure pressure gage (16) has normal pressure of 925 to 1225 psi (6378 to 8446 kPa) at 70° F (21

0

C).

Turn TRAVERSE CONTROL switch (17) to POWER position. TRAVERSE CONTROL indicator light (18)

should light.

NOTE

If electricity for clutch valve fails, loss of pressure to traversing mechanism occurs and cab

cannot traverse normally. Perform step (6) on M109A4/M109A5 howitzers and notify unit

maintenance.

To overcome clutch valve (19) failure, pull up on override lever (20) on clutch valve and hold while

traversing.

Turn gunner’s control handle (21) right (to traverse right) or left (to traverse left).

To stop rotation, return gunner’s control handle (21) slowly to center position and wait until cab stops.

Turn CAB POWER switch (14) to OFF and place TRAVERSE CONTROL switch (17) to MANUAL

position.

c. Manual Traversing

1

Place TRAVERSE CONTROL switch (17) in MANUAL position.

2 Turn handwheel assembly (22) and cab will rotate in same direction as rotation.

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