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 172 of 828

TM 9–2350–311–20–2

3–61

PICTORIAL VIEW

ELECTRICAL SCHEMATIC

1

CAB POWER PACK HYDRAULIC PUMP DRIVE MOTOR CIRCUIT (M109A2/M109A3 HOWITZERS)

9

5

8

10

6

2

3

7

1

4

1

5

3

2

1

8

7

10

4

11

A

645

LEGEND:

1. Contact arm assembly

2. Power relay box assembly

3. Pressure switch

4. Power pack assembly

5. Gunner’s selector switch box assembly

6. Segment board

7. Power valve solenoid

8. Traverse clutch

9. Traverse bypass valve assembly

10. Elevation selector valve assembly

11. Hydraulic pump motor