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 139 of 828

TM 9–2350–311–20–2

3–30

3–3

TROUBLESHOOTING CHART — CONTINUED

c.

CAB TRAVERSING SYSTEM — CONTINUED

HYDRAULIC FILTERS

AIR LINE FILTER

HYGROSCOPIC

BREATHER

MAIN

ACCUMULATOR

POWER PACK ASSEMBLY

SIGHT

GAGE

ASSEMBLY

CLUTCH

VALVE

POWER RELAY

BOX ASSEMBLY

GUNNER’S SELECTOR

SWITCH BOX ASSEMBLY

SLIP RING ELEC-

TRICAL CONTACT

HOLDER

BYPASS VALVE

ASSEMBLY

AND SOLENOID

HYDRAULIC

MOTOR

GUNNER’S CONTROL

ASSEMBLY (LEFT)

CAB TRAVERSING SYSTEM (M109A4/M109A5 HOWITZERS)

ELECTRICAL

CONTROL

CIRCUIT

PUMP PRESSURE –

925 TO 1225 PSI

(6378–8446 kPa)

DRAIN RESERVOIR

PRESSURE, 0 PSI

(0 kPa)

OPERATING PRESSURE

900 PSI (6206 kPa)