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 113 of 828
TM 9–2350–311–20–2
3–4
Change 2
3–2
QUICK GUIDE TO TROUBLESHOOTING — CONTINUED
CAB HYDRAULIC SYSTEM –
POWER PACK OPERATES CONTINUOUSLY WHEN CAB POWER
Continued
AND MASTER SWITCHES ARE ON.
3–3e. (5)
MAIN ACCUMULATOR WILL NOT HOLD DRY NITROGEN CHARGE.
Notify support maintenance.
GUNNER’S OR ASSISTANT GUNNER’S CONTROL HANDLE DOES
NOT RETURN TO NEUTRAL POSITION WHEN RELEASED.
3–3e. (6)
RAMMER HYDRAULIC
RAMMER DOES NOT OPERATE.
3–3f. (1)
SYSTEM
CAB POWER SYSTEM
ALL CAB ELECTRICAL COMPONENTS FAIL TO OPERATE.
3–3g. (1)
CAB ELECTRICAL COMPONENTS OPERATE NORMALLY, BUT CAB
POWER INDICATOR LIGHT DOES NOT ILLUMINATE.
3–3g. (2)
CAB LIGHTING SYSTEM
ONE OR MORE DOME LIGHTS ARE OUT, BUT SIGHTING EQUIPMENT
LIGHTS OPERATE.
3–3h. (1)
M118A2/M118A3 ELBOW TELESCOPE LIGHT IS OUT, BUT ALL
OTHER LIGHTS OPERATE.
3–3h. (2)
M145/M145A1 TELESCOPE MOUNT AND M117/M117A2 PANORAMIC
TELESCOPE LIGHTS ARE OUT, BUT ALL OTHER LIGHTS OPERATE.
3–3h. (3)
M15 ELEVATION QUADRANT LIGHT IS OUT, BUT ALL OTHER
LIGHTS OPERATE.
3–3h. (4)
ALL CAB LIGHTS ARE OUT.
3–3h. (5)
INTERCOMMUNICATION
INTERCOMMUNICATION SYSTEM WILL NOT
3–3i. (1)
SYSTEM
OPERATE.
AMPLIFIER AM1780/VRC DOES NOT KEY WHEN MIC BUTTON
IS PUSHED.
3–3i. (2)
DRIVER CANNOT COMMUNICATE.
3–3i. (3)
OPERATOR CANNOT COMMUNICATE AT GUNNER’S OR
COMMANDER’S CONTROL BOX.
3–3i. (4)
TELEPHONE OPERATOR CANNOT COMMUNICATE.
3–3i. (5)
NBC SYSTEM CIRCUIT
NBC CONTROL BOX ASSEMBLY INDICATOR LIGHT DOES NOT
ILLUMINATE, BUT NBC SYSTEM OPERATES.
3–3j. (1)
NBC SYSTEM DOES NOT OPERATE.
3–3j. (2)
NBC CONTROL BOX ASSEMBLY INDICATOR LIGHT ILLUMINATES,
BUT M2A2 AIR PURIFIER DOES NOT OPERATE.
3–3j. (3)
NBC CONTROL BOX ASSEMBLY INDICATOR LIGHT ILLUMINATES,
BUT GUNNER’S M3 ELECTRICAL AIR HEATER DOES NOT OPERATE.
3–3j. (4)
NBC CONTROL BOX ASSEMBLY INDICATOR LIGHT ILLUMINATES, BUT
CANNONEER NO. 1’S M3 ELECTRICAL AIR HEATER DOES NOT
OPERATE.
3–3j. (5)
NBC CONTROL BOX ASSEMBLY INDICATOR LIGHT ILLUMINATES, BUT
SECTION CHIEF’S M3 ELECTRICAL AIR HEATER DOES NOT OPERATE. 3–3 (6)
NBC CONTROL BOX ASSEMBLY INDICATOR LIGHT ILLUMINATES, BUT
ASSISTANT GUNNER’S M3 ELECTRICAL AIR HEATER DOES NOT
OPERATE.
3–3j. (7)
Back to Top
