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 112 of 828
TM 9–2350–311–20–2
Change 2
3–3
3–2.3
Quick Guide to Troubleshooting List
ITEM
SYMPTOM
PARAGRAPH
BREECH MECHANISM
BREECH DOES NOT OPEN MANUALLY.
3–3a. (1)
BREECH DOES NOT CLOSE COMPLETELY.
3–3a. (2)
BREECH DOES NOT OPEN AUTOMATICALLY AFTER FIRING.
3–3a. (3)
CANNON
JERKY RECOIL.
3–3b. (1)
EXCESSIVE RECOIL FORCE.
3–3b. (2)
EXCESSIVE RECOIL TRAVEL AT HIGH ANGLE OF FIRE.
3–3b. (3)
CANNON DOES NOT RETURN TO BATTERY.
3–3b. (4)
PRIMER DOES NOT FIRE.
3–3b. (5)
PRIMER NOT EJECTED PROPERLY. Replace cartridge extractor.
5–4
CAB FILLS WITH SMOKE OR GASES AFTER FIRING.
3–3b. (6)
BORE EVACUATOR OR MUZZLE BRAKE THRUST COLLAR BECOMES
LOOSE. Replace setscrew, spring, or bearing ball.
5–1
CAB TRAVERSING SYSTEM
CAB WILL NOT TRAVERSE UNDER POWER OR MANUALLY, BUT
HYDRAULIC PRESSURE IS NORMAL AND CAB LIGHTING OPERATES. 3–3c. (1)
MANUAL TRAVERSE HANDWHEEL ROTATES WHILE TRAVERSING IN
POWER.
3–3c. (2)
CAB WILL NOT TRAVERSE UNDER POWER, MANUAL OPERATION
IS NORMAL.
3–3c. (2.1)
CAB TRAVERSES UNDER POWER, BUT TRAVERSE CONTROL
INDICATOR LAMP DOES NOT LIGHT.
3–3c. (3)
CAB WILL NOT TRAVERSE FREELY IN MANUAL OR POWER MODES.
3–3c. (4)
CAB CREEPS.
3–3c. (5)
ELEVATING SYSTEM
CANNON DOES NOT ELEVATE OR DEPRESS UNDER POWER OR
MANUALLY, BUT HYDRAULIC PRESSURE IS NORMAL.
3–3d. (1)
CANNON MOVES BY ONLY ONE CONTROL HANDLE, BUT MANUAL
OPERATION IS NORMAL.
3–3d. (2)
CANNON WILL NOT MOVE UNDER POWER FROM EITHER CONTROL
HANDLE, BUT MANUAL OPERATION IS NORMAL. Notify support maintenance.
CANNON DOES NOT ELEVATE OR DEPRESS SMOOTHLY.
3–3d. (3)
CANNON DOES NOT ELEVATE OR DEPRESS USING MANUAL
ELEVATION SYSTEM OR SYSTEM IS INEFFICIENT, BUT CANNON
WILL OPERATE UNDER POWER.
3–3d. (4)
CAB HYDRAULIC SYSTEM
POWER PACK HYDRAULIC PUMP MOTOR DOES NOT OPERATE,
BUT CAB LIGHTING SYSTEM OPERATES NORMALLY.
3–3e. (1)
HYDRAULIC PRESSURE IS NORMAL, BUT HYDRAULIC POWER
IS NOT BEING SUPPLIED.
3–3e. (2)
HYDRAULIC FLUID OVERFLOWS FROM TOP OF SIGHT GAGE OR
CONTAMINATED CRYSTALS IN HYDROSCOPIC BREATHER.
3–3e. (3)
HYDRAULIC PUMP MOTOR ON/OFF CYCLE IS RAPID.
3–3e. (4)
HYDRAULIC PUMP MOTOR OPERATES WHEN MASTER SWITCH IS
ON AND CAB POWER SWITCH IS OFF. Replace electromagnetic relay
in power relay box assembly.
8–13
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