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 402 of 775
TM 9--2350--311--10
3--4
Change 6
3--4
TROUBLESHOOTING
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
CAB HYDRAULIC SYSTEM
Power pack operates continuously when CAB POWER and MASTER switches are on
3--12
.......
RAMMER HYDRAULIC SYSTEM
Rammer does not operate properly
3--13
...................................................
Effort required to move rammer to rear stop or forward stowed position
3--13
....................
BATTERY
1.
ENGINE CRANKS SLOWLY; ENGINE FAILS TO CRANK.
Step 1. Check position of MASTER switch.
Turn MASTER switch to ON.
Step 2. Check position of transmission shift control lever.
Place transmission shift control lever in the “N” position.
Step 3. Check to see if battery cables are loose, broken, or corroded.
Tighten loose battery cables (para 3--5.3). If battery cables are broken or corroded, notify unit
maintenance.
Step 4. Check to see if BATTERY gage reads in normal range.
If BATTERY gage reads low, notify unit maintenance.
NOTE
During emergency conditions, attempt to tow-start vehicle (para 2--10.5). If the
engine still won’t start, notify unit maintenance.
2.
BATTERIES DO NOT STAY CHARGED.
Check for excessive use of electrical systems when engine is not running.
Turn all electrical accessories off when not in use.
MASTER RELAY
3.
MASTER SWITCH INDICATOR LIGHT FAILS TO OPERATE.
Step 1. Check position of MASTER switch.
Turn MASTER switch to ON.
Step 2. Check to see if LED is burned out by replacing it with a spare. Apply a thorough coating of silicone
compound (item 10.1, Appx D) to base of LED before installing the LED.
If LED is burned out, discard. If problem persists, notify unit maintenance.
Step 3. Check for loose electrical leads.
If electrical leads are loose, notify unit maintenance.
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