TM-9-2350-311-20-1

HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A2, M109A3, M109A4 AND M109A5

TECHNICAL MANUAL; UNIT MAINTENANCE MANUAL FOR HULL, POWERPLANT, DRIVE CONTROLS, TRACKS, SUSPENSION, AND ASSOCIATED COMPONENTS

AUGUST 1994

TM-9-2350-311-20-1 - Page 104 of 1275

3-2 QUICK GUIDE TO TROUBLESHOOTING — CONTINUED

ITEM

SYMPTOM

PRIMARY

ALTERNATE

BATTERY

ENGINE CRANKS SLOWLY

MASTER RELAY

MASTER SWITCH INDICATOR LIGHT

IS LIT

MASTER SWITCH INDICATOR LIGHT

FAILS TO OPERATE; MASTER

SWITCH IS ON

STARTER

ENGINE DOES NOT CRANK; ALL

ELECTRICAL ACCESSORIES

OPERATE

COMBAT OVERRIDE SWITCH WILL

NOT OVERRIDE

ENGINE CRANKS FOR SHORT TIME

ONLY; BATTERY POWER LEVEL IS

CORRECT

ENGINE

ENGINE CRANKS BUT FAILS TO

START

ENGINE IDLES OVER 650. RPM

ENGINE DOES NOT ACCELERATE

PROPERLY OR DOES NOT DEVELOP

FULL POWER

ENGINE DOES NOT MAINTAIN

STEADY RPM

ENGINE USES EXCESSIVE OIL

ENGINE USES EXCESSIVE FUEL

WHITE EXHAUST SMOKE IS PRESENT

Para l-5, NG 30

Para 3-3a

Para 3-3b(1)

None

Para 3-3b(2)

None

Para l-5, NG 20

and/or NG 60

Para 3-3d(2)

Para 3-3d(3)

Para 3-3e(1)

Adjust hand throttle

control rod and

accelerator pedal

(para 9-15 and 9-16)

Para 3-3e(2)

None

Para 3-3e(3)

Check oil lines, oil filters,

and engine cover for

excessive leaks

Para 3-3e(4)

Para 3-3e(5)

Para 3-3c,

M109A2/M109A3

Para 3-3d(1),

M109A4/M109A5

None

None

None

None

None

None

3-4

TM 9-2350-311-20-1