TM-9-2320-260-20
TRUCK, 5-TON, 6X6, M809 SERIES (DIESEL)
TECHNICAL MANUAL; UNIT MAINTENANCE
APRIL 1995
TM-9-2320-260-20 - Page 154 of 1337
2-12
TM 9-2320-260-20
e.
Omissions. This manual cannot list all mechanical malfunctions that may occur. If a malfunction
occurs that is not listed in table 2-2, notify your supervisor.
WARNING
• Do not operate a deadlined vehicle without preliminary
inspection. Failure to do so may cause further damage to
a disabled component and possible injury to personnel.
●
Do not operate vehicle in an enclosed area without adequate
ventilation. Failure to do so may result in injury to personnel.
●
Hearing protection is required for driver, co-driver, and
mechanic when engine is running. Noise levels produced by
this vehicle exceed 85 dB, which may cause injury to personnel.
MECHANICAL SYSTEMS TROUBLESHOOTING
SYMPTOM INDEX
MALFUNCTION
NO.
MALFUNCTION
TROUBLESHOOTING
PROCEDURE
PAGE
ENGINE
Engine will not crank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Engine cranks but will not start. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Engine cranks slowly, hard to start. . . . . . . . . . . . . . . . . . . . . . . . . .
Engine misfires or stops during normal operation . . . . . . . . . . . . . . .
Poor acceleration and/or lack of power. . . . . . . . . . . . . . . . . . . . . . . .
Engine surges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Excessive oil loss or consumption during normal operation and idle . . .
Engine oil pressure too high or too low at normal operating
temperature . . . . . . . . . . . . . . . . . . . . . . . . .
Excessive fuel consumption . . . . . . . . . . . . . . . .
Black exhaust smoke atidle . . . . . . . . . . . . . . . .
Excessive vibration or clunking . . . . . . . . . . . . .
COLD START SYSTEM
Engine cranks but will not start in cold weather .
Cold start primer pressure gage reads improperly
EXHAUST SYSTEM
Exhaust color blue during normal operation . . . .
. . . . . . . . . . . . . . .
. . . . . . . . . . . . . . .
. . . . . . . . . . . . . . .
. . . . . . . . . . . . . . .
. . . . . . . . . . . . . . .
. . . . . . . . . . . . . . .
. . . . . . . . . . . . . . .
Exhaust color white during normal operation and idle . . . . . . . . . . . .
Excessive exhaust noise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Exhaust fumes in cab . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
COOLING SYSTEM
Engine coolant temperature gage above 230°F (110°C) . . . . . . . . . . . .
Engine does not reach normal operating temperature. . . . . . . . . . . . .
Loss of coolant during normal operation . . . . . . . . . . . . . . . . . . . . . .
CLUTCH
Vehicle creeps with clutch depressed. . . . . . . . . . . . . . . . . . . . . . . . .
Clutch drags, slips, or does not engage . . . . . . . . . . . . . . . . . . . . . . .
2-70
2-70
2-71
2-71
2-71
2-72
2-72
2-72
2-72
2-72
2-72
2-73
2-73
2-73
2-73
2-74
2-74
2-74
2-75
2-75
2-75
2-75
2-67
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