TM-9-2320-273-10
TRUCK, TRACTOR, LINE HAUL; LIGHT EQUIPMENT TRANSPORTER; TRUCK CHASSIS; MEDIUM EQUIPMENT TRANSPORTER
TECHNICAL MANUAL; OPERATOR’S MANUAL
DECEMBER 2012
TM-9-2320-273-10 - Page 280 of 452
ENGINE - CONTINUED
SYMPTOM
Excessive exhaust smoke after engine reaches normal operating temperature of
160–185° F (71–85° C) for M915 through M920 or 180–200° F (82–93° C) for
M915A1.
MALFUNCTION
Restricted air filter, contaminated fuel, or engine malfunction.
CORRECTIVE ACTION
1. Check air filter restriction gauge. If gauge indicates restriction (red
instead of green), notify supervisor.
2. Open fuel tank filler cap and check for obvious fuel contamination. If
fuel is contaminated, notify supervisor.
3. Check for smell of unburned fuel in or around engine cab area. If smell
of unburned fuel is present, notify supervisor.
SYMPTOM
Engine retarder does not reduce tractor speed.
MALFUNCTION
Engine retarder is not being operated correctly.
CORRECTIVE ACTION
Check engine retarder is engaged. Press down on engine retarder foot pedal
and take foot completely off of accelerator pedal. If operating retarder
control correctly but retarder system is not slowing vehicle, notify
supervisor.
SYMPTOM
Excessive exhaust noise or fumes in or near cab.
MALFUNCTION
Faulty exhaust system components.
TM 9-2320-273-10
0023
0023-6
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