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TM 5-4210-220-12
Table 4-2 UNIT TROUBLESHOOTING - Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
6d
EXHAUST SMOKES EXCESSIVELY
Step 1
Check blower wheel is tight on shaft
Tighten setscrew, (see para. 4-19)
Step 2
Check blower motor
Replace as required, (see para. 4-19)
6e
BOOSTER HEATER OVERHEATS AND TRIPS
Step 1
APU shutdown too quickly
Allow APU or main engine to run for at least 2 minutes after heater shutdown. Reset
overheat relay.
Step 2
Water temperature thermostat faulty
Replace thermostat and reset overheat relay
7a
LOSS OF COOLANT FROM RADIATOR SYSTEM
Step 1
Check all hoses when engine at working temperature
Replace hose/fittings if any are leaking, (see para. 4-20)
NOTE
Hoses are also connected to winterization components
Step 2
Check radiator for leakage
Repair or replace radiator, (see para. 4-20)
Step 3
Check cab heater for leak
Repair or replace cab heater or components, (see para. 4-12)
Step 4
Check pump body heater for leaks
Repair or replace heater, (see para. 4-20)
Step 5
Check winterization heater for leaks
Repair or replace heater, (see para. 4-15)
4-35
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