TM-9-2320-361-34
2-1/2-TON, 6x6, M44A2 SERIES TRUCKS (MULTIFUEL)
TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE
MAY 1992
TM-9-2320-361-34 - Page 46 of 764
TM9-2320-361-34
Table 2-1. Mechanical Troubleshooting (Contd).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE
ACTION
73.
74.
75.
76.
77.
78.
WINTERIZATION KITS
NOTE
Mechanical troubleshooting for personnel and engine coolant
heaters are the same. The following is for fuel burning personnel
heaters.
HEATER FAILS TO TURN ON
Bench test for defective control parts (para. 17-19 or 17-20).
If defective, replace control parts (paras. 17-2 through 17-18, as necessary).
END OF TESTING!
HEATER OVERHEATS - OVERHEAT SWITCH IS GOOD
Step 1.
Step 2.
Check for obstructed air flow.
If obstructed, clear obstructions from fuel supply air and ventilating air passages
(para. 17-8 or 17-14).
Check fuel control valve (para. 17-19 or 17-20).
Replace fuel control valve if defective (para. 17-6 or 17-12).
END OF TESTING!
HEATER OVERHEATS - CONTINUES TO RUN
Test overheat switch (para. 17-19 or 17-20).
Replace overheat switch if defective (para. 17-7 or 17-17).
END OF TESTING!
HEATER OUTPUT TOO LOW
Step 1. Check for obstructed fuel lines or contaminated fuel supply.
a. If obstructed, clear fuel supply lines (para. 17-8 or 17-14 for internal fuel supply and
TM 9-2320-361-20 for external fuel supply).
b. Drain fuel control valve (para. 17-19 or 17-20).
Replace fuel control valve if defective (para. 17-6 or 17-12).
Step 2. Check fuel control valve (para. 17-19 or 17-20).
Replace fuel control valve if defective (para. 17-6 or 17-12).
END OF TESTING!
HEATER SMOKES AND BANGS WHEN STARTING
Perform malfunction 76, step 2.
END OF TESTING!
BLOWER WILL NOT STOP AFTER TURN OFF
Check flame detector switch condition (para. 17-19 or 17-20).
Replace flame detector switch if defective (para. 17-2 or 17-15).
END OF TESTING!
2-31
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