TM-9-2320-260-20

TRUCK, 5-TON, 6X6, M809 SERIES (DIESEL)

TECHNICAL MANUAL; UNIT MAINTENANCE

APRIL 1995
TM-9-2320-260-20

  TM-9-2320-260-20 - Page 174 of 1337

TM 9-2320-260-20
Table 2-2. Mechanical Troubleshooting (Contd).
MALFUNCTION
I
TEST OR INSPECTION
I
CORRECTIVE ACTION
I
PERSONNEL HOT WATER HEATER KIT
73. PERSONNEL HOT WATER HEATER DOES NOT HEAT CAB
Step 1. Engine does not reach normal operating temperature (malfunction 19).
Step 2. Check personnel hot water heater for clogged, broken, and leaking inlet/outlet hoses,
Replace personnel hot water heater hoses if leaking or collapsed (para. 14-11).
Step 3. Check for proper operation of heater defroster and heater diverter vents and doors.
Replace control cables if bent or broken (para. 14-11).
Step 4. Check electrical system (table 2-4, electrical troubleshooting, malfunction 37).
Step 5. Check heater blower motor and fan for proper operation (TM 9-2320-260-10).
Replace personnel hot water heater if damaged (para. 14-10).
END OF TESTING!
PERSONNEL FUEL BURNING HEATER/POWER PLANT HEATER KIT
74. HEATER WILL NOT OPERATE
WARNING
Diesel fuel is flammable. Do not perform this procedure near fire,
flame, or sparks. Injury or death to personnel could result.
Step 1. Check electrical system (table 2-4, electrical troubleshooting, malfunction 38).
Step 2. Check fuel shutoff valve for proper operation.
Replace fuel shutoff valve if damaged (or stuck in “OFT’” or partial “ON” position)
(para. 14-5).
Step 3. Check fuel lines for breaks, bends, kinks, or leaking joints.
Step 4.
Step 5.
Step 6.
Step 7.
Replace fuel lines if broken, bent, kinked, or leaking (TM 9-243).
Check fuel pump discharge.
a. Remove fuel line from fuel pump output (para. 14-4).
b. Use clean container for fuel discharge recovery.
c. Position heater control box to “RUN” position.
d. If fuel pump fails to pump adequate amount of fuel, (0.5 pt [0.219 L] in 30 seconds),
replace (para. 14-4).
Inspect exhaust system for restrictions.
If exhaust pipe is restricted or damaged, repair or replace (para. 14-6).
Check for proper operation of defroster and heater diverter control cables (TM 9-2320-
260-10).
If control cables or vent are broken, replace (para. 14-12).
Replace fuel burning or power plant heater if fuel burning heater still fails to operate
(para. 14-2 or 14-14).
END OF TESTING!
2-87


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