If the lamp is not faulty, check the power supply and the
power circuit through the circuit breaker.
Refer to fig. 71.20 for probable causes and
remedies for malfunctions in the winterization kit. The
f. If these steps fail to localize the trouble, check
troubleshooting chart is applicable to both the liquid and
the operation of the preheater, the preheat relay, the
fresh air heaters. Refer to applicable paragraphs for
power relay, and other electrical components.
additional tests to further analyze malfunctions which
may occur within specific components.
181. Fuel System Test
Make certain the feed line shut-off valve is
180. Electrical System Test
Make certain power supply is adequate for the
b. Check the fuel supply. Make certain the fuel is
the proper type for the heater and that it is not
Check all electrical connections for tightness
and good condition.
If the fuel pump is not operating, test as
Check limit switch. If switch is open, correct
described in paragraph 201.
the reason for overheating of the heater combustion
If the fuel pump is operating, disconnect the
chamber. Reset limit switch manually.
pump outlet connections and check for fuel flow. If flow
Check the circuit breaker reset button position
does not occur, check the fuel lines for obstructions.
on the control box. The power supply circuit is closed
Make sure the fuel filter is clean.
when the button is pushed in. If the button jumps out
e. If a flow occurs, reconnect the pump outlet and
when the heater is started, test further for the electrical
remove the regulator valve and the nozzle assembly.
Test the operation of these units as described in
Press in "press-to-test" indicator lamp on the
paragraphs 192(d) and 193(b).
control box. If the power supply circuit through the
circuit breaker is complete, the lamp light. If the lamp
does not light, make certain the lamp is not burned out.
Section V. GENERAL
Repair procedures which are standard or
Part numbers for items in this
obvious may be excluded from this supplement. In
section are included in the TM 5-
instances where specific instructions have been omitted,
4210-205-35 Supplement Parts List.
procedures shall be performed in accordance with good
Section VI. BODY CHASSIS OR HULL AND ACCESSORY ITEMS
185. Radiator Shutter Assembly
183. Oil Pan Box Assembly
Repair consists of replacement of defective
Refer to TM 5-4210-205-12
Refer to fig.
71.21 for assembly
Oil Pan and battery Box Heat Exchanger
186. Heater Control Box Assembly
Refer to TM 5-4210-205-12 for repair
Remove the two screws (14) on each side of the
nameplate (13) and separate the box assembly (10)