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TM 5-4210-230-14&P-1
SAFETY CHECKS AND PRECAUTIONS
COOLING
CAUTION
Misuse, misapplication or modification of radiator cooling fans can result in serious personal injury and
property damage. The following safety recommendations should be adhered to when servicing radiator
cooling fans.
1.
Extreme caution must be exercised when working on vehicles equipped with an Automatic Fan Clutch. The fan clutch is
controlled by a temperature control switch which starts the fan in motion only after the engine coolant reaches a
predetermined temperature.
Service personnel should never reach or permit objects to come within the radius of the fan blade while the engine is
running, but the fan blade is not in motion.
2.
Do not operate the engine with a fan which has been bent, mutilated, modified or in any way damaged.
3.
Do not operate the engine if the fan makes physical contact or strikes against any other engine accessory while in operation.
4.
Do not rebalance a fan.
5.
Insure that all fan mounting bolts are installed at the specified torque.
6.
Install fans such that the word "front" stamped on the fan hub faces toward the radiator.
7.
Perform all required maintenance on the subassembly to which the fan is attached (i.e., water pump or fan drive, etc.).
8.
Take special care not to make modifications which will increase the operating speed of the fan.
9.
Do not install a fan on an engine for which the fan has not been approved. Likewise, install a subassembly to which the fan
is attached (water pump, fan drive, etc.) only if approved for use on the engine.
10.
If the fan contains any plastic or rubber component, have the fan inspected by a qualified mechanic after exposure to
excessively high temperatures (above 250° F ambient temperature).
11.
Replace the fan if there appear to be indications of excessive corrosion or erosion in the fan.
ELECTRICAL
Horn: Occasionally blow the horn (air or electric) for satisfactory operation.
Instruments: Check operation of all instruments and gauges.
Lights: Be sure lights, regardless of type or where they are located, will illuminate at all times.
Wiring: Replace loose, weathered, cracked or broken wires to safeguard against breakdown on the road or possible shorts.
EXHAUST SYSTEM
Inspect heat shields for proper installation or location. Maintain exhaust system (mufflers, exhaust pipes, tail pipes, joints)
integrity to assure no exhaust fumes can enter cab area.
CAUTION
Be assured that no fuel lines, brake lines, hoses or electrical wiring is contacting the exhaust system as this can
result in the following.
FUEL LINES: Personal injury or property damage is a high probability, should a fire occur due to fuel leakage being ignited
by an external ignition source.
BRAKE LINES: A defective or ruptured brake line can allow a loss of braking ability to stop the vehicle; thus a vehicle crash
could result with property damage or severe personal injury being incurred.
HOSES: Bodily harm from steam or hot water can result from broken heater or radiator hoses. Also deteriorated steering
gear hoses could result in property damage or personal injury should the vehicle crash due to loss of steering gear fluid.
ELECTRICAL WIRING : Shorts in the electrical wiring, such as the headlights, horn, electric windshield wipers, etc. could
result in a fire or stalled vehicle with resultant bodily injury.
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