Operate the power unit for at least 1 hour after adding water to batteries. Water added to
batteries may freeze unless it is immediately mixed with electrolyte. Remove frozen batteries
from the power unit immediately upon discovery to avoid damage caused by leaking from
cracked cases when the battery thaws.
2-18. Operation in Extreme Heat
The power unit will operate satisfactorily at ambient temperatures up to 125F (52C).
The operation of the power unit in extreme heat increases the evaporation rate of water from the battery
electrolyte. Check battery electrolyte level frequently (para 2-1b) during extreme heat conditions.
2-19. Operation in Dusty or Sandy Areas
Erect protective shield for power unit. Dust and sand shorten life of equipment parts and cause mechanical
failure. Utilize natural barriers. Wipe down power unit at frequent intervals using approved cleaning solvent. If water is
plentiful, wet down surrounding area beyond immediate operating areas.
Lubricate power unit in accordance with lubrication order. Clean oil fill and level cap and area around oil tank fill
opening frequently to prevent dust and abrasive material from entering engine.
Keep fuel supply tank cap tightly closed to prevent dust and sand from entering tank. Clean area around fuel
supply tank cap before removing cap to add fuel. Service fuel filters frequently (para 3-17 and 3-18).
Inspect and clean collector box on engine air inlet filter daily.
Keep all doors and panels on the power unit closed as much as possible.
2-20. Operation Under Rainy or Humid Conditions
The power unit is weatherized to operate satisfactorily under rainy or humid conditions. However, precautions
should be observed to insure protection of the equipment from excessive moisture.
Secure all panels and doors on power unit to minimize admittance of moisture to power unit components.
Close and secure instrument panel access door (fig. 1-1) after power unit has been started and adjusted for
operation to prevent accumulation of moisture on instruments and controls. Remove excess moisture from instrument
and control panels with a clean, dry cloth.
When power unit is not operating, cover unit with a tarpaulin or other protective covering to prevent entry of
2-21. Operation in Salt Water Areas
Wash down exterior of power unit regularly with fresh water. Avoid directing a water hose or other high pressure
water source at openings into interior of power unit. Wash down fins on condensers and evaporators from the inside to
the outside. Wipe down internal components with an approved cleaning solvent.
Carefully inspect components for evidence of corrosion and deterioration of insulation. Inspect all painted
surfaces for cracked, peeled, or blistered paint. Coat all exposed surfaces with an approved corrosion preventive paint.
Report severe corrosion damage to direct support maintenance.
2-22. Operation in Snow
The power unit will operate satisfactorily during snow conditions. However precautions should be taken to
prevent accumulation of snow at the power unit.
Observe procedures described for operation in extreme cold (para 2-17).
Erect suitable barriers to prevent air inlet and exhaust openings from being clogged by driven snow.
Barriers must not block the air flow during operation.
Prevent snow from collecting around access panels and doors so as to prevent opening.