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TM 5-4210-220-12
Section IV. OPERATION UNDER UNUSUAL CONDITIONS.
2-14. OPERATION IN EXTREME COLD.
WARNING
Doors and access panels may freeze shut and walking surfaces become slippery and hazardous
from formation of ice in freezing weather. Be sure that all ice is removed as quickly as possible.
a.
No special procedures other than the use of the winterization system are required for operation in cold
climates. The winterization system should always be used whenever the truck is on standby where the ambient
temperature is below 32F (0C).
b.
After firefighting, remember to dram residual water from all piping as detailed in para. 2-13.
NOTE
If the truck cannot build up air pressure to operate the air operated valves, air can be injected
into the system using the shop connection air valve mounted on the left side of the truck
between the pump body steps.
c.
If the truck is not operated and ambient temperature is below 32F (0C), perform steps 1 and 2 paragraph 2-
13b; then steps 6 through 12, paragraph 2-13d.
d.
Be sure that all PMCS procedures and lubrication recommendations to maintain the vehicle operational in
cold weather are followed.
2-15. OPERATING IN EXTREME HEAT.
a.
When operating in a very hot environment, pay extra attention to the engine and transmission temperature
and oil pressure gages. Use auxiliary coolant heat exchanger when pumping m the structural mode.
b.
Be sure that lubricant and coolant recommendations for operation under extreme heat conditions are
followed.
2-16. OPERATION IN AREAS WITH SALT AIR AND MIST.
a.
In areas where salt air and sea spray are common, measures must be taken to protect the vehicle from
corrosion. Use wax and/or other surface protection agents frequently on painted and chrome plated surfaces. Coat all
other exposed metallic surfaces with protective oil as necessary.
b.
If salt water is used for firefighting, the firefighting system, including all hoses used, should be flushed with
potable water on return to base.
NOTE
The pump is designed for use with fresh water. Therefore, if salt water is used, the pump must
be flushed with fresh water to prevent corrosion of pump components.
2-17. OPERATION IN SNOW.
a.
Operating in areas with heavy snow fall can cause problems unless walkways, hose beds and control
equipment are continuously cleared of snow. If not cleared frequently, the equipment including exposed controls may
become difficult to operate.
b.
When driving through deep snow or snow banks use the four-wheel-drive and engage the differential locks.
Change 6 2-62
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