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Cold Weather Operation
1. Cold weather causes lubricants to congeal, insulation
and rubber parts to become hard, which may lead to
problems found in bearings, electrical systems, and
air systems. Moisture attracted by warm parts can
condense, collect and freeze to immobilize
equipment. The truck/semitrailer operator must
always be alert for indicators of cold weather
malfunctions.
2. During any extended stop period, neither the service
nor parking brake should be used as they can freeze
up. Use wheel chocks to secure the vehicle from
moving.
3. Check all structural fasteners, air system fittings,
gaskets, seals and bearings for looseness that can
develop due to contraction with cold. Do not
over-tighten.
4. Check tire inflation. Tire inflation decreases when the
temperature decreases.
5. Periodically check drain holes in the bottom of the
relay valve (for trailers with air brakes) and storage
compartments. They must be open at all times to
avoid moisture entrapment.
OPERATING INSTRUCTIONS
Hot Weather Operation
1. Hot weather operation can create certain problems
which must be checked. Expansion of parts result in
tightening of bearings, fasteners, and moving parts.
Failure of gaskets or seals can occur.
2. The semitrailer should be parked in the shade if
possible. Long exposure to the sun will shorten
service life of rubber components (i.e., tires, light and
hose grommets, hoses, etc.) and paint life.
3. Check tire pressure early in the day before beginning
operations while the tire is cool. Replace all valve
stem caps after checking.
4. If the area is extremely humid, protect electrical
terminals with ignition insulation spray. Coat paint
and bare metal surfaces with an appropriate
protective sealer.
5. The use of a filter-lubricator in the towing vehicle's air
delivery system is recommended.
3-27
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