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Cold Weather Operation
For maintenance during low temperatures check for
frozen, sluggish or inoperable brakes, sagging light and
brake lines, broken connections, increased corrosion and
properly installed winter equipment.
1. Cold weather causes lubricants to congeal and
insulation and rubber parts to harden, 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. Drain air tanks daily.
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.
6. Use additives to prevent moisture accumulation in
the air lines and tanks during operation and storage.
This can be applied directly into air lines or by using
an additive appropriate for the climate applied
through the towing vehicle.
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.
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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.
Rocking Upper Coupler
Compatibility
The rocking coupler on the Landoll Bottom Dump is
designed to reduce twisting stresses forced upon the
trailer during operations on uneven terrain. It is coupled
via a single axis hinged tractor fifth wheel.
If the towing vehicle uses a multi-axis oscillating fifth
wheel, the rocking coupler on the trailer must be replaced
with a rigid coupler. The rigid couple is available from the
Landoll Parts Distribution Center, 1-800-423-4320.
Gate Control Valve Operation
The gate control valve can be operated from the cab of
the towing vehicle or manually from the gate control valve
assembly.
1. To operate the gate cylinder valve remotely, energize
the solenoid from inside the cab of the towing
vehicle. The energized solenoid provides pilot
pressure to operate the spool and pressurized the
small area bleeder pilot by the ball check. The air in
the bleeder pilot acts as a return spring to return the
spool to its original position. This air may eventually
leak off,
See Figure
2. Operate manually only through a deenergized
solenoid. The bleeder pilot is used to vent any air
which has not leaked off after a remote operation.
After the solenoid is deenergized and the bleeder
pilot is vented, the manual operator can then be
moved in either direction to control the cylinder.
3. Periodically disassemble and clean the valve.
OPERATING INSTRUCTIONS
3-1.
3-7
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