equipment used to facilitate or gain access to an area to be repaired
accessories
components for the vehicle which enhance the operation or extend longevity
air brake systems
braking system controlled or operated by directional flow of compressed air
air suspension system
type of suspension system using air springs
antifreeze
a liquid coolant which allows for heat dissipation
antilock brake system (ABS)
electronically controlled brake control system to sense and react to wheel lockup
chassis
component that attaches the trailer body to the suspension. It includes frames, subframes and slider locking mechanisms. It distributes and carries the weight of the load to the suspension system.
combination vehicles
two or more trailers attached by coupling devices
coupling devices
device used to connect power units to one or more trailers together or to jeeps, converters and boosters. Devices can also connect chassis to containers.
diagnose
tasks involved in inspecting, testing and determining faults
electric brake system
braking system whose components are operated by a controlled voltage signal
electronic control unit (ECU)
module which monitors and controls functions of a trailer
frame
base structure on which the rest of the trailer is built
gladhand
sealed coupling breakaway device that joins compressed air systems from one unit to another such as emergency or service systems
heating and refrigeration systems
components which are used to keep a load’s temperature constant through heating or cooling
high-voltage electric drive system
system that uses high AC voltages to drive electric components of a temperature control system
hybrid and alternative drive system
system that uses combinations of electric motors, batteries and alternative power to drive components of a temperature control system
hydraulic brake system
braking system controlled or operated by hydraulic fluid pressure
hydraulic system
system which uses fluid under pressure to transmit power through tubes or hoses to operate different components on a trailer
landing gear
components which are used to support the weight of the trailer and load when disconnected from the towing unit
power unit
motorized towing unit
rubber suspension system
type of suspension system using rubber cushions
sensory inspection
diagnosing or inspecting using sight, sound, smell or feel
service
activities which include repair, replacement, rebuild, reconditioning, adjustment and general maintenance of trailers and components
slider
assembly to allow movement of a sub-frame
slider locking mechanism
locking mechanism to secure the sub-frame to the chassis
spread
distance between two axles
spring suspension system
suspension system using spring packs
staging equipment
equipment that supports and stabilizes trailers to facilitate repair
sub-frame (bogie)
component to which the axles and suspension systems are attached
suspension
components which absorb road surface irregularities to smooth vehicle ride; it is designed to permit controlled wheel movement over irregular surfaces; basic types include spring, air and rubber
towing unit
unit that tows the trailer; may be a power unit or a trailer
wheel end assembly
rotating parts at the end of the axles; includes hubs, bearings, seals, rims and tires