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About the trailer
Coupling components
WARNING
Improper coupling between a tractor and a trailer may cause serious
accidents, which may result in property loss, serious injury, and
death. Ensure the following before each trip:
• The trailer has been properly coupled with the tractor.
• The tractor has the sufficient capacity and specifications to safely
tow the trailer.
The principle of the coupling system is to connect the tractor to
the trailer. The integral components of the coupling system are
the trailer kingpin on the upper coupler and the tractor's fifth
wheel.
Upper coupler and kingpin
The upper coupler is located on the front bottom side of the
trailer, and it transfers the weight of the front of the trailer to the
tractor's fifth wheel plate. This fabricated steel assembly
incorporates the kingpin connected with the tractor fifth wheel to
pull the tractor.
1
2
Upper coupler
1
Kingpin
2
26
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