fifth wheel lockup may allow disengagement of the
tractor from the trailer, possibly resulting in serious
personal injury or death.
20.1 If the vehicle is a truck-trailer combination,
be sure the trailer hitch is locked and the
safety cable or chains are connected. Be
sure air hoses and the light cable are con-
nected.
WARNING
Check to be sure that the trailer hitch is securely
connected to the truck. Failure to lock the trailer
hitch and to connect safety cables or chains may
allow disengagement of the truck from the trailer,
possibly resulting in serious personal injury or
death.
20.2 If the vehicle is a tractor-trailer combination,
check that the fifth wheel lock mechanism is
locked to the trailer kingpin. Refer to Chap-
ter 11 for instructions.
WARNING
Repair or replace any damaged fifth wheels, slides,
or mountings. The use of damaged fifth wheel parts
may cause the trailer to detach from the tractor,
possibly resulting in serious personal injury or
death.
NOTE: For adjustment and replacement in-
structions, refer to Group 31 of the
Cargo
Workshop Manual
.
20.3 With the trailer unhooked from the tractor,
inspect the fifth wheel (daily) for the follow-
ing conditions:
• Loose nuts or broken bolts on the fifth
wheel assembly, slide mechanism,
and mounting brackets. Replace bro-
ken bolts, and tighten loose nuts.
• Cracks or wear on the fifth wheel as-
sembly, slide mechanism, and mount-
ing brackets. Replace each damaged
or worn component.
• Incorrect jaw locking action, and
cracks or wear on the jaw locking
mechanism. Replace the mechanism
if cracked or worn. Repair it if the jaw
locking action is incorrect.
• Gouges or wear on the fifth wheel
plate. Replace the plate if damaged or
worn.
Pretrip Inspection and Daily Maintenance
9.11
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