WARNING
Adjust the locks correctly to a maximum clear-
ance of 1/8 inch (3 mm). Incorrect adjustment of
the lock could cause the trailer to disconnect,
possibly resulting in serious personal injury or
death.
6.
Make a visual check for proper kingpin lockup.
Release the tractor parking brakes. Test for king-
pin lockup by pulling on the trailer against the
chocks. Check for correct maximum clearance
between the lock halves. If more than 1/8-inch
(3.2-mm) clearance exists between the lock
halves, the lock must be adjusted. See Group
31 of the
Century Class Trucks Workshop
Manual
for adjustment procedures.
NOTICE
Always make sure the connect-hanger/support
keeps the trailer air hoses and electrical cables
positioned so that they do not rub on anything.
Rubbing may wear through hoses or cables, re-
sulting in air leaks, or exposed or broken wires,
potentially affecting trailer brake or electrical sys-
tems.
7.
After lockup is completed, connect the tractor-to-
trailer air system lines and electrical cable to the
trailer. Take care to prevent dirt or foreign mate-
rial from entering the air lines.
8.
Charge the air brake system with air. Make sure
that the air connections do not leak.
9.
Retract the trailer landing gear and secure the
ratchet handle.
10.
Remove the chocks from the trailer tires.
11.
The load distribution on the front steering axle
and rear drive axle(s) will have a direct effect on
the steering control of the vehicle.
Determine the front and rear axle weights by
weighing the vehicle on scales designed for this
purpose.
The maximum axle weight ratings are shown on
the Federal Motor Vehicle Safety Standard
(FMVSS) label or Canadian Motor Vehicle Safety
1
2
3
4
A
11/07/94
f310106a
1
2
3
4
B
DC
A. Locks open.
B. Locks closed.
C. Kingpin correctly entering the lock. Note how the depressed tongue allows lock halves to close completely around the
neck and shoulder of the kingpin.
D. Kingpin incorrectly entering the lock. Note how the steel tongue prevents lock halves from closing, preventing false
lockup.
1. Fifth Wheel Plate
2. Trailer
3. Kingpin
4. Lockguard
Fig. 10.5, Lockguard Mechanism (rear view)
Fifth Wheels and Trailer Couplings
10.3
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