10.
Release the tractor parking brakes.
Test for kingpin lockup by slowly inching the
tractor forward, pulling the trailer against the
chocks.
11.
After lockup is completed, connect the tractor-to-
trailer air system lines and the electrical cable to
the trailer. Take care to prevent dirt or foreign
material from entering the air system lines.
NOTICE
Always make sure the connection hanger keeps
the trailer air hoses and electrical cables
positioned so that they do not rub on anything.
Rubbing may wear through hoses or cables,
resulting in air leaks, or exposed or broken wires,
potentially affecting trailer brake or electrical
systems.
12.
Charge the air brake system with air, checking
that the air connections do not leak.
WARNING
Incorrect fifth wheel lock adjustment could cause
the trailer to disconnect, possibly resulting in
serious personal injury or death.
13.
With the trailer wheels chocked and the brakes
set, check for clearance between the kingpin and
the fifth wheel jaws by moving the tractor forward
and backward against the locked kingpin. If slack
is present, uncouple the trailer and have the fifth
f31135108/24/2021
A
B
A. Verify there is a 1/4 inch (6.35 mm) or less gap.
B. Verify that the locks are completely closed around
the kingpin.
Fig. 17.13, Kingpin Locked in Holland FW35/31 Fifth
Wheel Jaws
f31135008/24/2021
A
A. Verify the nut and washer are snug against the fifth
wheel
Fig. 17.14, Nut and Washer Snug Against Locked
Holland FW35/31
f31140311/12/2021
1
2
1. Lock Completely Closed Around Kingpin
2. Lock Retainer Securing Lock
Fig. 17.15, Holland FW17 or FWAL Lock Closed Around
Kingpin
f31140111/15/2021
1
3
2
1. Handle
2. Locking Plate Rear Notch (behind top of bracket)
3. Locking Plate Front Notch (behind arm of bracket)
Fig. 17.16, Holland FWAL Handle Fully Retracted
Fifth Wheels and Trailer Couplings
17.6
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