freightliner M2 Plus 2023 Manual page 208

Fifth Wheels and Trailer Couplings
B
A
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A. Slide the handle forward to move the front notch
clear of the bracket.
B. Pull the handle completely out.
C. Slide the handle forward to hook the rear notch onto
the bracket.
1. Locking Plate Rear Notch
Fig. 17.11, Unlocking a Holland FWAL
in Fig. 17.4. The kingpin should be in a position
to enter the throat of the locking mechanism.
NOTICE
Attempting to couple at the wrong height may
cause improper coupling, which could result in
damage to the fifth wheel or kingpin.
6. Adjust the trailer height if required.
For a standard fifth wheel plate, the trailer
should contact the fifth wheel approximately 4 to
8 inches (10 to 20 cm) behind the fifth wheel
pivot as shown in Fig.
For a no- or low-lube fifth wheel plate, the fifth
wheel must slide freely under the trailer; the
trailer should contact the fifth wheel at the pivot
point shown in Fig.
7. With the fifth wheel lock opening aligned with the
trailer kingpin, back the tractor slowly toward the
trailer. After sliding under the trailer, stop to
prevent from hitting the kingpin, then resume
backing up slowly until the fifth wheel locks.
On a standard fifth wheel, the fifth wheel must
lift the trailer.
On a no- or low-lube fifth wheel, do not lift the
trailer. Lifting the trailer with a no- or low-lube
fifth wheel may damage the fifth wheel plate.
17.5
1
C
17.5.
17.6.
8. Apply the tractor parking brakes.
A visual inspection is required by law.
Some improper couplings can pass a pull test.
Sound is not reliable.
Get out of the cab and look.
Incorrect coupling could cause the trailer to
disconnect, possibly resulting in serious
personal injury or death.
9. Perform a coupling inspection.
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9.1 Verifying a Holland FW35/31 fifth wheel
is locked:
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Fig. 17.12, No Gap Between Fifth Wheel and Trailer
9.2 Verifying a Holland FWAL is locked:
WARNING
•
Verify that there is no gap between
the bottom of the trailer and the fifth
wheel as shown in Fig. 17.12.
•
Verify that the kingpin is securely
locked as shown in Fig. 17.13.
•
Verify that the nut and washer are
snug against the fifth wheel as
shown in Fig. 17.14.
•
Verify that there is no gap between
the bottom of the trailer and the fifth
wheel as shown in Fig. 17.12.
•
Verify that the kingpin is securely
locked as shown in Fig.17.15.
•
Verify that the handle is fully
retracted as shown in
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Fig. 17.16.