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Check the drive-axle-flange fasteners (see Fig. 2) for
tightness. Tighten the fasteners as follows:
Tighten 1/2-inch drive-axle stud nuts (with or without
dowels) 75 to 115 lbf·ft (102 to 156 N·m), and tighten
5/8-inch drive-axle stud nuts 150 to 230 lbf·ft (203 to
312 N·m).
31–02 Fifth Wheel Inspecting
WARNING
All fifth wheel maintenance, adjustment, and re-
building must be done only by a qualified me-
chanic. Improper or incomplete procedures could
result in a possible disengagement of the trailer
from the tractor, which could result in personal
injury or property damage.
Parts are under spring compression. Wear safety
goggles while servicing the fifth wheel. Failure to
do so can result in personal injury, due to parts
ejecting with force.
Fontaine
Disconnect the tractor from the trailer. For instruc-
tions, see Chapter 10 of the
Acterra
®
Driver’s
Manual
. Thoroughly steam clean the fifth wheel, then
make the following checks:
1. Look for cracks in the fifth wheel assembly,
mounting brackets, and mounting parts.
2. Check moving parts for wear or damage.
3. Test the safety lock latch for operation.
4. Check for loose nuts and bolts in the fifth wheel
and in the mounting.
5. Check that all springs are securely fastened and
not deformed.
6. Check wedge adjustment.
6.1 Open the kingpin lock and insert a 2-inch
(51-mm) diameter shaft vertically.
6.2 Release the lock by tripping the release
latch at the bottom of the throat.
6.3 Adjust the wedge stop at the end of the
wedge to approximately 1/4-inch (6-mm)
clearance.
7. If you observe any problems doing the previous
steps, correct them immediately. For instructions,
see Group 31 of the
Acterra
®
Workshop Manual
.
f320110a
05/27/93
1
2
2
3
4
5
NOTE: Do not use the three-piece adapter without the
intermediate tube.
1. Nut
2. Adapter
3. Intermediate Tube
4. Inner Metal of Beam
End Bushing
5. Beam Hanger
Fig. 1, Three-Piece Adapter-Type Beam End Connection
06/09/94
f400090b
1
2
NOTE: Spoke wheel shown.
1. Drive-Axle-Flange
Studs and Nuts
2. Drive-Axle Flange
Fig. 2, Drive-Axle Flange
Frame and Frame Components31
Acterra Maintenance Manual, January 200731/2