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
Business Class
®
Trucks
Service Manual
.
8. Replace cracked, worn, or damaged parts with
new parts. Replace loose mounting bolts with
5/8-11 SAE grade 8 bolts, grade C nuts, and
hardened washers.
Do not
reuse bolts, nuts, and
washers on fifth wheel mountings.
Holland
Disconnect the tractor from the trailer. For instruc-
tions, see Chapter 10 of the
Business Class
®
Trucks
Driver’s Manual
. Thoroughly steam clean the fifth
wheel, then inspect for:
1. Loose nuts or broken bolts on the fifth wheel as-
sembly.
2. Cracks or wear on the mounting bolts.
3. Improper locking action; cracks or wear on the
jaw locking mechanism.
4. Gouges or wear on the fifth wheel top plate.
5. Fatigued or cracked welds.
6. Replace cracked, worn, or damaged parts with
new parts. Replace loose mounting bolts with
5/8–11 SAE grade 8 bolts, grade C nuts, and
hardened washers.
Do not
reuse bolts, nuts, and
washers on fifth wheel mountings.
7. If you observe any problems doing the previous
steps, correct them immediately. For instructions,
see Group 31 of the
Business Class
®
Trucks
Service Manual
.
31–03 Fifth Wheel Lubricating
Fontaine
Use a multipurpose extreme pressure (EP) chassis
grease, and lubricate all moving parts on the fifth
wheel. When lubricating the top plate at the grease
fittings for the bracket bearing area, tilt the top plate
forward and backward to evenly distribute the
grease. Using a pry tool, separate the jaw and
wedge and lubricate the serrations using a brush to
distribute the grease. On slide-mount applications,
lubricate the slide rail and tapered wedges for
smooth operation.
Once the fifth wheel’s moving parts are lubricated,
apply a liberal coating of grease to the top plate and
the trailer kingpin plate.
Holland
Lubricate all moving parts with oil or a light grease.
Lubricate the fifth wheel top plate with a waterproof
or multipurpose chassis grease.
Once the moving parts of the fifth wheel are lubri-
cated, apply a heavy coat of grease to the top plate
by direct application. On slide-mount applications,
lubricate the baseplate rails and the plungers for
smooth operation.
31–04 Holland Fifth Wheel
Sliding Mechanism
Inspecting
1. Loosen the locking plunger jam nut and turn the
adjusting bolt out (counterclockwise). See Fig. 3.
2. Disengage and engage the locking plungers.
Check that the plungers are securely seated
without binding. If the locking plungers do not
operate properly, see Group 31 of the
Business
Class
®
Trucks Service Manual
for adjustment
procedures.
3. Turn the adjusting bolt in (clockwise) until it con-
tacts the rack. Turn the adjusting bolt an addi-
tional 1/2 turn, then tighten the locking nut se-
curely.
Frame and Frame Components 31
Business Class Trucks Maintenance Manual, December 2002 31/3
To Next Page
Loading...
