Sterling Trucks Acterra MX - Manual (Page 70)

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
Acterra ® 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
Acterra ® Workshop 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 moving parts of the fifth wheel are lubri-
cated, apply a liberal coating of grease to the top
plate and the trailer kingpin plate.
Holland
Lubricate all moving parts with a multipurpose chas-
sis grease. Lubricate the two grease fittings located
on either side of the top plate with a multipurpose
chassis grease.
Once the fifth wheel’s moving parts are lubricated,
apply a heavy coat of grease to the top plate by di-
rect application. On slide-mount applications, lubri-
cate the baseplate rails and the plungers for smooth
operation.
31–04 Trailer Electrical
Connector Lubricating
In some cases, failure of trailer cables occurs due to
intrusion of chloride-based road deicing chemicals
into the trailer connector. Once inside the connector,
the chloride-based chemicals corrode the brass ter-
minals and create bridging between positive and
ground terminals.
NOTE: The use of soap is not recommended for
cleaning the electrical connector, as some
soaps may increase the corrosion process.
1. Wash out any existing grease, dirt, and corrosion
on the trailer connectors with electrical contact
cleaner spray.
2. Grease the trailer connector with a lithium-based
dielectric grease.
Frame and Frame Components
31
Acterra Maintenance Manual, October 2008 31/3