Century Class Trucks Workshop Manual
for repair or
replacement information.
31–04 Trailer Electrical
Connector Lubrication
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.
31–05 Premier 690 Coupling
Inspection
IMPORTANT: Before servicing the Premier cou-
pling, refer to the Premier web site at
for complete safety,
operation, and maintenance instructions.
WARNING
If at any time the 690 coupling is bound up (jack-
knifed), the 294 bolt MUST be replaced immedi-
ately! Do not use the coupling until the bolt has
been replaced. In addition, carefully inspect the
690 coupling, drawbar, drawbar eye, front end as-
sembly, and tail board for damage. Failure to do
so may result in trailer separation from the truck
while in use, resulting in serious personal injury
or property damage.
The time-in-service of the 294 bolt located in the 690
coupling must be monitored, and maintenance per-
formed as follows. See
For a new or replaced 294 bolt:
•
Record the date of installation.
6 months after installation date:
•
Remove the 294 bolt. Using dye penetrate or
magnetic particle testing along the length of the
bolt, inspect for fractures.
•
If the 294 bolt has no damage, install it and
continue to use for another 6 months.
•
If the 294 bolt is fractured, DO NOT USE. Con-
tact Premier Mfg. Co.
1 year after installation date:
•
Regardless of service duty, replace the 294 bolt
with a new one.
1
2
3
f310313a
07/13/2010
4
1.
Linch Pin
2.
Handle
3.
Pintle Hook
4.
294 Bolt
Fig. 14, Premier 690 Trailer Coupling
Frame and Frame Components
31
Century Class Trucks Maintenance Manual, January 2016
31/10
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