freightliner 108SD 2021, Driver Manual

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wheel; see Fig. 7 . Apply a light oil to all moving
parts. For sliding fifth wheels spray diesel fuel on the
slide path of the base plate.
NOTICE
Do not use a power grease gun. The pressure will
damage the lube line.
If the fifth wheel is not equipped with low-lube plates,
apply a lithium-based grease with extreme pressure
(EP) additive to the trailer contact surface of the fifth
wheel.
NOTE: If the fifth wheel is equipped with low-lube
plates, the top plate only requires lubrication at the
new product break-in stage. The low-lube plates re-
quire no further lubrication.
31–04 Trailer Electrical
Connector Protection
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
108SD and 114SD Maintenance Manual, May 2018
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