• If the vehicle operates in harsh conditions such
as salt spray from road surfaces, or in ex-
tremely dusty environments.
• After any service that requires the removal of
lubrication from the fifth wheel head or compo-
nents.
WARNING
Failure to properly lubricate the fifth wheel could
result in a possible disengagement of the trailer
from the tractor, which could result in personal
injury or property damage.
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 on 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.
Castloc II and Simplex Series
Use a chassis or multipurpose grease to lubricate the
two grease fittings located on either side of the fifth
wheel top plate. Lubricate the two grease fittings lo-
cated in the grease grooves on the fifth wheel top
plate. Lubricate the two grease fittings located below
the top plate mounting pins. Lubricate the lock
mechanism.
Once the fifth wheel’s moving parts are lubricated,
apply a heavy coat of grease to the top plate, either
through the grease fittings located on the underside
of the top plate, or by direct application. On slide-
mount applications, lubricate the slider lock pockets
and the slider bracket.
31–03 Frame Fastener Torque
Check
Frame brackets and components secured with Huck-
bolt
®
fasteners do not require a torque check, how-
ever, they should be inspected for damage. Frame
brackets and components secured with conventional
bolts and nuts are to be checked at initial mainte-
nance (IM). See Fig. 6 for pre-EPA07 engine
mounts. Check the torque of frame fasteners to off-
set the effects of "bedding in" (or seating). When
possible, always check the torque of the nut, not the
bolt head. This will give a true torque reading by
eliminating bolt body friction. When checking the
torque of frame fasteners, inspect the frame for
cracks and other damage. Set a click-type torque
wrench to the maximum torque of the fastener you
are checking. Apply pressure until the torque wrench
clicks. Do not loosen the bolt to check the torque.
See the applicable torque table in Group 00 for
torque specifications.
CAUTION
Make sure frame fasteners are properly tightened.
Continued vehicle operation with loose fasteners
could result in bracket or frame damage.
NOTE: Engine supports on vehicles built from
January 2007 do not require checking.
Inspect and check the fasteners at the following
locations:
• Axle Stops
• Engine Trunnion Supports
• Equalizer Brackets
• Exhaust Brackets
• Fifth Wheel Legs
• Fifth Wheel Mountings
• Frame Crossmembers and Gussets
• Front Frame Brackets
Frame and Frame Components 31
Century Class Trucks Maintenance Manual, January 2007 31/5
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