9.4 The outboard slider assembly requires no
adjustment. If the plungers are loose, in-
spect and replace locking mechanism
parts as needed.
9.5 The inboard slider is adjustable for frame
width and plunger engagement. For ad-
justment, refer to the fifth wheel installa-
tion instructions.
10. Replace cracked, worn, or damaged parts with
new parts. Replace all loose mounting bolts with
5/8–11 SAE grade 8 bolts, grade C locknuts, and
hardened washers. Do not re-use bolts, nuts,
and washers on fifth wheel mountings.
11. After inspecting the fifth wheel, lubricate all mov-
ing parts with a chassis or multipurpose grease.
Apply a generous coating of grease to the top
plate to fill the grooves, or depressions, on the
top plate. See
MOP 31–03 for lubrication instruc-
tions.
31–03 Fifth Wheel Lubrication
To maintain proper fifth wheel operation, always lubri-
cate the fifth wheel after an inspection has been
performed.
IMPORTANT: Lubricate the fifth wheel:
• After power washing, or steam cleaning.
• 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 removal of lubri-
cation from the fifth wheel top plate 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
1. Tilt the top plate forward (the front of the fifth
wheel is down) and apply grease to each bearing
area through the zerk fittings located on each
side of the top plate just to the front of the
bracket pins. Continue to apply grease until it is
coming out of the back of the bearing. It may be
necessary to raise the rear of the fifth wheel with
a pry bar to open up the pocket slightly and
allow the grease to flow through. A substantial
amount of grease may be required initially to fill
the reservoir.
Tilt the fifth wheel ramps down (the rear of the
fifth wheel is down) and repeat the greasing pro-
cedure. Rock the top plate back and forth sev-
eral times to spread the grease over the bearing
surface.
2. Inspect the trailer kingpin plate and top surface
of the fifth wheel to make sure each is properly
greased. A liberal coating of grease should be
applied to the complete surfaces of both the
trailer kingpin plate and the top surface of the
fifth wheel.
09/02/2009
3
1
2
f311100
1. Jam Nut
2. Adjustment Bolt
3. Grease Zerk
Fig. 7, Jost Fifth Wheel
Frame and Frame Components31
108SD and 114SD Maintenance Manual, May 201831/6
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