Western Star 47X 2020, Maintenance Manual

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The lock is too loose if: you feel fore-aft play
when pulling and pushing on the lock tester
handle. See
Fig. 4 , Ref. A.
The lock is too tight if: the lock tester does not
rotate freely in the lock. See Fig. 4 , Ref. B.
8. If the lock is improperly adjusted, correct as fol-
lows.
If the lock is too tight, loosen the jam nut, turn
the adjustment bolt clockwise one full turn, then
reset the jam nut. Lock and unlock the mecha-
nism several times to test. Repeat if necessary.
See
Fig. 5 .
If the lock is too loose, loosen the jam nut, turn
the adjustment bolt counterclockwise one full
turn, then reset the jam nut. Lock and unlock the
mechanism several times to test. Repeat if nec-
essary. See
Fig. 5 .
9. If the fifth wheel is equipped with a sliding
mechanism, inspect and adjust it as follows.
9.1 Check the bracket for any cracks or miss-
ing and damaged parts.
9.2 Inspect the locking plungers for full en-
gagement.
9.3 Check the locking mechanism for proper
operation.
If the plungers will not release, check the
air cylinder or plunger adjustment.
If the plungers are loose, check the
plunger adjustment and the plunger
springs for proper compression. Replace
if needed.
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 31–02 in this manual for lu-
brication instructions.
31–02 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-
cant from the fifth wheel head or components.
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.
Frame and Frame Components
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47X and 49X Maintenance Manual, August 2020
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