Western Star 47X 2020, Maintenance Manual

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NOTE: Do not use a lube plate (high density
polyethylene) on top of the fifth wheel or on the
kingpin instead of grease. The additional thick-
ness of this material can prevent the fifth wheel
and trailer from experiencing a proper coupling
event. This may also cause damage to the
trailer, kingpin, and/or fifth wheel.
NOTE: Fontaine suggests the use of a Lithium
complex grease such as Mobilgrease XHP 320
or equivalent when applying lubricant to the
locking jaw and wedge.
3. Lubricate the fifth wheel prior to opening and
closing it. Separate the jaw and wedge with a
screwdriver, and grease the full length of their
mating surfaces. Lubricate the top and bottom
contact surfaces of the jaw and wedge. See
Fig. 6 . Open and close the fifth wheel several
times to further distribute the grease.
f311252 04/15/2020
E
C
D
A
F
H
G
B
A. Checking for fore/aft play.
B. Rotating tester in lock.
C. Engage hook.
D. Pull/push handle fore/aft.
E. Check for movement of kingpin in lock.
F.
Disengage hook.
G. Push/pull handle inboard/outboard.
H. Rotate lock tester.
Fig. 4, Jost Fifth Wheel Adjustment
09/02/2009
3
1
2
f311100
1. Jam Nut
2. Adjustment Bolt
3. Grease Zerk
Fig. 5, Jost Fifth Wheel
Frame and Frame Components
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47X and 49X Maintenance Manual, August 2020
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