mechanism several times to test. Repeat if nec-
essary. See
Fig. 10.
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-
09/01/2009
f311099
A
B
C
D
E
F
G
H
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. 9, Jost Fifth Wheel Adjustment
09/02/2009
3
1
2
f311100
1. Jam Nut
2. Adjustment Bolt
3. Grease Zerk
Fig. 10, Jost Fifth Wheel
Frame and Frame Components31
Century Class Trucks Maintenance Manual, January 201631/6
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