set, which will normally recover after being un-
coupled for a short period of time.
8.
Check all mounting bolts for signs of fatigue, and
tighten them to the proper torque. For torque
specifications, see
. Inspect all angles,
plates, and brackets for cracks or other damage.
9.
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.
10. After inspecting the fifth wheel, lubricate all mov-
ing parts with a chassis or multipurpose grease.
See
for lubrication instructions.
Jost
1.
Disconnect the tractor from the trailer. For in-
structions, see the
Columbia Driver’s Manual
.
2.
Thoroughly steam clean the fifth wheel.
3.
Check the mounting for missing or damaged fas-
teners, and broken components. Replace or re-
pair as needed.
4.
Inspect the bracket pin bolts. Make sure the lock-
ing tabs are properly securing the bolts in place.
See
5.
Check the fifth wheel for bent, worn, or broken
parts. Replace as needed.
6.
If the fifth wheel is equipped with low-lube plates,
check the plates and replace if damaged or worn
down to the securing bolts. It is normal for out-
side edges of the plate to pucker slightly; this
does not affect performance.
7.
Check the fifth wheel adjustment. Using a lock
tester, lock and unlock the fifth wheel several
times. Make sure that the locking mechanism
works properly.
The lock is properly adjusted if:
the wheel locks
and unlocks easily each time and the lock tester
rotates freely.
The lock is too loose if:
you feel fore-aft play
when pulling and pushing on the lock tester
handle. See
, Ref. A.
The lock is too tight if:
the lock tester does not
rotate freely in the lock. See
, 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
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
f310475
04/11/2011
1
2
3
A
4
5
A. Extended Top Plate Lift Height
1.
Fifth Wheel Top Plate
2.
Fifth Wheel Frame Mount
3.
Frame Rail
4.
Lifting Point
5.
Static Top Plate Height
Fig. 7, Measuring Fifth Wheel Top Plate Lift
09/01/2009
f311101
Fig. 8, Bracket Pin Bolt Locking Tabs
Frame and Frame Components
31
Columbia Maintenance Manual, July 2017
31/5
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