freightliner 122SD, Руководство по обслуживанию

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9. Check all springs to see if they are securely fas-
tened, and are not deformed.
WARNING
Do not disassemble the fifth wheel to inspect the
springs. The springs are under extreme pressure,
and could cause serious injury.
10. Check the wedge adjustment.
10.1 Close the fifth wheel on a standard 2-inch
(50-mm) kingpin or similar 2-inch (50-mm)
diameter shaft so that it locks.
10.2 Push on the wedge stop rod with hand
pressure. It should move in 1/4 inch (6
mm) and spring back out on release.
If the free travel is not 1/4 inch (6 mm),
adjust the distance to 1/4 inch (6 mm) by
turning the wedge stop rod, on the right
side of the top plate, clockwise to reduce
the gap and counter-clockwise to in-
crease it.
11. 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.
12. 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.
Jost
1. Disconnect the tractor from the trailer. For in-
structions, see the vehicle Driver’s/Operator’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
Fig. 5 .
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
Fig. 6 , Ref. A.
The lock is too tight if: the lock tester does not
rotate freely in the lock. See Fig. 6 , 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. 7 .
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. 7 .
9. If the fifth wheel is equipped with a sliding
mechanism, inspect and adjust it as follows.
09/01/2009 f311101
Fig. 5, Bracket Pin Bolt Locking Tabs
Frame and Frame Components
31
122SD and Coronado 132 Maintenance Manual, February 2016
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