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 TM 9-2320-360-20-2
14-3. FIFTH WHEEL ADJUSTMENT (CONT)
(3) Install lock tester tool (3) in jaws of fifth
wheel (4) with aid of assistant.
(4) Ensure tab (5) on lock tester tool (3) is on
outside of fifth wheel (4).
(5) Engage lock tester tool (3) by moving
handle (6) counterclockwise until plunger
(7) locks hinged jaw (8).
CAUTION
Hinged jaw must be in fully locked
position with plunger.
Failure to
comply may result in improper
adjustment.
(6) Turn adjustment nut (9) on fifth wheel (4)
clockwise until tight.
(7) Turn adjustment nut (9) on fifth wheel (4)
counterclockwise 1-1/2 turns.
WARNING
Improper adjustment of fifth wheel
may cause trailer to become
uncoupled during operation. Serious
Injury or death may result.
NOTE
Maximum clearance between fifth
locks and kingpin is 0.25 in. (6.4
mm).
If, after adjustment,
distance between marks made in
steps (8) and (9) exceeds 0.25 in.
(6.4 mm), fifth wheel needs to be
repaired.
Notify direct support
maintenance.
If tool does not stay locked in
fifth wheel, repeat steps (2) thru
(5).
(8) Pry lock tester tool (3) forward by moving
handle (6) and mark fifth wheel (4).
(9) Position chained end of pipe (10) on lip of
fifth wheel (4).
Move lock tester (3)
rearward by pulling on pipe (10) and mark
fifth wheel (4).
(10) Remove lock tester tool (3) by pulling out
primary and secondary handles (2 and 1)
and pulling back on pipe (10) with aid of
assistant.
b. Follow-On Maintenance
Remove wheel chocks.
14-6
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