TM 9-2320-283-10
Table 3-1. Troubleshooting - Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
SLIDING FIFTH WHEEL AIR CONTROL SYSTEM
6.
FIFTH WHEEL CANNOT BE LOCKED IN DESIRED POSITION WHEN LOCK/
UNLOCK CONTROL IS MOVED TO THE LOCK POSITION. (TRACTOR
COUPLED TO TRAILER).
Step 1.
Check for obstructions (dirt/grease buildup or debris) between
fifth wheel plate and slide track rack.
Clean or remove objects from area as necessary and again
check,
Step 2.
Make sure you have given air cylinder time to react.
Leave LOCK/UNLOCK control in LOCK position, wait for
10 seconds, and again check (refer to paragraph 2-2).
Step 3.
If fifth wheel still will not lock after you have given air cylinder
time to react/lock, fifth wheel may be hung-up between segments
of slide track rack.
Move LOCK/UNLOCK control to UNLOCK position,
apply trailer brake hand control and place gear range
selector in (1) or (R). Move tractor slowly forward or
backward, an inch or two, stop and shift range selector to
NEUTRAL (N). Move fifth wheel control to the LOCK
position and check to see if fifth wheel is now locked.
Release trailer brake hand control.
Step 4.
If fifth wheel still will not lock in position after Test Steps 1.,
2., and 3.. check air line connections at cab mounted control and
at air cylinder under fifth wheel plate. Check for sound of es-
caping air and loose fitting connections.
If you find any leaks in air system connections at control
or air cylinder, notify Organizational Maintenance.
7.
FIFTH WHEEL CANNOT BE UNLOCKED FROM PREVIOUS POSITION WHEN
CONTROL IS MOVED TO THE UNLOCK POSITION. (TRACTOR COUPLED TO
TRAILER).
Step 1.
Check for obstructions (dirt/grease buildup or debris) between
fifth wheel plate and slide track rack.
Clean or remove objects from area as necessary and again
check to see if fifth wheel position can be adjusted.
3-6
