TM 9-6650-222-35
maintenance personnel are covered in table
6-4. Troubleshooting
6-1. Refer to TM 9-2350-230-12 for trouble-
shooting procedures applicable to operator's
Troubleshooting procedures applicable to
and organizational maintenance personnel.
direct support, general support, and depot
Table 6-1. Troubleshooting, Headrest Assembly 6650-907-9679
Lowest
maintenence
Corrective action
Malfunction
Probable cause
category
1. Headrest will not retain
DS
a. Headrest support 6650-
a. Replace headrest support
position.
is worn.
h. Replace swivel.
Depot
b. Swivel 10513493 (1B, fig.
2. Headrest assembly loose in a. Setscrew 5305-905-3050
DS
a. Tighten or replace setscrew
housing.
applying sealing com-
loose.
pound, MIL-S-11031 to the
threads before tightening
DS
h. Helical compression spring h. Replace helical compres-
a. Tighten or replace exter-
3. Headrest mounting grip
DS
a. Externally threaded ring
nally threaded ring (par:
loose.
is worn or loose.
b. Helical compression spring b. Replace helical compression
DS
4. Housing loose on slide.
DS
Replace helical compression
Helical compression spring
5340-912-2670 (6, fig. 6-12)
is worn or broken.
5. Housing mounting grip
a.. Externally threaded ring
a. Tighten or replace exter-
DS
nally threaded ring
loose.
worn or loose.
h. Helical compression spring b. Replace helical compression
DS
c. Installation.
6-5. Replacement of Headrest Support
(1) Assemble item 15 to item 16 (fig.
6650-908-1984
6-2) and
orient the
mounting hole
a. Removal. Remove items 1, 14, and 15
to engage the plunger, item 13.
b. Inspection Inspect the general condition
small amount of sealing compound
of the headrest support, paying particular at-
ML-S-11031 to the threads.
tention to the condition of the ball joint seat.
Insure that there is no excessive wear in the
knob (IA) to obtain desired fric-
seat and that the seat is not gouged or nicked.
tion setting.
the m o u n t i n g h o l e s that
Inspect
6-6. Repair of Housing Retaining Plunger
engage the plunger for roundness. Inspect the
threads that engage the knob for wear, burrs,
a. Removal. Disassemble items 3 through
or other signs of unserviceability.
6-3