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(3) Bent lower leg. If bend is not readily apparent, check
to determine whether lower leg centers in collar of
upper
leg,
in
various
positions.
If
bent,
notify
ord-
nance
maintenance
personnel.
(4) Worn gears or bearings.
Notify
ordnance
maintenance
personnel.
(5) B e n t
operating
screw.
Disconnect
connecting
shaft
(par.68b).
Operate  right  leg  with  operating  hand-
crank and left leg with wrench on shaft to determine
whether  either  leg  binds  at  any  point  in  its  travel.
If
bent,
notify
ordnance
maintenance
personnel.
49. Lights
a. General.
In locating the causes of the majority of light-
ing troubles on the semitrailer, the first steps are to deter-
mine whether the inoperative lamp is burned out and whether
an
adequate
supply
of
current
is  reaching  the  lamp  from  the
A tester or test lamp should
source
on
the
towing
vehicle.
be used to isolate the source of the trouble so that corrective
measures can be taken.
b. All Lamps Do Not Light.
(1) Intervehicular cable not properly plugged into recep-
tacles on semitrailer and towing vehicle. Pull
plugs
out of receptacles and reinsert them fully into recep-
tacles.
(2) Light  switch  on  towing  vehicle
not
adjusted
properly.
Check setting of light switch.
(3) No current from towing vehicle. C h e c k c i r c u i t b r e a k e r
and wiring on towing vehicle.
(4) Short  circuit  in  wiring. C h e c k  w i r i n g  f o r  b a r e  s p o t s
in  insulation.  Refer  to  wiring  diagrams  (figs.  24  and
25) .
(5) Dirty or corroded contacts in receptacle or on plug.
Inspect contacts (TM 9-1825E).
(6) Dirty or corroded contacts in semitrailer wiring. I n -
spect  contacts  (TM  9-1825E).
c. One or More Lamps Will Not Light
(1) B u r n e d
out
lamp.
Replace
lamp
(pars.
72-75).
(2) Broken,
grounded,
or
shorted
cable,
or
loose
cable
connection. Check cables for these conditions. Tighten,
repair  or  replace  defective  cables.
Clean  connections.
(3) Damaged  light  assembly. Replace or repair light as-
sembly  (pars.  72-75).
TAGO 1321B
78



 


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