(1) Remove valve cap from any wheel valve
stem on Axles No. 3 through No. 5.
(2) Using tire gage, deflate any one tire on
Axles No. 3 through No. 5 to 40 psi (276
(3) Start engine (TM 9-2320-364-10).
(4) Set CTIS controller selector to
(5) Press CTIS START button.
(6) Check CTIS air line 2994 for damage,
crimps or leaks (see schematic Fig
(a) If air line 2994 is damaged, crimped
or leaking; perform Steps (7) and (8)
below, and tighten fittings, replace
air line (Para 12-36 and see
schematic Fig 2-49).
(b) If there are no leaks, crimps or
damage; air line 2994 and fittings
(7) Turn OFF ENGINE switch.
(8) Install valve cap on wheel valve stem.
Excessive inflation times with out a low air
light are caused by minor leaks in CTIS
CTIS air lines are pressurized only when
CTIS is in inflate, deflate or test cycles.
Excessive inflation times, sometimes
accompanied by low air light is normal
if engine is at idle speed and/or air operated
accessories are being used.
CTIS initially and periodically checks for
system air leaks. CTIS controller will display
a flashing LOW AIR light and will shut off if
about 6 psi cannot be maintained.
Wear safety goggles when performing leakage tests on valves. Failure to do so may result in serious
eye injury due to high pressure air.
Exercise extreme caution when working
around wheels or under truck while engine
is operating. Movement of truck may cause
injury or death to personnel.