TM 55-1930-203-10
CHAPTER 2
OPERATING INSTRUCTIONS
CAUTION
If equipment fails to operate, refer to troubleshooting procedures in Chapter 3.
Section I. SERVICE UPON RECEIPT OF MATERIEL
2-1.
Inspecting the Equipment
WARNING
Do not load explosive or flammable materials aboard the LARC-LX, energize electrical circuits, fill fuel tanks, or
start engines before firefighting equipment is available and operative.
a. General. The LARC-LX may have come new from the builder, or new or used from storage where it could have
been tampered with or sabotaged. A preoperative check must be made to assure that the equipment and its components
are ready for operation without damage to equipment or personnel;
b. Fire Extinguishers. Check that fire extinguishers are properly stowed and that seals have not been broken.
c. Hull. Inspect all chocks, mooring cleats, towing lugs, jacking pads, lifelines, cab railing, fenders, cargo well
battens, cargo lashings lugs, winch fittings and hull lifting pads for looseness or damage. Make sure that all hatches,
covers, and vents are secure and fit properly. Check that all equipment carried on the LARC is in good condition and
securely attached.
d. Lubrication. Check that the LARC has been thoroughly lubricated. Check oil content of
the engine crankcases,
transmissions, miter boxes, gathering boxes, and marine gears by observing the oil level on their respective dipsticks.
Remove air compressor oil filter plug and check for proper oil level. Refer to the lubrication orders for proper lubricants
and the location of each component.
e. Cooling System. Check to make sure that the radiator compartments and keel coolers are free of debris. Check
that coolant level in each expansion tank is 2 inches below filler neck. If there has been excessive coolant loss from any
of the four cooling systems, report this condition to organizational maintenance.
NOTE
When temperatures drop below 32 . (0 .), it is necessary to protect the cooling systems with antifreeze. Check
F
C
.
with organizational maintenance to make sure that the cooling systems are protected for cold weather
f.
Air System.
(1) Check that the main air supply valves (1, fig. 2-12), above each air tank, are open.
(2) Check main air pressure gage (23, sheet 2, fig. 2-1) for a minimum of 45 psi. Start engines (para 2-29).
NOTE
Starting requires a minimum of 45 p.s.i. in warm weather, and 75 p.s.i. in cold weather.
(3) Open drain valves at bottom of each air supply tank and drain condensation.
NOTE
(4) If air pressure is below 45 p.s.i. and the engines cannot be started, it will be necessary to get air from
another source such as a portable air compressor, another LARC, or from tire pressure. The auxiliary air connection (3,
fig. 2-6) may be
used to
charge the LARC system from an
external source of
air pressure.
(5) For emergency starting, using air from the tires, the following procedure will be used:
(a) Close main air supply valve (fig. 2-12) on both tanks.
(b) Depress and lock valve stem (fig. 2-3) in wheel to be used as air supply.
(c) Open tire air shutoff valve (2, fig. 2-2) at miter box of wheel being used.
(d) Open auxiliary air valve (fig. 3-9) in crossover line from starting air line to tire inflation line. This valve
is located port side forward under number 3 engine on the cargo well bulkhead.
2-1