TM 55-1930-203-10
b.
Service. When cooling system requires refilling, replace coolant as follows:
CAUTION
Do not add cold coolant to an engine with cylinder head temperature exceeding 120 . (49 .).
F
C
(1)
Insure that drain plugs (5, fig. 3-21) on cooling coils (4) are secure.
(2)
Open seat covers (6) from the storage boxes (7) and remove plugs (8) from the bottom of boxes.
(3)
Remove covers on radiator access plates and make sure air vent petcocks in top of radiators (1) are closed.
(4)
Remove pressure caps on expansion tanks ( ).
2
(5)
Fill cooling systems with appropriate coolant to 2 inches below filler neck and replace the pressure caps.
(6)
Start engines and run engines until normal operating temperatures are reached (para 2-27).
(7)
Open air vent petcocks to vent air trapped in top of radiators.
(8)
Close air vent petcocks and replace covers.
(9)
Shut down engines and remove pressure caps.
(10)
Add coolant, if required, to bring coolant level to 2 inches below filler neck.
(11)
Replace pressure caps on ex ansion tanks (2).
p
3-17.Storage Batteries
a. General. The LARC is equipped with two series-connected 12-volt lead acid storage batteries which supply the main
electrical system with 24 volts dc. Multiple conductor cables are used whenever possible. The batteries are located in the port upper
machinery area, aft of engine No. 4. The batteries are negative grounded.
CAUTION
Use distilled water when filling batteries. Under no circumstances will contaminated
water be added to the battery electrolyte solution.
WARNING
If sulfuric acid is to be added to the battery, never pour water into the acid solution. If water is
added to concentrated sulfuric acid, the mixture will spatter and may cause severe acid burns. Pour
the sulfuric acid slowly into the water, stirring gently and constantly. Always wear goggles, a
rubber apron, and rubber gloves when handling sulfuric acid.
b. Service. Fill all cells having a low fluid level with distilled water, Federal Specification O-W-41. Water added to the battery
cells should just reach the bottom of the cell covers.
3-18.Fire Extinguishers
Inspect the fire extinguishers daily for evidence of tampering or possible discharge, and for broken seals.
Report defects to
organizational maintenance immediately.
3-19.Trouble Light
a. General. The LARC is equipped with two spot and trouble lights, one in the cab and one in the forward starboard wing
compartment.
b. Inspection., Inspect the trouble lights daily for malfunction or damage. Report defects to organizational maintenance.
3-20.Radio
a. General.
The LARC is
equipped with a
radio receiver-transmitter and intercommunication system (fig. 3-22). The radio
and intercom system is operated off the 24volt electrical system of the LARC. A radio antenna (3) is mounted on the cab roof. The
AN/VRC-46 radio receiver-transmitter (1) is mounted beside the operator's seat, and the audio frequency amplifier (2) is mounted on
the port side of the operator's cab below the aft window. There are five AN/VRC-1 intercom controls, one in the operator's cab (5),
one in each forward wing compartment (1, fig. 3-23) and one in each engine compartment (1, fig. 3-24). For AN/VRC-46 radio
operating instructions, refer to TM 11-5820-401-10. For AN/VRC-1 intercom operating instructions, refer to TM 11-5830-340-12.
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