2-11. OPERATION IN EXTREME HEAT
Operation of the gasoline engine powered model presents a noise hazard to
personnel in the area. The noise level exceeds the allowable limits for un-
protected personnel. Wear ear muffs or earplugs which were fitted by a train-
a. Gasoline Engine. Accumulated dirt on engine reduces heat radiation. Keep the unit clean to avoid
(1) Cooling System. Keep engine cooling fins clean. Keep all exposed surfaces of engine clean.
Remove all obstructions to the flow of air to the engine.
(2) Pumping Unit. Where possible, operate the pumping unit in the shade to avoid overheating. If the
engine overheats, remove the load and idle the engine at 1000 rpm for five minutes. If fuel vapor look
occurs, wait until engine cools.
(3) Engine Operation. For operating procedures, refer to TM 5-2805-257-14, Chapter 2.
b. Electric Motor. Hot, dry periods subject connectors, receptacles, and binding posts to damage from
dust and dirt. If possible, operate electric motor in the shade. Do not remove front panel or chassis com-
ponents unless required. Make more frequent PMCS.
c. Tanks and Hoses. Locate the tanks in the shade, where possible, and wet down tank and hoses with
water to reduce heat.
d. Lubrication. Refer to Lubrication Order, paragraph 31, and lubricate the tank and pump unit,
2-12. OPERATION IN DUSTY OR SANDY AREA
Take advantage of natural barriers
to blowing sand and dust or, if necessary, erect ar-
b. Air Cleaner.
Service the engine air cleaner frequently. (Refer to TM 5-2805-257-14, Chapter 4.)
Filter/Separator Element. Service the filter/separator frequently (figure 3-2).
Drycleaning solvent, P- D-680, used to clean parts Is potentially dangerous to
personnel and property. Avoid repeated and prolonged skin contact. Do not
use near open flame or excessive heat. Flash point of solvent is 100°F to
138°F (38°C to 59°C).