TM 5-3820-205-10-2 rainy or humid conditions. To prevent overheating, keep the cooling system full, the radiator cap secure, the radiator core free of obstructions, and the fan belt properly adjusted (pare 59). Warning: Do not smoke or allow any names or sparks in the vicinity while checking or filling the battery. The battery generates hydrogen, a highly explosive gas. c. Batteries. Keep the outside of the batteries dry and  free  from  corrosion.  Clean  and  coat  the  terminals and    connectors    with    a    suitable    grease    to    prevent corrosion.    Check    the    insulation    of    the    cables    and jumpers for signs of deterioration, mold, or mildew (figs. 47 and 48). d. Fuel System.  Keep the fuel tank full to prevent condensation. Moisture will accumulate in the air space above   the   fuel   in   the   tank.   Service   the   fuel   filter frequently (pare 56). e. Conveyors and Belts.  A rainy, humid condition causes  material  to  stick  to  conveyors  and  belts.  Keep the scrapers adjusted and the belts as clean as possible. Clean  the  conveyors  and  belts  after  each  operation  to prevent material from drying, caking, and building up on them. f. Exposed   Metal   Surfaces.      Exposure   to   high humidity and rain causes rusting and corrosive action on exposed   metal   surfaces.   Coat   all   unpainted   surfaces with a suitable lubricating oil or grease. g. Protection.    Cover  the  engine,  electric  motors, and controls with a tarpaulin or similar protection during periods   of   non-operation.   Remove   covers   and   open engine  panels  to  allow  unit  to  dry  during  dry  periods before  operation.  Paint  or  coat  with  grease  all  exposed metal surfaces to prevent rusting. Refer to TM 43-0139. 21. Operation in Saltwater Areas a. General.    The    deterioration    and    corrosion    of metal is greatly accelerated in saltwater areas. Keep all exposed  nonpolished  metal  surfaces  painted  (TM  43- 0139).   Coat   all   other   exposed   metal   areas   with   a suitable lubricating oil, grease, or preservative. Lubricate the Jaw crusher in accordance with LO 5-3820-205-12-2. Warning Cooling system is pressurized. Remove radial for cap slowly and only when engine is cool (below 120°F) or painful burns could result. Caution The cooling system is not intended for use with saltwater. However, saltwater may be used in an emergency. Drain, flush, and fill the cooling system with fresh water as soon as possible after having used this expedient. b. Cooling System.  Ensure that the water used in the   cooling   system   is   free   of   salt   or   alkali.   Use   an approved corrosion inhibitor to prevent the formation of rust    or    scale    in    the    cooling    system.    Refer    to    LO 5-3820-205-12-2. c. Fuel System.  Keep the fuel tank full to prevent accumulation  of  salt-laden  moisture  in  the  tank  as  a result of condensation of the air in the space above the fuel.  Service  the  fuel  filter  frequently  (pare  56)  Before each operation, open the fuel tank drain valve (pare 58) and drain about one pint of fuel from fuel tank. This will normally     eliminate     any     water     and     dirt     that     has accumulated in the tank and settled to the bottom while the    equipment    was    idle.    Inspect    the    air    cleaner frequently (pare 57). d. Electrical  System.    Keep  the  electrical  system clean    and    dry.    Wipe    the    equipment    frequently    to eliminate   moisture   and   salt   deposits.   Pay   particular attention to electrical terminals, connectors, and switches (pare 61). 22. Operation in High Altitudes The jaw crusher is designed to operate efficiently at altitudes up to 5000 feet. Above 5000 feet the engine will operate with an increased loss of efficiency as the altitude increases. It is necessary to decrease the amount of fuel injected into the engine to compensate for the lower atmospheric pressure. If the engine is operating erratically, with an apparent loss of power, report this condition to organizational maintenance. Keep the air cleaner and air passages clean and free of obstructions that would restrict the amount of air flowing to the engine. Section IV. OPERATION OF AUXILIARY MATERIEL USED IN CONJUNCTION WITH THE JAW CRUSHER 23. Fire Extinguisher (Carbon Dioxide Type) a   Description.      The   ABC   fire   extinguisher   is suitable for use on electrical and flammable liquid fires. The ABC type is of the 5 lb size. The 5 lb extinguisher is portable. b. Operation.    Remove  the  fire  extinguisher  from its  location,  break  the  seal,  operate  the  control  valve, and direct the stream at the base of the flame. c. Refilling and Maintenance. For detailed information on refilling and maintenance, refer to TB 5- 4200-200-10. 24. Fire Extinguisher (Dry Chemical Type) a. Description. The dry chemical type fire extinguisher is suitable for use on all types of fires and is effective in areas where ambient temperature is -25°F and above. If winterized (pressured by nitrogen), the fire extinguisher- 33