TM 5-3820-205-10-2 17. Operation in Extreme Cold (Below 0° F) a. General.      Special   care   must   be   taken   when operating the jaw crusher in cold weather.  Refer to FM 9-207. b. Lubrication.    Use  the  proper  grade  of  lubricant for all points of lubrication.  Refer to LO 5-3820-205-12- 2. c. Cooling  System.    For  checking  the  antifreeze solution refer to organizational maintenance. Warning Do not smoke or allow any flames or sparks in the vicinity while checking or   filling   the   battery.      The   battery generates hydrogen, a highly explosive gas. Warning Battery acid (electrolyte) is extremely dangerous. Serious injury to personnel  may  result  if  battery  acid contacts skin or eyes. d. Batteries.  A fully charged battery can withstand low   temperatures.      A   partially   charged   battery   may freeze  and  crack  the  cells.    Keep  battery  fully  charged and the electrolyte at X in.  above the plates (para 62). Refer   to   TM   9-6140-200-14.      If   water   is   added   to batteries, run the engine at 1000 rpm for ten minutes. e. Fuel   System.      Keep   the   fuel   tank   filled   to prevent  condensation.    Any  water  in  the  tank  will  be carried to the fuel filter.  Keep the fuel tank cap and vent free  from  moisture  and  ice.    Drain  the  water  from  the fuel  filter  daily  during  extreme  cold  weather  operation (para 56). 18. Operation in Extreme Heat a. Lubrication.  Use the proper grade of lubrication for all lubrication points.  Refer to paragraph 29 and LO 53820-205-12-2 or special lubrication instructions. Warning Cooling system is pressurized. Remove radiator cap slowly and only when engine is cool (below 1200F) or painful burns could result. Caution Do   not   add   cold   coolant   to   a   hot engine  or  engine  may  be  damaged. Allow  engine  to  cool  (below  120°F) before adding coolant. b. Cooling System.  Check the coolant level more frequently  and  keep  the  cooling  system  clean.    Avoid the    use    of    water    containing    alkali,    salt,    or    other substances that would cause rapid formation of scale or rust.  Ensure that the radiator air passages are clean.  If air  passages  are  blocked,  or  obstructions  such  as  dirt, leaves,  or  debris  cannot  be  removed  by  hand,  notify organizational maintenance. If engine becomes overheated,  allow  to  cool  (below  120°F)  before  adding coolant,  and  then  add  coolant  in  small  amounts  as  the engine is running at idle speed. Warning Do not smoke or allow any flames or sparks in the vicinity while checking or   filling   the   battery.      The   battery generates hydrogen, a highly explosive gas. Warning Battery acid (electrolyte) is extremely dangerous. Serious injury to personnel  may  result  if  battery  acid contacts skin or eyes. c.      Batteries.      Water   in   the   batteries   will   evaporate rapidly   at   high   temperatures.      Check   the   batteries frequently.  The electrolyte level should be X in.  above plates (para 62).  Refer to TM 9-6140-200-14. 19. Operation in Dusty or Sandy Areas a. Lubrication. (1) Clean  all  filters  frequently  and  clean  all lubrication points before applying lubricant. (2) Keep  the  outside  of  the  engine  and  the electrical  motors  clean.    Dirt  left  on  the outside    will    eventually    filtrate    into    the motor.  Dirt remaining on the outside can also interfere with proper cooling. (3) Clean area around the lubrication oil filter cap and dipstick level gage before adding or checking the oil. (4) Lubricate  in  accordance  with  LO  5-3820- 20512-2. b. Cooling System. Warning Cooling system is pressurized. Remove radiator cap slowly and only when engine is cool (below 120°F) or painful burns could result. Caution Do   not   add   cold   coolant   to   a   hot engine  or  engine  may  be  damaged. Allow  engine  to  cool  (below  120 °F) before adding coolant. (1) Keep the radiator and fins clean and free of foreign material. (2) Check  the  level  of  coolant  in  the  radiator frequently.        Fill    to    proper    level    with coolant.  Check all hoses and gaskets for leaks (para 59). (3) Check the air cleaner frequently (para 58). 20. Operation Under Rainy or Humid Conditions a. Lubrication.        Lubricate    the    jaw    crusher    in accordance with LO 5-3820-205-12-2. Warning Cooling system is pressurized. Remove radiator cap slowly and only when engine is cool (below 120 F) or painful burns could result. Caution Do   not   add   cold   coolant   to   a   hot engine  or  engine  may  be  damaged. Allow  engine  to  cool  (below  120°F) before adding coolant. b. Cooling System.    The  transfer  of  heat  from  the engine  and  radiator  to  the  atmosphere  is  much  slower under 32