TM  5-6115-584-12 NAVFAC    P-8-622-12 TO-35C2-3-456-1 TM-05682C-12 k.  During  operation,  listen  for  unusual  noises which  may  indicate  a  pending  malfunction. 2-5. 2-7. OPERATING  IN  ALTERNATE  MODES. WARNING When  selecting  position  120V,  1  PH  unit  is f in  2  wire  con  iguration.  A  situation can/may exist in  al lowing a double fault to occur.  To  eliminate  this  possibility  the reconnection  switch  will  be  rewired  by  us- ing  an  AWG  #4  wire  jumper  between  ter- minals #LO and #6 of section g. CAUTION Disconnect load before switching. This unit can be set for 120 volt–l-phase, 120/240   volt–1-phase,   or   120-208 voIt—3-phase  output.  Rotate  reconnection switch  to  desired  output  connection.  Refer to figure 2-2. OPERATION  IN  EXTREME  HEAT. 2-6. a. b. SHUTTING  DOWN  UNIT. Place  AC  circuit  breaker  in  the  OFF  position. To  stop  the  Generator  Set,  place  the  master switch  in  the  OFF  position. c.  After  operation  of  the  Generator  Set,  perform the inspection and service requirements as outlined in preventive  maintenance  checks  and  services  under Operator Maintenance Instructions, Chapter 3. d.  Emergency  Stop.  To  stop  Generator  Set  in  an emergency, pull out DC control circuit breaker (see figure  2-3). e.  If  Generator  Set  is  not  going  to  be  operated  for two weeks or more, disconnect the negative cable from the battery. The generator set will be ready to go upon reconnection  of  the  negative  cable. Section II. OPERATION UNDER UNUSUAL CONDITIONS f. Hold master switch in START position for 2 To  ensure  satisfactory  operation  under  conditions  of extreme  heat,  accomplish  the  following: a. Be sure that nothing obstructs air flow to and from  the  unit. b. Keep cooling fins clean. c. Inspect battery electrolyte level daily. Add distilled  water  if  necessary. d. Keep generator free of dirt and grime. Be sure ventilating  screens  are  free  of  obstructions. 2-8.  OPERATION  IN  EXTREME  COLD  (-25°F, -32°C). To  ensure  satisfactory  operation  under  conditions  of extreme  cold  accomplish  the  following: a. Use correct lubricating oil in engine crankcase for  temperature  conditions.  (Refer  to  figure  3-1). Change oil only when engine is warm. b.  Use  Arctic  Grade  diesel  fuel. c. Keep batteries in a well charged condition. d. Be certain air cleaner intake control is in cold weather   position. e.   Shutter  blades  should  be  fully  closed  for  cold engine open only partially under light load, open more as  load  increases. minutes  after  engine  comes  to  operating  speed. 2-9.  OPERATION  IN  DUSTY  OR  SANDY  AREAS. To ensure that the Generator Set will operate satisfac- torily in dusty or sandy areas, accomplish the following a.  Clean  Generator  Set  frequently. b. Service air cleaner frequently. Check air restric- tion  indicator  daily.  If  red  signal  is  visible,  service  the air cleaner. Be certain that all air cleaner and intake manifold connections do not leak. Be certain oil filler cap fits snugly. c. Change crankcase oil and oil filter frequently. d. Store oil and fuel in dust-free containers. e. Make sure that Generator Set ground connec- tion is free of dust and sand and connections are tight before  starting  the  unit. 2-10.  OPERATION  IN  WET  OR  HUMID  AREAS. To ensure that the Generator Set will operate satisfac- torily  in  wet  or  humid  areas,  accomplish  the  following a. Keep fuel tank full to protect against moisture condensation  and  accumulation. b.  Check  wiring  connectors  for  corrosion  and  wire insulation  for  signs  of  deterioration. 2-6 Change  6