ARMY  TM  9-6115-645-10 AIR  FORCE  TO  35C2-3-444-11 MARINE CORPS TM 09244A/09245A-10/1 SECTION  III. MAINTENANCE PROCEDURES 3-3  GENERATOR  SET  INSPECTION AND SERVICE. 3-3.1  Introduction. This section  contains  operator maintenance  procedures. Deficiencies  noted  during inspection which are beyond the maintenance scope of the operator shall be reported to next higher maintenance level. 3-3.2  Batteries. Battery acid can cause burns to unprotected skin. WARNING Batteries give off flammable  gas. Do not smoke or use open flame  when  performing maintenance. Flames and  explosion  could result in personal injury or death. 3-3.2.1 Inspection. a. Shut  down  generator set,    refer to paragraph 2-9.2. b. Open battery access door. c. Inspect  for  damaged battery case, corrosion,    or damaged and  loose  connections on terminal cable, and damaged or missing battery caps. WARNING Batteries  give  off flammable gas. Do not smoke or use open flame  when  performing maintenance. Flames and explosion could result in personal injury or death. d. Remove battery caps. CAUTION Electrolyte  level  must cover  battery  plates in all cells. Failure to observe this caution can cause damage to the battery. NOTE Electrolyte  level should be at bottom of each cap cylinder. e.  Inspect electrolyte level. f.  Perform service procedures  if required. g.  Install battery caps. h.  Close battery access door. 3-3.2.2 Service. a. Shut  down  generator set,    refer to paragraph  2-9.2. 3-11