TM 10-3930-664-10 c. Right Side Transmission Cover. KEY OR CONTROL FUNCTION 1 Air Restriction Indicator Indicates   when   air   cleaner   element   needs   servicing.      Red   signal   flag gradually  fills  the  window  of  indicator  as  air  flow  through  the  air  cleaner decreases  due  to  dirt  clogging  the  filter  element.      When  the  red  signal completely fills the window it is locked in position.  After servicing, indicator is reset by depressing the top of the Indicator. 2 Diagnostic Connector Assembly Connection point for the STE/ICE test equipment. (DCA) Receptacle 3 Transmission Oil Level Dipstick Indicates oil level in the transmission.  Oil level must be between low (L) and high (H) marks with engine idling and transmission oil warm.  Pull dipstick out to remove.  Ensure dipstick is fully seated when reinstalled. 4 Slave Receptacle Permits  charging  of  batteries  or  slave  starting  of  engine  from  an  external power  source.    Also  can  be  used  to  charge  or  start  other  equipment.    +24 Volt DC with negative ground available at this connection. 5 Hourmeter Indicates cumulative number of hours engine has been operated.  Connects to alternator and operates only when alternator is driven by the engine. Records up to 9999.9 hours.   Used to schedule periodic maintenance procedures. 6 Engine Oil Level Dipstick Indicates oil level in the engine.  Oil level must be between ADD  and  FULL marks with engine not running.  Pull dipstick out to remove.  Ensure dipstick is fully seated when reinstalled. 2-13