Figure 3-11. Cleaning Air Filter Element Do  not  re-use  element  more  than  twice.  Do not re-use element if it has even the slightest rupture. c.  Installation. (1) Air Cleaner Element. Slide element (4, figure 3-10) over stud in housing (5), install seal (3) on wing nut  (2)  and  secure  element  with  wing  nut  (2).  Hand tighten wing nut. Install seal (9) and dust cap (1). Be certain “Top” on dust cap faces up. Retighten clamp (10) to secure dust cap. 3-19. CONTROL CUBICLE Assembly. a. Inspect (see figure 3-12). (1)  Control  Cubicle  Assembly.  Inspect  cubicle  for dirt,  grease  or  physical  damage  which  might  affect operation of the unit. Loosen three fasteners holding control  panel  to  permit  access  to  the  inside  of  the cubicle.  Check  to  see  that  all  parts  mounted  to  the cubicle   are   secure   and   all   hardware   is   in   place. Check that all instruments and controls operate nor- mally when unit in running. Check for broken or badly insulated  harness  wires  and,  if  necessary,  refer  to higher  level  of  maintenance. (2)  Panel  Light  Assemblies  (DS1  and  DS2).  In- spect panel light assemblies (1) for cracked or miss- TM 5-6115-584-12 NAVFAC  P-8-622-12 TO-35C2-3-456-1 TM-05682C-12 ing  lamp  covers.  Check  that  electrical  connections are clean and tight. (3) panel Light Switch. Operate lamp switch (2) to check that lamps are operable. (4)  Meters.  Battery  Indicator  (M1),  Hourmeter (M2), Frequency Meter (M3), Percent Current Meter (M4) and AC Voltmeter (M5). Inspect meter glass to see  that  it  is  not  cracked.  Check  to  see  the  meter face is clean and readable. Check to see that pointer is  not  bent.  Check  to  see  that  electrical  connection are clean and tight. (5)  DC  Control  Circuit  Breaker  (CB2).  Inspect circuit  breaker  for  physical  damage.  Inspect  electri- cal  connections  to  see  that  they  are  clean  and  tight. Check to see that when button on breaker is pushed in or pulled out, it will remain in that position. (6) Master Rotary Switch (S1). Inspect switch for physical   damage.   Inspect   electrical   connections   to see  that  they  are  clean  and  tight.  Check  to  see  that when placed in the OFF, PRIME & RUN AUX FUEL, or PRIME & RUN positions the switch will remain in position. Check to see that when placed in the PRE- HEAT  position  and  released,  switch  returns  to  OFF position.  With  DC  Control  Circuit  Breaker  (CB2) pulled out (unit will not crank), check to see that when released from START position the switch will auto- matically return to PRIME & RUN position. (7)  Panel  Light  Switch  (S2).  Inspect  switch  for physical  damage.  Inspect  for  clean  and  tight  elec- trical  connections.  Check  to  see  that  switch  will  re- main in both ON and OFF positions. (8) Ammeter - Voltmeter Transfer Switch. Inspect switch for physical damage. Inspect for clean and tight electrical connection. Check to see that switch will re- main in both ON and OFF positions. (9) Voltage Adjust Rheostat (R1). Inspect rheo- stat for physical damage. Inspect for clean and tight electrical   connections.   Note   rheostat   position   and check  that  rheostat  moves  smoothly  thru  its  range. Return rheostat to previously noted position. (10)  AC  Voltage  Regulator  (A2).  Visually  inspect board   and   components   for   signs   of   overheating, cleanliness  and  physical  damage.  Inspect  for  clean and tight connections to the board and that board is securely mounted. (11)  Transformers  (T1  and  T2).  Inspect  trans- formers  for  physical  damage,  cleanliness  and  that electrical connections are clean and tight. (12) Wiring Harness. Inspect wiring harness for physical  damage  such  as  broken  or  frayed  wires  or damaged  insulation. (13) Control Cubicle Box. Inspect box for phys- ical damage. Change  3 3-17