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Page Title: Cleaning
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TM 5-4210-233-14&P-1 5-66.  APU GENERATOR - Continued (4) Remove all brush springs (9) and lift the AC brushes (10) from their holders (11). (5) Hold both the end bell (12) and frame assembly (13) since they are separate parts, and remove them as one assembly from the adapter (14).  Screwdriver slots in the adapter provide for prying the frame loose.  Be careful not to let the frame assembly rest or drag on the armature. (6) Remove air scroll (15) from adapter (14). (7) Turn armature through-stud nut (16) and washer (17) out to the end of the through stud (18). (8) While pulling the armature (19), outward with one hand, strike a sharp end-wise blow on the nut with a heavy  soft-faced  hammer  to  loosen  the  armature.    If  the  armature  does  not  come  loose,  strike  the armature  with  a  sharp  downward  blow  in  the  center  of  the  lamination  stack  with  a  lead  or  plastic hammer.    Rotate  the  armature  and  repeat.    Be  careful  not  to  hit  the  collector  rings,  commutator, bearing or windings. (9) Upon disassembly, all parts should be wiped clean and visually inspected. b. Cleaning. (1) Clean and inspect all mating surfaces.  Surfaces should be free of nicks and dirt. (2) Clean   mating   area   between   the   generator   shaft   and   the   engine   crank   shaft   with   a   thin   film   of lubricating oil Molycoat (Item 61, Appendix E), or equal. c. Inspection. (1) Brushes.  To examine the brushes, remove the  end  bell  band  and  cover  if  not  already disassembled.    Replace  the  brushes  when they   wear   to   the   Onan   name   and   part number.  At this point there is about 5/8 in. (16 mm) of brush remaining.  If the brush is not  replaced,  the  slip  rings  or  commutator will be damaged.  All brushes must have at least a 50 percent seat.  If they don't, sand as illustrated. (2) Commutator   And   Collector   Rings.      The commutator   must   be   clean   and   in   good condition.  If it is dirty, clean with paper or cloth.        Do    not    use    a    cleaning    solvent because it will destroy the film.  Check the mica between the commutator bars.  If it is above the level of the bars, undercut it. 5-365

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