SERVICE MANUAL Remove the brushes (15) and brush springs (14) from  the  brush  holders  and  thrust  washer  (17)  from  the commutator   end   frame   bushing   bore.      Keep   brushes clean and free of grease and oil at all times. Remove  armature  (18)  and  drive  end  housing (3).  See Fig. 10. CLEANING, INSPECTION AND REPAIR The  field  coils,  armature,  and  brushes  may  be wiped  with  a  clean,  dry  cloth.    Compressed  air  may  be used if available. Bushing  equipped  parts  must  not  be  immersed in the cleaning fluid.  These parts should be cleaned with a brush dipped in a good grade of mineral spirits, making certain  that  none  contacts  the  bushings.    The  parking cam,   parking    switch    assembly,    and    gear    and    shaft assembly  may  be  cleaned  in  a  good  grade  of  mineral spirits.  Be  certain  the  mineral  spirits  do  not  contact  the resistor on the parking switch. Thoroughly dry all parts that have been washed. Inspect the armature  for  damage  to  worm  gear, overheated  windings,  condition  of  soldered  connections and  commutator.    If  necessary,  dress  commutator  with number 7/0 sandpaper.  Be certain that the commutator slots are clean. Check brushes for wear.  Replace any brush that is worn down to 5/16", as measured on the short side of the brush, or that has come in contact with grease or oil. When replacing brushes, make certain that solder is not allowed  to  run  up  the  brush  shunt.    Check  for  faulty  or annealed brush springs.  Inspect thrust washer for wear. Check  commutator  end  frame  for  worn  bushing (should   swivel   slightly   in   its   holder),   damaged   brush holders or brush holder insulation plate . Inspect   drive   end   housing   for   worn   armature shaft  bushing  (should  swivel  slightly  in  its  holder),  worn drive   gear   shaft   bushing,   and   damaged   or   worn   set screw.        Check    parking    switch    assembly    for    loose connections,  cracked,  or  damaged  plate,  loose  parking stud,  damaged  resistor  and  dirty  or  misaligned  contact points   (align   top   of   contact   point   spring   flush   with   or slightly below top of contact bracket). Inspect    drive    gear    and    shaft    assembly    for damaged or worn gear teeth, damaged threads on shaft or gear loose on shaft. Check  motor  housing  assembly  for  loose  pole shoe fastening screws, loose pole shoes,  damaged field coil   insulation,   worn   or   frayed   coil   leads   and   loose ground connection. Inspect  and  replace  all  worn  linkage  parts  and spring clips.  Check for worn "D" hole in crank arm.  Use a new drive end cover gasket in reassembling the unit. Test  armature  for  being  grounded  or  having  an open  or  short  circuit.    Test  commutator  end  frame  for leakage between insulated brush holder and ground (use a 110-volt A.C. test lamp). Testmotor housing assembly for continuity in coil leads   or   an   open   circuit   in   field   coils.   Test   field   coil resistance  by  measuring  ampere  draw.    Connect  power supply between yellow coil lead and housing.  See "Field Coil  Draw"  under  "Specifications."  Test  parking  switch assembly for continuity between cable terminal s. REASSEMBLY If coil leads were unsoldered from terminals on p a  r  kin  g  switch  during  disassembly,    thread  the  leads through the hole in the drive end housing (3).  Resolder black or red lead (depending on motor being reassembled)  to  parking  switch  terminal  to  which  both the resistor and contact point spring are connected. The yellow  lead  should  be  soldered  to  the  terminal  at  the opposite end of the resistor. Position drive end housing (3) on motor housing (12).   Insert   armature   (18),   worm   gear   end   first,   into motor   housing   (12).      Insert   thrust   washer   (17)   into commutator  end  frame  bushing  bore.    Both  nylon  and metal   thrust   washers   should   be   assembled   with   the metal disc at the bottom of the bore. Install  brush  springs  (14)  and  brushes  (15)  into brush   holders   (refer   to   "Disassembly"   procedure   for method   of   holding   brushes   in   holders).Brushes   must move freely in brush holders. If  the  coil  lead  has  been  unsoldered,  resolder  it to insulated brush holder and reassemble the commutator  end  frame  (16)  to  the  motor  housing  (12). Insert  thru  bolts  (13).    Tighten  thru  bolts  to  a  torque  of 18-22 in. lbs.  Be certain that the armature retains some end  play  as  bolts  are  tightened.    If  necessary,  back  out the     set     screw     (4)     to     retain     this     end     play     (see "Specifications" for proper end play).  After adjusting the end  play,  be  certain  that  the  set  screw  is  restaked  in place  through  the  staking  hold  located  above  the  lower left  hand  fastening  screw  hole.    Recheck  the  armature end play to be sure it is within specifications. CTS-4056-Chapter II PRINTED IN UNITED STATES AMERICA Page 4