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Page Title: EVAPORATOR AND CONDENSER FAN MOTOR (B2) AND CONDENSER FAN
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TM5-4120-377-14 (2)  Using  screwdriver,  secure  inlet  bell  with  four  screws  and  flat  washers. f.   Fan   installation (1)  Check  that  shaft  key  is  in  place.  If  it  is  taped  in  place,  remove  tape. (2)  Aline  keyway  and  shaft  key  and  slip  fan  down  onto  motor  shaft. (3) Using shims (as required) between fan and shoulder on motor shaft, position fan on shaft so that there is 0.03 to 0.06 inch (0.07 to 0.15 cm) clearance between the fan and the inlet bell. (4)  Using  wrench,  install  lock  nut  on  end  of  shaft.  Lock  nut  should  be  snug  against  fan. (5) Spin fan by hand and check that there is still 0.03 to 0.06 inch (0.07 to 0.15 cm) clearance between fan and  inlet  bell.  Adjust  fan  if  necessary. (6)  Carefully  place  heater  assembly  into  unit  and  aline  mounting  holes. (7)  Insert  bottom  of  each  heater  element  into  retaining  clips. (8)  Using  screwdriver,  secure  heater  assembly  with  two  screws,  lock  washers,  and  flat  washers. Follow-on  procedure:  Install  top  cover.  (See  para  4-28.) 4-63. EVAPORATOR AND CONDENSER FAN MOTOR (B2) AND CONDENSER FAN Preliminary  procedures:  1.  Remove  evaporator  fan  and  evaporator  fan  inlet  bell.  (See  para  4-62.) 2. Remove rear panel. (See para 4-32.) 3.  Remove  conditioned  air  filter.  (See  para  4-33.) Special  tool:  6  inch  (15.2  cm)  long  arm  hex  “L”  type  key  (allen  wrench) Personnel   required:   2 a.   Motor   test   (Installed) (1)  Check  to  see  that  power  has  been  disconnected. (2)  Check  motor  for  rotational  freedom  by  spinning  fan.  If  there  is  any  stiffness  or  binding,  contact  direct support   maintenance. (3)  Check  motor  bearings  for  shaft  end  play.  If  there  is  excessive  end  play,  contact  direct  support maintenance. (4)  Electrically  test  motor  as  follows: l l Disconnect  motor  cable  connector  (P12). Use a multimeter set on lowest OHMS scale to check continuity between pins A and B, A and C, and B  and  C  in  motor  connector  (J12).  If  there  is  no  continuity  between  any  pair  of  pins,  the  motor winding  is  open.  Replace  motor. Use a multimeter set on high OHMS scale to test stator insulation by checking between each pin in connector (A, B, and C) and motor housing. A reading of less than 500,000 ohms indicates insulation failure.  Replace  motor. l 4-117

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