TM 5-3895-374-24-2 REPLACEMENT OF PARTS DODGE is prepared to repair Screw Conveyor Drive sped reducers for customers who do not have the proper facilities    or    for    those    who    desire    factory     service. However, if the customer has access to an arbor press, equipment for heating and shrinking bearings and gears on shafts, and the tools normally found in a maintenance department,  the  Screw  Conveyor  Drive  speed  reducer can easily be disassembled and reassembled by careful attention to the following instructions. Cleanliness is very important to prevent the introduction  of  dirt  into  the  bearings  and  other  parts  of the  reducer.    The  oil  seals  are  of  the  rubbing  type  and considerable care should be exercised during disassembly   or   reassembly   to   avoid   damage   to   the surfaces  on  which  the  seals  rub.    Any  sharp  edges  on the  input  shaft  or  output  hub  should  be  covered   with adhesive  tape  or  paper  before  performing  any  work  on the unit.  Nicks and burrs on surfaces of the  input  shaft or output hub should be removed . ORDERING PARTS: When ordering parts, specify Screw Conveyor Drive size   and   serial   number,   part   name,   part   number   and quantity. Parts that must be pressed from shafts or output hub should be removed before ordering parts.  This assures that  those  parts,  if  damaged  during  pressing  operation, will be replaced. It  is  recommended  that  when  a   pinion   or   gear   is replaced,   its   mating   gear   or   pinion   be   replaced   also. This  ensures  that  the  gear  teeth  will  mesh  properly.    If the large gear on the output hub must be  replaced,  it  is suggested  that  an  output  hub  assembly,  consisting  of  a gear assembled on an output hub, be ordered to secure an output hub with undamaged surfaces on which the oil seals rub.  However, if the old output hub is to be used, carefully     press     the     gear     and     bearing     cones     off. Thoroughly   examine   the   area   under   the   oil   seals   for scratches    or    any    other    damage    resulting    from    the pressing  operation.    To  prevent  oil  leakage  at  the  oil seals, the rubbing area must be smooth. Replacements    for    the    old    oil    seals    should    be ordered,   due   to   the   probability   of   these   parts   being damaged during disassembly. If  replacing  a  bearing,  output  hub  or  a  shaft,  it  is advisable   to   order   a   set   of   shims   for   adjustment   of bearings on the shaft assembly.  If replacing a housing, a set of shims should be ordered for each shaft assembly because  the  adjustment  of  the  bearings  on  each  shaft assembly is affected. REMOVING  SCREW  CONVEYOR  DRIVE  FROM  THE TROUGH END: WARNING  To ensure that drive is not unexpectedly started, turn off and lock out or tag power source before proceeding.  Failure to observe these precautions could result in bodily injury. WARNING  Equipment being removed may be too heavy to control manually.  Support it by external means.  Failure to observe these precautions could result in bodily injury. Disconnect  any  electrical  power  to  the  drive.    Drain lubricant from reducer.  Uncouple drive shaft and screw. Remove  nuts  from  trough  end  studs.    Support  drive  by means  of  hoist  and  carefully  pull  unit  away  from  trough end to slide drive shaft out of screw. DISASSEMBLY: 1. Remove motor from motor mount.  Remove retainer bolt,  lockwasher  and  shaft  retainer  from  drive  shaft. Pull  drive  shaft  out  of  reducer  from  adapter   side. Remove adapter. 2. Position  reducer  on  its  side  and  remove  all  bolts. Gently tap the output hub and input shaft with a soft hammer (rawhide not lead hammer) to separate the housing   halves.      Open   housing   evenly   to   prevent damage to the parts inside. 3. Lift     shaft,     gear     and     bearing     assemblies     from housing. 4. Remove  seals,  seal  carriers  and  bearing  cups  from housing. 5. Clean  all  parts  in  solvent,  inspect  for  damage  and coat with oil. WARNING:  Solvents can be toxic and/or flammable. Follow manufacturer’s safety procedures and directions.  Failure to observe these precautions could result In bodily injury. REASSEMBLY: 1. Output Hub Assembly:  Heat gear to 3250 to 350°F for shrinking onto output hub.  Heat bearing cones to 2500 to 270°F for shrinking onto output hub. 2. Countershaft   Assembly:      Heat   gear   to   3250   to 350°F   and   bearing   cones   to   2500   to   270°F   for shrinking onto shaft. 3. Input    Shaft    Assembly:      Shaft   and   pinion   are integral.    Heat  bearing  cones  to  2500  to  270°F  for shrinking onto shaft. 4. Drive  the  dowel  pins  back  into  position  in  the  right- hand housing half. 5. Install  countershaft   cover   in   right-handed   housing half.      Place   housing   half   on   blocks   to   allow   for protruding end of output hub.  Install bearing cups in right-hand    housing    half    making    sure    they    are properly seated. 6. Mesh  output  hub  gear  and  small  countershaft  gear together and set in place in housing.  Set input shaft assembly   in   place   in   the   housing.      Make   sure bearing  rollers  (cones)  are  properly  seated  in  their cups.  Set bearing cups for left-hand housing half in place on their rollers. 7. Clean   housing   flange   surfaces   on   both   halves, making   sure   not   to   nick   or   scratch   flange   face. Place a new bead of gasket eliminator on flange face and spread evenly over entire flange leaving no bare spots.  Place other housing half into position and tap with a soft hammer (rawhide not lead hammer) until housing  bolts  can  be  used  or  draw  housing  halves together.    Torque  housing  bolts  per  torque  values listed in Table 4. CAUTION  If too much sealant is used, it will run into the bearing, and too little sealant will result in an ineffective seal. page 3-794