TM 5-3895-374-24-2 SPECIAL INFORMATION JACKETING of the bracket and head provide large chambers at both ends   of   the   pumping   chamber   and   around   the   stuffing   box   for temperature control of the product in the pump. ROTATION:    Viking  pumps  operate  equally  well  in  a  clockwise  or counterclockwise  rotation.    Shaft  rotation  determines  which  port  is suction and which is discharge.  Port in area where pumping elements (gear teeth) come out of mesh is suction port. PRESSURE REUEF VALVES: 1. Pressure  relief  valves  are  standard  on  pumps  with  valve- type heads; they are not available with jacketed type heads. Jacketed relief valves are available for special applications. 2. Pumps  not  furnished  with  a  relief  valve  must  be  provided with  some  means  of  pressure  protection  (inline   pressure relief valve, torque limiting device, etc.). 3. If  pump  rotation  is  to  be  reversed  during  normal  operation, using   same   pump   to   load   and   unload,   then   pressure protection must be provided on both sides of pump. 4. Relief valve adjusting screw cap must always point towards suction side of pump.  If pump rotation is reversed, remove pressure relief valve and turn end for end.  Refer to Figures 1,  2 and 3. 5. Pressure  relief  valves  cannot  be  used  to  control  pump  flow or regulate discharge pressure. For additional information on pressure relief valves, refer to Technical Service Manual TSMOO0 and Engineering Service Bulletin ESB-31. SPECIAL MECHANICAL SEALS:  Can be installed either next to rotor hub or in an altered stuffing box. Extra care should be taken in repair of pumps with mechanical seals. Read and follow all special information supplied with pump. MAINTENANCE Series 225 and 4225 pumps are designed for long, trouble-free service life  under  a  wide  variety  of  application  conditions  with  a  minimum  of maintenance.    The  points  listed  below  will  help  provide  long  service life. LUBRICATION:    External  lubrication  must  be  applied  slowly  with  a hand  gun  to  all  lubrication  fittings  every  500  hours  of  operation  with multi-purpose  grease,  NLGI  #2.    Do  not  over-grease.    Applications involving  very  high  or  low  temperatures  will  require  other  types  of lubrication.    Refer  to  Engineering  Service  Bulletin  ESB-515.    Consult factory with specific lubrication questions. PACKING ADJUSTMENT:  New packed pumps require initial packing adjustment   to   control   leakage   as   packing   "runs   in".      Make   initial adjustments  carefully  and  do  not  over-tighten  packing  gland.    After initial   adjustment,   inspection   will   reveal   need   for   packing   gland adjustment   or   packing   replacement.      Refer   to   instructions   under Disassembly,  page  4,  and  Assembly,  page  5,    regarding  repacking pump. CLEANING  PUMP:     Keep   pump   as   clean   as   possible.      This   will facilitate   inspection,   adjustment   and   repair   work   and   help   prevent overlooking a dirt covered grease fitting. STORAGE:    If  pump  is  to  be  stored,  or  not  used  for  six  months  or more, pump must be drained and a light coat of non-detergent SAE 30 weight oil must be applied to all internal pump parts.  Lubricate fittings and  apply  grease  to  pump  shaft  extension.    Viking  suggests  rotating pump shaft by hand one complete revolution every 30 days to circulate the oil. SUGGESTED REPAIR TOOLS:  The following tools must be available to  properly  repair  Series  225  and  4225  pumps.    These  tools  are  in addition  to  standard  mechanics’  tools  such  as  open  end  wrenches, pliers, screw drivers, etc.  Most of the items can be obtained from an industrial supply house. 1. Lead hammer 2. Allen wrenches (some mechanical seals and set collars) 3. Packing  hooks,  flexible  (packed  pumps)  Small  for  1/4  inch and 5/, 6 inch cross section packing Large for 3/6 inch and up cross section packing 4. Mechanical  seal  installation  sleeve  2-751-002-900  for  1/a inch seal; H & HL 4225 2-751-003-900 for 1/16 inch seal; K LL 4225 5. Bearing   locknut   spanner   wrench   (Source:      #471   J.      H. Williams & Co.  or equal) 6. Spanner wrench, adjustable pin type for use on double end caps (Source:  #482 J.  H.  Williams & Co.  or equal) 7. Brass bar 8. Arbor press page 3-1212