TM 5-3895-374-24-2 TECHNICAL SERVICE MANUAL SECTION TSM000 INSTALLATION, START UP, TROUBLESHOOTING, PAGE  1 VIKING PREVENTATIVE MAINTENANCE, DO’S & DON’TS ISSUE  C PUMP Suggested  Reference:    Hydraulic  Institute  Handbook,  14th Edition. INSTALLATION General Before  installation  is  started  a  few  items  of  a  general  nature should be considered. 1. Location   -   always   locate   the   pump    as    close    as possible to the supply of liquid to be pumped.  Locate it  below  the  liquid  supply  if  at  all  practical.    Viking pumps   are   self   priming   but   the   better   the   suction conditions the better the performance. 2. Accessibility - the pump should be located where it is accessible  for  inspection,  maintenance,   and   repair. For large pumps, allow room to remove the rotor and shaft without removing the pump from the base. 3. Port  Arrangement  -  since  the  pumps  have  different port   arrangements   depending   on   the   model,   port location    should    be    checked    before    starting    the installation.  The ports may be upright, opposite or at right  angles  to  each  other,  see  Figure  1.    The  right angle   ports   are   normally   right-hand,   see   Figure   2; some models are available with left-hand arrangements;   still   other   models   are   available   with the   right   angle   ports   located   in   any   one   of   eight positions including righthand and left-hand. FIGURE 1 FIGURE 2 4. Suction/Discharge    -    shaft    rotation    will    determine which port is suction and which discharge.  A look at Figure 3 will show how rotation determines which port is which; as the pumping elements (gears) come out of mesh, point "A" on Figure 3, liquid is drawn into the suction port; as the gears come into mesh, point "B", the liquid is forced out the discharge port.  Reversing the   rotation   reverses   the   flow   through   the   pump. When   determining   shaft   rotation,   always   look   from the shaft end of the pump.  Unless otherwise specified, rotation is assumed to be clockwise (CW), which makes the suction port on the right side of the pump.      The   idler   pin,   which   is   offset   in   the   pump head,  should  be  properly  positioned  toward  and  an equal distance between the port connections. FIGURE 3 5. Pressure Relief Valve - the Viking pump is a positive displacement pump.  This means that when the pump is  rotated,  liquid  will  be  delivered  to   the   discharge side of the pump.  If there is no place for this liquid to go - discharge line is blocked or closed -the pressure will build up until the motor stalls, the drive equipment fails,  a  pump  part  breaks  or  ruptures,  or  the  piping bursts.  To prevent the possibility of any one or more of  these   things   happening   in   case   of   unintentional closing  of  the  discharge  line,  the  use  of  a  pressure relief valve is recommended.  A pressure relief valve will  relieve  the  pressure  at  a   predetermined   value, thus protecting the entire system. CUT-AWAY OF VIKING INTERNAL PRESSURE REUEF VALVE FIGURE 4 The  pressure  relief  valve  mounted  on  Viking  pumps and   most   in-line   valves   are   of   the   spring   loaded poppet  design.    See  Figure  4.    The  spring  (A)  holds poppet (B) against the seat in the valve body (C) with a  given  force  determined  by  the  spring  size  and  by how tightly it is compressed by the VIKING PUMP, INC. • A Unit of IDEX Corporation • Cedar Falls Iowa 50613 U S A Page 3 - 1202