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REPAIR - TM-5-4210-220-34_101
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TM-5-4210-220-34 Truck Firefiighting 1000 GPM Multipurpose Model 2500L Manual
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Carbon Seal and Seating Assembly
TM 5-4210-220-34 2-13. FIRE PUMP - Continued 2-13.4 Impeller. This task covers    Repair TOOLS MATERIALS/PARTS Shop Equipment, Automotive MS178/69 Cotter Pin Maintenance and Repair, NSN 4910-00-754-0705 EQUIPMENT CONDITION Fire Pump Removed from Truck (see TM 5-4210-220-12) Volute Body Removed (see para.  2-13.3) Pump is made of aluminum alloy.    Sealing  surfaces  will  be  damaged  if  pry  bars  or  wedges  are  used  to disassemble components.  When reassembling, do not force components into position or use fastener to bring parts together. REPAIR (1) Measure     the     wearing     diameter     of     the impeller in several places.  If dimension (A) is  less  than  6.975  in.    (177.17  mm)  at  any of  the  several  points  the  impeller  must  be replaced.  If the impeller is to be replaced, it is    recommended    that    the    wearing    ring diameter also be measured.  See para.  2- 13.2 for procedure. (2) Remove   the   cotter   pin   (1),   nut   (2)   and washer (3).  It will be necessary to hold the drive  flange  at  opposite  end  of  pump  shaft (4) while removing nut (2). (3) Remove impeller (5) from splined shaft (4). (4) To  install,  ensure  the  carbon  seal  springs (9) are in place. (5) Carefully slide impeller (5) onto pump shaft (4).  Make sure to aline the roll pin (7) in the impeller with the hole in the spring seat (8). (6) Install   washer    (3)    onto    pump    shaft    (4). Thread nut (2) onto pump shaft and tighten firmly.  Aline slotted nut with shaft hole and install  new  cotter  pin  (1).    Bend  cotter  pin legs over the nut and toward impeller (5). (7) Install  volute  body  as  detailed  in  para.    2- 13.3 preceding. 2-98 (2-99 Blank)

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