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TM-5-4210-220-34 Truck Firefiighting 1000 GPM Multipurpose Model 2500L Manual
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REPAIR - TM-5-4210-220-34_104
TM 5-4210-220-34 2-13. FIRE PUMP - Continued 2-13.5 Carbon Seal and Seating Assembly. This task covers    Repair TOOLS MATERIALS/PARTS Shop Equipment, Automotive UFP 2301 O-ring Maintenance and Repair, UMP 9370 O-ring NSN 4910-00-754-0705 UMP 9413 O-ring EQUIPMENT CONDITION Fire Pump Removed from Truck (see TM 5-4210-220-12) Volute Body Removed (see para. 2-13.3) Impeller Removed (see para.  2-13.4) 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 fasteners to brings parts together. REPAIR NOTE If  water  leakage  is  noticed  dripping  out of   the   drain   hole   in   the   pump   head, carefully    examine    three    O-rings,    and carbon seal. Replace parts as necessary. (1) Pull the carbon seal seating ring (2), sleeve (6) and six springs (1) from pump shaft. (2) Remove and examine carbon seal  (4),  and O-ring (5).  If carbon seal face is scored, it should  be  replaced  along  with  the  seating ring (2).  Replace O-ring (5). (3) To replace the O-ring (9), remove circlip (3) and  seating  ring  (2)  from  the  sleeve  (6). Use  extreme  care  to  avoid  scratching  the face of the seating ring. (4) Remove O-ring (8) from the inside of the sleeve (6).  Replace with new. (5) Install new O-ring (9) onto sleeve (6), followed by seating ring (2).  Lock into position with circlip (3). (6) Install carbon seal (4) and O-ring (5) in pump head seal housing. (7) Install carbon seal on the pump shaft and push fully home. 2-100

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