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Hose Assemblies - Continued
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TM-5-4210-220-12 Truck Firefighting: Powered Pumper: Foam and Water 500-GPM Capacity; Centrifugal Pump Power Takeoff Driven Manual
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FRONT BUMPER - TM-5-4210-220-12_214
TM 5-4210-220-12 4-9    GENERAL MAINTENANCE PROCEDURES - Continued e    Fasteners Replace any bolt, screw, nut, or fitting that has damaged threads.  Inspect tapped holes for damage.  If fitting cannot be retapped with next oversize screw or stud, chasing the threads with proper size tap or die may cure the problem. f    Gaskets Never  reuse  old  gaskets  except  in  an  absolute  emergency.    Always  ensure  correct  gasket  is  being  used  as replacement by fitting dry. g    Oil Seals Install oil seals with lip seal facing the source of oil.  Install by carefully applying an even force on the outer edge of the seal.  If oil seals are to be installed over a keyed or splined shaft, use a guide.  This will prevent the sharp edges of the shaft damaging the lip seal.  Make a guide by cutting and shaping very thin gage sheet metal over the splines.  Make sure the edges are bent slightly inward to prevent these damaging the seal. h    Bearing Installation CAUTION To  prevent  personal  injury  or  premature  bearing  failure  when  removing  or  installing  bearing races,  always exert force on the tight ring of the bearing. To assist in bearing installation procedures it is acceptable to heat or cool bearing races.  Outer bearing  races  can  be  cooled  to  reduce  the  race  diameter.    Place  bearing  in  a  deep  freeze  for about two hours prior to assembly.  It is acceptable to leave bearing in deep freeze for a longer period of time. CAUTION To avoid bearing failure, never heat a bearing using an open flame. Inner   bearing   races   can   be   heated   to   increase   the   race   diameter.      An   electrically-heated-type   oil   bath   is recommended.  Do not allow oil temperature to exceed 275 deg. F (135 deg. C).  The preceding procedure can also be used to help during installation of gears on shafts.  If accessible, shafts may be cooled to reduce outer diameter, and gears may be heated to increase inner diameter. j. Lubrication Lubricate bearings with the type of lubricant normally used before assembly (e.g. gear lube in gear box bearing). This will provide lubrication during first run-in until system lubrication can reach bearings. k    Electrical Items Replace broken, worn or burned electrical wiring with wire of the same carrying capacity.  Always refer to tags and sketches made at removal. m    Testing Test operation of any system after installation or repair.  Inspect for leaks, vibration, noise, misalinement or other problems.  Recheck after a few hours of normal operation. 4-69

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