Quantcast Locating Air Leaks in Water/Foam Piping - TM-5-4210-233-14P-1_286

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Teflon Hose - Medium Pressure (with Vacuum Service) - TM-5-4210-233-14P-1_285
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TM-5-4210-233-14P-1 Twin Agent 4x4 Firefighting Truck Model No. CM-KFT-B Manual
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Oil Seals - TM-5-4210-233-14P-1_287
TM 5-4210-233-14&P-1 4-9.  GENERAL MAINTENANCE PROCEDURES -Continued (k) To   prevent   any   contamination   from   new   hose   assembly,   blow   out   hose   assembly   using compressed air. Rinse inside of hose with hot water. Do not allow water temperature to exceed 180 deg. F (82 deg. C). Using compressed air, blow out all water from hose assembly. (I) If  new  hose  assembly  is  not  going  to  be  installed  immediately  after  installing  fittings,  cap  both ends to keep hose clean. f.  Locating Air Leaks in Water/Foam Piping. The following procedure describes a method of locating air leaks. (1) Attach suction caps to all suction ports. (2) Close all discharge and drain valves. (3) Open priming valve and operate primer until vacuum gauge indicates 20 to 22 in (51 to 56 mm) Hg. NOTE If primer fails to draw specified vacuum, prime may be defective or air leaks are too large for primer to handle. (4) Close  primer  valve  and  shut  off  primer.  If  vacuum  drops  more  than  10  in  (25  mm)  Hg  in  10  minutes, serious air leaks are indicated. With engine stopped air leaks are frequently loud enough to be heard. (5) If leaks cannot be heard, apply engine oil to the suspected points and watch for break in oil film or oil being drawn into pump or piping. (6) Connect suction hose to hydrant or auxiliary pump. CAUTION When  testing  for  leaks,  1  00  psi  (689  kPa)  water  pressure  is sufficient. Do not exceed recommended pressures.  Damage to components may result. (7) Open one discharge valve and run in water until pump is completely filled and all air expelled. Close discharge valves, apply pressure to system and watch for leaks. (8) If   the   pump   has   not   been   operated   for   several   weeks,   packings   may   be   dried   out.   Close discharge and drain valves and cap suction ports. Operate primer to build up a strong vacuum in pump, run pump slowly, and apply engine oil to impeller shaft near packing gland. Also be sure packing is adjusted properly. g. 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. h. Gaskets.  Never  reuse  old  gaskets  except  in  an  absolute  emergency.  Always  ensure  correct  gasket  is being used as replacement by fitting dry. 4-157

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