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Page Title: Repair
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TM 5-4210-233-14&P-1 5-75.  APU FUEL TRANSFER PUMP - Continued b. Repair. (1) Transfer  pump  failure  is  usually  due  to  a  leaking  diaphragm,  valve  or  valve  gasket.    A  kit  is available for replacement of these parts.  Because the extent of wear cannot be detected by the eye,  replace  all  parts  in  the  kit.    If  the  diaphragm  is  broken  or  leaks  fuel,  check  for  diluted crankcase oil, replace as required. (2) Occasionally, failure is due to a broken or weak diaphragm spring or wear in the linkage.  In this case, replace the worn parts or install a new pump. c. Assembly. WARNING Dry  cleaning  solvent  P-D-680  is  potentially  dangerous.  Avoid repeated  and  prolonged  breathing  of  vapors  and  skin  contact with the liquid.  Do not use near open flame, arcing equipment or   other   ignition   sources.      Always   wear   eye   protection   and protective  clothing.    The  flash  point  of  P-D-680  is  100  to  138 deg.  F (38 to 59 deg.  C). (1) When installing a new diaphragm, soak it in fuel before assembling.  Insert the diaphragm spring (4) and soaked diaphragm (3) into the pump body (5). (2) If removed, insert the rocker arm link (6) and rocker arm (7) into the body (5) and hook it over the diaphragm pull rod (8).  Align the rocker arm with the rocker arm link pin hole and drive in the pin (9).  The priming lever (1 0) must be in its lowest position, as illustrated, when installing the rocker arm. (3) Compress the rocker spring (11) and install between the body and rocker arm. (4) Insert the valve cages (12), gaskets (13) and valve cover plate (2).  Position the inlet valve (14) with  spring  showing  and  the  outlet  valve  (1  5)  with  spring  in  the  cover  recess  (if  valves  were removed). (5) Assemble  the  cover  to  the  body  (5)  with  notch  marks  lined  up.    Install  the  screws  (1)  but  do  not tighten. CAUTION The  diaphragm  must  be  flexed  or  it  will  deliver  too  much  fuel pressure. (6) Push the rocker arm (7) in full stroke and hold in this position to flex the diaphragm. (7) Tighten the six cover screws alternately and securely, then release the rocker arm. d. Follow-on Maintenance. (1) Install fuel transfer pump (see para 4-216). (2) Using  a  pressure  gauge  or  manometer,  test  pump  for  3-1/4  to  4-1/2  psi  (22.4  to  31  kPa)  outlet pressure. 5-396

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