TM 10-3930-671-24 SECTION 3 DISASSEMBLY Study the manual first. Before commencing disassembly of  the  pump,  cover  inlet  and  outlet   holes,   remove   all external  grease  and  dirt  by  washing  the  unit  with  diesel fuel  and  blowing  it  off  with  filtered  compressed  air.  It must   be   constantly   kept   in   mind   that   dirt,   dust   and foreign   matter   are   the   greatest   enemies   of   the   fuel injection  pump.  As  an  added  precaution  to  prevent  dirt from entering the fuel system while servicing the pump, it is  essential  that  a  clean  work  space,  clean  tools  and clean hands be used. NOTE All  seals  and  gaskets  should  be  discarded  during disassembly.   A   clean   pan   should   be   available   in which  the  parts  may  be  placed  during  disassembly, and a pan of clean diesel fuel or calibrating oil must be available in which the parts may be flushed.  It  is recommended that these be deep pans with rounded comers to lessen the chances of dirt pockets. STEP 1 Remove the pilot tube seal (Figure 3.1). FIGURE 3.1 STEP 2 Mount the pump in a holding fixture. Always use a    fixture    to    avoid    pump    sliding    out    and    becoming damaged,  never  clamp  the  pump  in  a  vise.  Remove  all lead   plumb   sealing   wires.   Unscrew   the   three   cover holddown screws (Figure 3.2a). Remove  the  governor  control  cover  and  cover  gasket (Figure 3.2b). STEP 3 Remove the shutoff cam by rotating the shutoff lever  to  the  wide  open  throttle  (WOT)  position.  Place shutoff  cam  remover,  with  tab  beneath  the  shorter  leg FIGURE  3.2a. FIGURE 3.2b. of  the  shutoff  cam,  on  the  shutoff  shaft  and  pry  gently, sliding   the   cam   off   the   shaft   assembly   (Figure   3.3). Discard the shutoff cam. NOTE Do not reuse this shutoff cam, use new cam. FIGURE 3.3. F-223