TM 10-3930-671-24 Tighten  the  advance  piston  hole  plugs  to  the  specified torque (Figure 5.21d). FIGURE 5.21d. STEP 22 Invert the pump and fixture in the vise. Prior to measuring  and  adjusting  the  linkage  gap,  hold  throttle lever  in  wide  open  position  and  rotate  the  drive  shaft  in the   proper   direction   of   rotation   until   a   slight   ’click"   is heard,  as  the  toes  of  the  governor  arm  engage  slots  in the  thrust  sleeve.  The  torque  screw  (if  used)  should  be backed  out.  With  the  throttle  lever  held  in  wide  open position,   use   linkage   gauge   to   check   the   clearance between the rear of the shutoff shaft and the vertical tab on   the   linkage   hook   (refer   to   pump   specifications   for correct   dimension.).   Adjustment   of   this    clearance    is made  by  using  linkage  wrench  to  change  the  effective length  of  the  linkage  hook.  Loosen  the  adjusting  screw and slide linkage to maximum open length. In sert linkage gauge between vertical tab and shutoff shaft, and slide linkage hook together from the rear until face of tab   is   flush   against   gauge.   Tighten   adjusting   screw. Check adjustment and reset if required (Figure 5.22). FIGURE 5.22. F-245