TM 55-4920-328-13 NOTE The following step is applicable to the general bleeding procedures described  in  the  foregoing.    Specific adjustments are described in step (t). s.      To   change   the   relationship   of   the   relative positions of the master control unit handle and the slave unit  lever,  open  either  valve  A,  (six  turns),  or  B,  (two turns),  and  manually  position  the  handle  and  lever,  as applicable, then close the valve securely. NOTE The  following  step  is  applicable  prior to test of a T74 engine. t.      To   ensure   correct   adjustment   of   the   closed position of the water brake water inlet control valve (15, figure 1-16), proceed as follows: (1) Open valves A and B. (2) Manually move the valve pushrod to the fully closed position. (3) Position the water in master control unit handle  forward  to  the  limit  of  travel,  then  retract  the handle approximately 10 degrees. (4) Close and tighten valves A and B. u.    If  there  is  air  remaining  in  the  servo  loop, repeat the entire procedure. Section III.  BATTERY CHARGING PROCEDURES 6-16.  Scope. Three   methods   of   charging   the   nickel-cadmium batteries  in  the  electric  start  unit  are:    constant  current charging, constant potential charging, and trickle or float charging.  Selection of the method to be used will be at the    discretion    of    maintenance    personnel,    and    will depend     on     the     amount     of     usage;     however,     the recommended method is constant current charging. WARNING The  maximum  peak  discharge  rate  of each     battery     in     the     electric     start system   is   1,050   amperes   at   existing voltage  levels.    The  current  available with the batteries connected in parallel is sufficiently high to cause burns and electrical shock resulting in serious or fatal injury to maintenance personnel. 6-17.  Constant Current Charging. Change  the  batteries,  when  required,  at  battery temperatures  between  40 °F  and  80F,  when  possible. Do not attempt to charge the batteries when the battery temperature exceeds 100°F.  Proceed as follows: WARNING The batteries are shipped in a discharged  state  with  shipping  plugs installed In the fill vents.  At receipt of the   equipment,   remove   the   shipping plugs and install the vent valves prior to  charging.    Failure  to  observe  this precaution   may   result   in   damage   to the equipment. a.      Charge   the   batteries   at   the   starting   rate   i outlined in table 1-3 until the control point is reached. b.  Continue charging the batteries at the specified finishing rate (one-third of the ampere hours charged at the  starting  rate).    Compute  the  time  required  to  finish charging the batteries, using the following formula: T_f = I_s x T_s   where: 3x 1_f T_f = time (in hours) required for finishing charge I_s = starting rate charge (in amperes) T_s  =  time  (in  hours)  of  starting  rate  charge  to  control point I_f = rate (in amperes) of finishing charge NOTE If   the   ampere   hours   discharged   are known,  the  batteries  may  be  charged at the finishing rate for such a time as to provide 140 percent of the previously discharged ampere hours. 6-8