The following step is applicable to the
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.
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
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.
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:
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
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:
Tf = Is x Ts where:
Tf = time (in hours) required for finishing charge
Is = starting rate charge (in amperes)
Ts = time (in hours) of starting rate charge to control
If = rate (in amperes) of finishing charge
If the ampere hours discharged are
known, the batteries may be charged
at the finishing rate for such a time as
previously discharged ampere hours.