TM 9-6115-604-34
NAVFAC P-8-633-34
4-7. BATTERY CHARGER BC1 ASSEMBLY. Components that were removed by unsoldering may be replaced by
soldering.
a.
Install the silicone diodes (38, Figure 4-2) on the heatsink (37), and install the heatsink on the enclosure rear
panel (7) with the capscrews (36).
b.
Install the transistor (35) on the terminal board (31) with the round head screw (34). Install the zener resistor (33)
on the terminal board (31) with the screw and captive washer assemblies (32). Install the diode (43) and the
zener diode (47) on the terminal board. Install the terminal board (31) on the enclosure rear panel (7) with the
capscrews (30).
c.
Install the bracket (20) on the enclosure rear panel (7) with the hexagon head screw (17).
d.
Install the fixed capacitor (22). Install the cut out relay (21) on the bracket (20) with the hexagonal nut (19) and
lockwasher (1 8).
e.
Install the reactor assembly (29) on the enclosure rear panel (7) with the hexagon head screws (25), hexagonal
nuts (26), lockwashers (27), and flat washers (28).
f.
Install the transformer (24) on the enclosure rear panel (7) with the hexagon head screws (23).
g.
Install the fuse holders (45 and 46). Install the input and output fuses (16 and 15) on the fuse board (14). Install
the fuse board on transformer (24) with the screw (13).
h.
Install the resistor (9) on the enclosure (6) with the hexagon head screws (12). A new resistor (9) must be
adjusted as follows:
(1)
Adjust the float voltage to 5 V dc with the red slider band on the resistor (9). Move the red slider band
toward the green slider band to raise the taper and shutdown point, and move the red slider band away
from the green slider band to lower the taper and shutdown point. Taper and shutdown point should be 23
V dc.
(2)
Adjust the equalizer voltage with the green slider band on the resistor (9). The equalizer voltage may be
adjusted in the same manner as the float voltage.
i.
Install the retaining clip (44). Install the resistor (8) on the enclosure (6) with the hexagon head screws (11) and
flat washers (10).
j.
Install the enclosure (6) on the enclosure rear panel (7) with the hexagon head screws (4) and lockwashers (5).
k.
Install the nameplate (2) with rivets (1), and install the front cover (3) on the enclosure (6), if removed.
l.
Install wiring as tagged. Discard tags.
4-8. INSTALLATION OF BATTERY CHARGER BC1. Install the battery charger BC 1 in accordance with paragraph 4-
20 of the Operator and Organizational Maintenance Manual.
4-9. TESTING OF BATTERY CHARGER BC1. Test battery charger BC 1 in accordance with paragraph 4-20 of the
Operator and Organizational Maintenance Manual.
SECTION Ill. STARTER MOTOR B1 AND B2 REPAIR
4-10. GENERAL. Both starter motors B1 and B2 used on the engine are identical 24 V dc units, and have positive-
engagement drive pinions. Current, supplied to the S terminal on the solenoid switch activates a plunger. The plunger
performs two functions: it moves the shift lever to engage the pinion with the flywheel ring gear teeth, and closes a switch
to supply current to the field coils after the pinion and ring gear teeth have meshed. (The switch will not close on butt
contact of the pinion and ring gear teeth; the teeth must be meshed.) After the engine is started, an overrunning clutch in
the pinion protects the starter motors B1 and B2 from overspeed, and allows the return spring to disengage the pinion
when the starting current is cut off.
4-6
