TM 5-3810-231-12
c.
Cleaning and Inspection.
(1) Clean exterior with a cloth dampened
with an approved cleaning solvent and
dry thoroughly.
(2) Inspect for cracks, breaks, and other
damage, refer to par. a above. Repair
or replace a defective controller.
d.
Brush Replacement.
(1) Remove wax seal and screw type cap
from rear of brush holder (fig. 88).
(2) Install new brush and replace cap.
e.
Installation.
Install the controller as
instructed on figure 89.
f.
Testing.
(1) Control in neutral position should
Figure
87.
Crane
removal
and
measure 4 to 14 volts across terminal
installation.
" " to " " (Refer to figure 66),
C
N
depending upon alternator speed. This
149.
Swing Controller
indicates that the residual voltage of the
alternator is present.
a.
Inspection and Adjustment.
(2) Controller full-on (main engine clutch
(1) Remove the cover from the controller
disengaged) measure full-on voltage
and visually inspect main contacts (fig.
from terminal " " to terminal " " If " "
C
N.
C
to " " voltage at full-on controller, and
N
(2) The main contacts will show pitting on
engine at high idle is 7080, this indicates
one face and build up on the mating
that the rectifier and the wiring between
face. Both the arc on interruption and
alternator and rectifier are all right.
the contact erosion are normal.
(3) Controller full-on (main engine clutch
disengaged) measure the ac voltage at
Caution
alternator output terminals G-G2, G2-
G3-G31. This voltage will be slightly
Do not file or dress the main
less than the " " to " " voltage. These
C
N
contracts because of build up of
should be nearly equal, indicating that
material.
the alternator and main rectifier are
functioning properly. The above checks
(3) The contact material is approximately
will be of assistance in localizing the
1/8 inch thick and only when pitting is
trouble.
well into the backing is it necessary to
replace the main contacts.
150.
Control Cabinet
(4) The graphite brush will leave a track of
graphite on the circuit board. To clean,
a.
use a lint-free rag dampened with an
circuit breaker that protects the system against
approved cleaning solvent and remove
overload. Remove cover to reset circuit breaker. The
the carbon deposits.
replaceable plug-in voltage regulator unit can be
(5) The graphite brush must be replaced
checked by removing leads from terminal (A, fig. 66) on
when worn to 1/2 inch in length.
voltage regulator chassis.
b.
Removal.
Remove the controller as
instructed on figure 89.
116
