(2) Disconnect electrical connector (fig.3-
(3) Remove three nuts, washers, and cap-
screws, then remove voltage regulator from mounting
bracket.
(4) Install in reverse order.
3-87. Starter Motor
a. Removal and Installation. Refer to figure 3-77,
remove items (13), (2), and 14 through (18) in numerical
sequence, and starter motor is removed. Install in
reverse order.
b. Cleaning and Inspection.
Figure 3-73. Alternator test connections.
(1) Clean all parts with a rag dampened in an
approved cleaning solution and dry thoroughly. Blow
Note Do not remove voltage
dust from brush area with low pressure compressed air.
regulator except when replacement
(2) Visually inspect mounting hardware for
is required.
wear or stripped threads. Replace defective hardware
or starter motor. Repair by replacing defective brush set
(c below).
and remove items 1 through 4 in numerical sequence to
c. Starter Motor Brush Replacement.
remove voltage regulator. Items 5 through 8 removes
(1) Remove starter motor (a above).
shock mount. Install in reverse order.
(2) Refer to fig. 3-77 and remove items (19)
3-86. Alternator Voltage Regulator (For Engine
and (20).
Model D333TA).
Note.
Remove and replace one
a. General.
The alternator voltage regulator
brush at a time, until set of eight is
senses charge condition of batteries as well as electrical
replaced.
system power demand, and controls alternator output
(3) Refer to figure 3-78, remove screw and
accordingly. As battery charge increases, charging rate
lockwasher from brushholder.
decreases, until batteries are fully charged and ammeter
(4) Remove brush from guide by pulling
will indicate a rate only perceptibly above zero. Since
outward on brush lead.
this regulator is factory adjusted for average operating
(5) Install new brush by first lifting outward on
conditions, it may require adjustment for the particular
brush springs.
ambient temperature in which the engine is operating.
(6) Insert brush into guide, push it down into
b. Test and Adjustment.
contact with commutator, and let spring down on top of
(1) Use voltmeter set on 0 to 50 vdc
brush.
scale, refer to figure 1-10 (7) and connect positive (red)
(7) Seat brush so it has perfect surface
lead of voltmeter to alternator terminal "F1", connect
contact with commutator.
negative lead (black) to ground, then start engine.
Note. rushes can be seated perfectly
(2) Operate alternator at approximately 2,500
by drawing a piece of 00 grade
RPM and read voltmeter. It should read between 27.5
sandpaper between commutator and
and 28.5 volts.
brush and against brushholder.
(3) If reading is not within limits prescribed in
Sand only as much as is necessary
(2) above, remove plug (fig.
to obtain a perfect brush fit. Blow
regulator and use screwdriver to adjust screw within
the sand and carbon dust out of
regulator counterclockwise to reduce voltage, clockwise
starter motor with low pressure
to increase voltage, until reading on voltmeter is correct.
compressed air.
(4) When regulator will -not adjust to
(8) Pull brush outward 1/4 inch and then allow
prescribed reading, regulator is defective and must be
spring to push it back down into guide. Repeat this step
replaced.
as often as necessary to assure brush is free in guide
(5) Stop engine and remove voltmeter.
and will not bind.
(9) Connect brush cable terminal to
Note.
Do not remove regulator
brushholder with screw and lockwasher.
except when replacement is required.
(10) Install remaining brushes by repeating
steps (3) through (9) for each brush.
c. Removal and Installation.
(11) Position inspection band on starter and
(1) Disconnect battery cables and tie back to
secure with two screw and nuts (fig. 3-77).
prevent flash currents.
(12) Refer to figure 3-77 and install starter
3-87
