3-76. Battery Box
NOTE
Batteries must be fully charged for
a.
Removal.
this test.
(1) Remove batteries (para 3-75).
(c) Read ammeter. Correct reading
(2) Refer to figure 3-57, perform step 3, and
should be from 1.00 to 1.05 ampere.
remove battery box.
(d) When readings do not meet
b.
requirements of (b) and (c) above, generator is
step 3 in reverse order, and install battery box.
defective and must be replaced.
3-77. Generator and Belt (For Engine Model 687C-
(2) Motoring test.
Connect test set as
18-ES)
illustrated in view B of figure 3-59.
(a) Adjust
variable
resistor
to
a.
On Equipment Test of Generator.
maximum resistance.
(1) Field current test. Refer to figure
(b) Close battery switch then gradually
remove shielded cable, and inspection band
from
reduce resistance until armature begins to rotate. It
generator.
should rotate freely.
(a) Use automotive generator
and
(c) When armature falls to rotate
voltage regulator test set as illustrated in view
A of
freely, generator is defective and must be replaced.
(d) Remove test set, install inspection
(b) Adjust variable resistance
until
band, and replace shielded cable.
voltmeter reads 24 volts.
b.
Removal and Installation.
(1) Tag and remove all electrical leads.
(2) Remove capscrew from adjusting
bracket, move generator toward engine block and
remove belt from pulley.
(3) Remove two capscrews, washers and
nuts from generator mounting bracket, then lift
generator from bracket.
(4) Install in reverse order.
c.
Cleaning, Inspection and Repair.
(1) Clean exterior of generator housing with
a rag dampened in an approved cleaning solvent then
dry thoroughly. Blow dust from armature brush area
with low pressure compressed air.
(2) Inspect mounting hardware for worn or
stripped threads, inspect belt for excessive wear, frayed,
or deteriorating condition. Visually inspect housing, end
bells, or pulley for breaks or cracks. Inspect brushes for
wear beyond 50 percent of original length.
(3) Repair by replacing defective mounting
hardware, belt, or worn brushes. Replace a defective
generator.
d.
Brush Replacement. Worn brushes will be
replaced in a manner similar to that described for starter
motor brushes (para. 3-81).
e.
Belt Removal, Installation and Adjustment.
(1) Removal and Installation. Remove belt
as described in b (2) above. Install in reverse order.
(2) Adjustment. Adjust generator belt as
Figure 3-58. Generator and voltage regulator test
shown on figure 3-17.
points.
3-69
