3-76. Battery Box
Batteries must be fully charged for
should be from 1.00 to 1.05 ampere.
remove battery box.
(d) When readings do not meet
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
On Equipment Test of Generator.
(1) Field current test. Refer to figure
(b) Close battery switch then gradually
remove shielded cable, and inspection band
reduce resistance until armature begins to rotate. It
should rotate freely.
(a) Use automotive generator
(c) When armature falls to rotate
voltage regulator test set as illustrated in view
freely, generator is defective and must be replaced.
(d) Remove test set, install inspection
band, and replace shielded cable.
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.
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
Brush Replacement. Worn brushes will be
replaced in a manner similar to that described for starter
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