Insert the armature and pulley assembly into the drive end of the field frame (6). Put the commutator-end frame assembly
on the commutator-end. Line up the through-bolt holes. Install the brushes (22). Check the brush spring tension (d (5)
above). Be sure that the brushes are correctly seated and follow the contour of the commutator. Install and tighten the
through-bolts (39) with their lockwashers (40). Fasten the brush leads with the screws (24) and lockwashers (23). Install
the band cover (14).
f. Testing. Mount the generator on a test stand or on the unit if no test stand is available. Connect the field terminal
(fig. 32) to the generator frame with a jumper lead. Connect an ammeter in series with the armature terminal, the
batteries, and the generator frame. Connect a voltmeter across the batteries. Run the generator, increasing the speed to
1, 650 rpm. The -generator output should be 10 amperes at 26 volts. If the generator fails the test, check further
according to d above.
g. Installation. Refer to paragraph 92d.
197. Voltage Regulator
a. Description. The voltage regulator consists of a voltage regulator, current regulator and cutout relay, The voltage
regulator limits the voltage of the electrical system, protecting the batteries, distributor points and other accessories from
excessively high voltage. The current regulator prevents the generator from exceeding its maximum output. The cutout
relay closes the circuit between the generator and batteries when the generator is operating at sufficient speed to charge
the batteries. When the generator slows down or stops, the cutout relay opens the battery to-generator circuit to prevent
discharge of the batteries through the generator. All three of these units are adjustable.
b. Removal. Refer to paragraph 91a.
c. Disassembly (fig. 81).
(1) Never disassemble the regulator unless some part requires replacement. This disturbs the electrical and
mechanical settings and makes it necessary to completely reset the unit.
(2) Remove the cover screws (2) and washers (21), and lift off the cover (1). Remove the relay armature (6) by
unsoldering the lead and removing the screws (9) and lockwashers (8). Remove the current regulator
contact support (4, end unit) by unsoldering the lead and removing the screws (17), lockwasher (19), two
insulating washers (3), two insulators (22), upper contact support, and the other insulating washer (3).
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