TM 5-3810-300-24&P-3
7.1 Battery-Charging Generator
Fig. 3- 30 DN Type 250 A.C. Self-Rectifying Generator (Alternator)
Generator Maintenance
NOTE: If the pulley was not removed, check the
1. Maintain the proper drive belt tension. Replace
retaining nut for proper torque.
worn or frayed belts. Belts should be replaced as a set
when there is more than one belt on the generator drive.
2. Position the generator on the mounting brackets
and start the bolts, with lock washers, through the bolt
2. Lubricate the generator bearings as outlined in the
holes in the generator end frames. If nuts are used,
Lubrication and Preventive Maintenance Chart in
insert the bolts through the bolt holes and then install the
Section 15.1.
lock washers and nuts.
3. Align the threaded hole in the extension ear of the
drive end frame with the slot in the adjusting strap. Start
Remove Generator
the bolt, with the lock washer and plain washer, through
1. Disconnect all of the leads from the generator and
the slot of the adjusting strap and into the threaded hole
tag each one to ensure correct re-installation.
in the generator end frame.
4. Place the drive belts in the grooves of the pulleys.
2. Loosen the generator mounting bolts and nuts and
5. Adjust the generator belt tension as outlined in
the adjusting strap bolt. Then remove the generator
Section 15.1.
drive belts.
6. Attach the wires and cables. Be sure that each one
is correctly installed in accordance with its previous
3. While supporting the generator, remove the
location on the generator. Keep all connections clean
adjusting strap bolt and washers and the mounting bolts.
and tight.
washers and nuts. Then remove the generator.
Polarizing D.C. Generator
4. Remove the pulley assembly if the generator is to
be replaced.
After each check or adjustment of the voltage regulator
or generator, particularly after the leads have been
disconnected and then reconnected, it is necessary to
Install Generator
polarize the D.C. generator before starting the engine.
1. Install the generator drive pulley, if it was removed.
This is to ensure correct polarity with respect to the
Tighten the pulley retaining nut to 50-60 lb-ft torque (Fig.
battery.
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