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TM 9- 2920- 224- 34&P
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OPERATIONAL TESTING OF THE GENERATOR
THIS WORK PACKAGE COVERS:
Testing
INITIAL SETUP:
Tools and Special Tools
Tools and Special Tools - Continued
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General mechanic's tool kit (item 1, WP 0017 00)
Relay, reverse current
Test stand, 500A
Regulator, voltage
Or
Test set, generator
Test bench setup consisting of:
Recorder, temperature
Suitable mount or holder for generator
Materials/Parts
28 V dc power source, regulated output
Sealant (item 13, WP 0016 00)
SPST switch, 300 A minimum
Goggles (item 7, WP 0016 00)
Battery, storage, 24V
Rubber gloves (item 8, WP 0016 00)
Fixed resistor, 1.25 ohms 300 A
Equipment Conditions
Fixed resistor, 0.1 ohm 400 A
Generator assembled except for band assembly and
RPM indicator
gasket
Testing
1. Brush Run--In Procedure.
a. Securely mount generator on test bench or stand and connect to brush run--in setup.
CAUTION
Ensure rheostat is never set to infinite resistance.
Generator would reach excessive speed.
b. Set rheostat at minimum resistance.
c.
Close switch; generator shall run as a motor with armature turning counterclockwise when viewed from drive end.
CAUTION
Unusual noise or vibration while generator brushes are
being run in is an indication generator is not in
serviceable condition. Operational testing should be
halted until generator can be disassembled and repaired
d. Increase resistance setting of rheostat until armature is rotating at about 4000 rpm.
e. Allow generator to run at about 4000 rpm for three hours to polish brush seats, then open switch to stop
generator.
f.
Remove any brush from generator and inspect commutator contact surface of brush; polished area shall meet
minimum percentage of brush end surface of 85%.
g. If brush seat polished area does not meet minimum requirements, install brush and repeat steps e and f
except run time shall be one and one--half hours.
h. When brush seat polished area meets minimum requirements, install brush.
i.
Remove, inspect, and install each of the other five brushes, one at a time. Repeat steps g and h, as
applicable, until all brushes are properly polished.
WARNING
Compressed air used for cleaning purposes will not
exceed 30 psi. Use only with effective chip guarding and
personal protective equipment (goggles/shield, gloves,
etc.).
0011 00- 1
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