TM 5-4310-362-14
ELECTRIC MOTOR (cont)
LOCATION/ITEM
ACTION
REMARKS
7. Bearings (8 and 9)
If bearings checked out bad be-
fore disassembly (see note at
beginning of para 9-6). Re-
place.
9-8. TEST
NO LOAD CURRENT TEST
(TEST FOR
INTERNAL SHORT)
Preliminary conditions
Motor must be completely as-
sembled and mounted on a
firm surface
If motor is run under load, test readings
Drive belts must be removed
from motor so motor can run
may be high.
without load.
1. Electric power to motor
Disconnect
A good motor will only draw 27 amps
when running, but when the motor is
first turned on it draws a lot more than
its rated current. This initial current
surge can damage the meter movement
if the meter is not turned to a high
enough scale.
2. Ammeter
a. Set on maximum amp scale
(50 amp minimum)
b. Connect to motor as shown.
WARNING
Voltages present in motor
under power can cause
death or injury. Do not
touch any bare wires while
motor is under power.
CAUTION
When hooking up the
multimeter, make sure no
bare wires or test probes
touch any metal surfaces or
shorts may occur.
9-10
