Biddle MEGGER - Page 8

To Remove the Motor and Drive by Hand
First, remove the four screws which hold the motor bracket
to the instrument case, thus detaching the bracket and motor
as a unit. The flexible coupling will remain attached to the
motor shaft. (In older models the coupling must be de-
tached.)
CAUTION: Rotate this shaft only in a counterclockwise di-
rection when facing the crank end of the instrument. If forced
in the opposite direction, a pin will be sheared in the hand-
cranked gear train.
Second, unfold the crank handle and the instrument is ready
for hand operation.
Lubrication: Instruments supplied prior to April, 1947,
require occasional oiling or greasing. Insert a few drops of
best grade light oil in the hole or holes provided for the purpose
on the top of the instrument. Some older instruments also have
grease cups. Present models have permanently lubricated ball
bearings and require no oiling.
Motors with wool-packed sleeve bearings are oiled at the
factory for one year’s normal service. Reoil once a year, or
every 2,000 operating hours, whichever occurs first. The
amount of oil added should vary from 30 drops for three-inch
diameter motors to 100 drops for nine-inch diameter motors.
Use preferably Electric Motor Oil or, in emergency, SAE-10
automotive oil. Do not use oils recommended for cleaning or
rust prevention.
Motors having ball bearings are packed with sufficient grease
tor approximately 10,000 operating hours. Once a year remove
the oil screws and add five to ten drops of a good grade Electric
Motor Oil or SAE-10 automotive oil to each bearing. After
five years or 10,000 operating hours (whichever occurs first),
the bearings and housings should be cleaned thoroughly and
regreased with best grade ball bearing grease. Care must be
taken to keep dirt out of the bearings and the grease.
C61