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Vertical Drilling Motor, Type GE752, GEK–91584D
73
3. Check winding insulation continuity to ground
with a 500 volt megger. If the megger reading is
less than 2 megohms, the winding should be
baked or dried until the moisture content is suffi-
ciently reduced to raise the megger reading to 2
megohms.
4. An electrical source of heat is best for drying as it
can be easily regulated and is clean. Proceed as
follows:
NOTE: Before drying windings, consideration
must be given to bearings and lubricants. Not
only can bearing lubricants be damaged by
heat, but they can also deteriorate with age. For
this reason, it us usually best to remove bear-
ings before drying and repack with new grease
before reassembly.
a. Remove the armature from the frame and re-
move bearings from the armature shaft.
b. Heat the frame and armature until dried suffi-
ciently to obtain the 2 megohm reading.
c. Pack bearings with new grease. Refer to the
DATA table for the proper grease. Refer to the
appropriate bearing illustration for the proper
amount of grease.
d. Reassemble the motor.
e. If facilities are available, give the reas-
sembled machine a running test to check the
bearings.
Refer to Figs. 48 and 49 for outline drawings.