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Vertical Drilling Motor, Type GE752, GEK–91584D
35
FIG. 20. ARMATURE SHAFT (334B336 CHG. D). E–39091A.
MODELS
SEE TABLE 2
4. Conduct a 500 volt megohmmeter test on the
coils. A reading of 20 megohms or more is ac-
ceptable.
5. See Figs. 21 thru 24 and measure and record
commutating and exciting–coil resistance. Re-
fer to Table 2 to determine the correct connection
diagram for the machine being repaired.
6. High–potential test the field coils to ground.
WARNING: Electric shock can cause serious
injury or death. Strict safety precautions must
be taken and observed by personnel conduct-
ing a high–potential test.
Apply a high–potential test of 2000 volts, 60 Hz for
one minute.
BRUSHHOLDERS
1. Inspect the brushholder for flashover damage,
cracks and burned or pitted areas.
2. Check the brush springs to be sure they move
freely and do not bind.
3. Insert a new brush in the carbonway and move it
up and down in the carbonway to be sure it
moves freely.
REPAIR
LUBRICATION OF BOLTS
The threads and washer faces of bolts and nuts
should be lubricated to obtain maximum clamping force
(at the nominal or at a recommended torque value)
when bolts and nuts are installed at reassembly. Lubri-
cate all bolts.
Use a High Pressure Lubricant such as; graphite in
oil (1 part graphite to 5 parts machine oil by volume), Lu-