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Vertical Drilling Motor, Type GE752, GEK–91584D
45
MOTOR FRAME FIELD COIL
REPLACEMENT
Refer to Table 2, Page 20, to determine the correct
coiled frame assembly drawing for the machine being
repaired.
Coil Removal
1. Remove terminal insulation and disconnect coil
leads. Use a gas torch or brazing tongs to sepa-
rate brazed connections. When using brazing
tongs use low voltage and high a–c current to
heat coil connections.
WARNING: Safety glasses and leather gloves
must be worn at all times during brazing oper-
ations to protect personnel from physical
harm.
NOTE: If a gas torch is used, coil insulation
must be protected from heat by a non–flam-
mable heat absorbent.
1. Pack absorbent around the insulation near
the connection and over adjacent coils.
2. Make sure all exposed insulation is covered
with a thick layer of absorbent, then heat and
separate the coil connections.
2. Heat the coiled frame in an oven at 150_ C (302_
F) for four hours to soften the varnish so pole
bolts can be removed.
Remove the pole bolts and the coil–pole assem-
bly from the magnet frame.
3. Mark any shims for reassembly with the corre-
sponding pole when the coil(s) is installed in the
frame.
Coil Installation
Procedure for New Coil–Pole Assembly
NOTE: Install any exciting coils and braze their
connections before installing commutating
coils.
1. Before installing any coil and pole, clean the pole
contact surface on the frame and the pole piece
mounting surface.
2. Install the new pole and coil in the frame with any
shims that were on the damaged coil. Use new
washers under bolt heads. Lubricate the bolt
heads, threads and washers and draw the pole
bolts moderately tight.
3. Refer to Table 2, Page 20, to determine the cor-
rect coiled frame assembly drawings. All coil
connections must be brazed with silver solder,
GE–B20A6. Use two pieces of solder (0.010 x 1
in. x 1 in.) between terminal surfaces and braze
terminals as follows: