GE VERTICAL DRILLING MOTOR GE752 - Manual (Page 8)

GEK–91584D, Vertical Drilling Motor, Type GE752
8
SPECIAL TOOLS
AND EQUIPMENT
CAUTION: This machine is of open splash–proof
construction. It is force–ventilated and requires
an ample supply of cooling air. The cooling air
should not contain combustible gases. If it is
applied in an environment which may contain
combustible gases, an adequate supply of non–
contaminated cooling air must be provided.
The following items are required to maintain, repair
and overhaul the motors:
Part
Megohmmeter (or “Megger”*)
600 volts 111X910 or equivalent . . . . . . . . . . . . . . . .
Voltmeter Simpson Multimeter, Model 260 . . . . . . . . . .
or equivalent
Puller Tools 41E903423G1 . . . . . . . . . . . . . . . . . . . . . . .
Commutator Grinder 427C592G1 . . . . . . . . . . . . . . . . .
Resurfacing Stones:
Medium Grade 8828492P11 . . . . . . . . . . . . . . . . . . .
Finish Grade 8828492P8 . . . . . . . . . . . . . . . . . . . . . .
Brush–Seater Stone (White) 106X98 . . . . . . . . . . .
Lifting Eye P9945894P8 . . . . . . . . . . . . . . . . . . . . . . . . . .
Crows–Foot Pressing Tool 41C685430G1 . . . . . . . . . .
Ball and Socket Tool 41C685080G1 . . . . . . . . . . . . . . .
Guide Pins, Three (3) Recommended
for Armature Asm. In Frame 6717114P1 . . . . . . . .
Spanner Wrench 8843522G1 . . . . . . . . . . . . . . . . . . . . .
Spring Scale (for brush–spring
pressure check) 0–20 lb. capacity . . . . . . . . . . . . . .
Hub Assembly Gauge 41D790941G1 . . . . . . . . . . . . . .
Hub Puller (Less Pump) 41B535703G1 . . . . . . . . . . . .
Pump (For Above) 8843947G1 . . . . . . . . . . . . . . . . . . . .
*Tradename of James G. Biddle Co.
GROUNDING INSTRUCTIONS
Grounding motor frames is required to safeguard
personnel from electric shock in event of an insulation
failure in the machine.
WARNING: Failure to properly ground electrical
equipment may expose personnel to a potentially
hazardous condition in which serious or fatal in-
jury from electrical shock is possible.
Grounding conductors must be provided between
the machine frame and the supporting structure to avoid
hazardous potential difference between the machine
frame and the adjacent surface on which a person may
be standing while touching the machine.
NOTE: This type of ground connection is re-
ferred to in electrical standards as “equipment
grounding” or “enclosure grounding” which is
not to be confused with “system” or “circuit”
grounding. Drilling drive systems normally do
not have intentional circuit ground connec-
tions, except through high impedance detec-
tors.
Grounding conductors must be provided on drilling
units on which the construction of the unit and/or the in-
stallation of the machines do not inherently insure posi-
tive grounding of the equipment. Examples are those
portable (modular) platform rigs and land rigs which do
not already have ground cables to all machinery struc-
tures. Offshore rigs with equipment fastened to the
FIG. 2. DRILLING MOTOR – FRAME GROUNDING
CABLE CONNECTIONS. E–28717.