GE GE752 Megohmmeter Test, Bar±To±Bar Resistance Test, DISASSEMBLY Armature Removal From Frame

GEK±91584D, Vertical Drilling Motor, Type GE752

TABLE 2. DRAWING REFERENCE

Inst.

Bearing Grease

Arm.

Book

Puller Tools

Connection

Coiled

Distribution

Locking

GE752

Longi±

Comm. Pinion

Arm.

Diagram

Frame As-

Drive

Comm.

Arrange-

Model

tudinal

End

End

Shaft

sembly

End

End

ment

Outline

AUP1

Fig. 15

Fig. 16

Fig. 17

Fig. 20

Fig. 22

Fig. 29

Fig. 34

Fig. 38

Fig. 43

Fig. 48

AUP2

Fig. 15

Fig. 16

Fig. 17

±±±

Fig. 22

Fig. 29

Fig. 34

Fig. 38

Fig. 43

Fig. 48

AUP3

Fig. 15

Fig. 16

Fig. 17

±±±

Fig. 22

Fig. 29

Fig. 35

Fig. 38

Fig. 43

Fig. 48

AUP4

Fig. 15

Fig. 16

Fig. 17

±±±

Fig. 22

Fig. 29

Fig.

35

Fig. 38

Fig. 43

Fig. 48

AUP5

Fig. 15

Fig. 16

Fig. 17

±±±

Fig. 22

Fig. 29

Fig.

35

Fig. 39

Fig. 43

Fig. 48

AUT1

Fig. 18

Fig. 16

Fig. 17

±±±

Fig. 24

Fig. 32

Fig. 36

Fig. 38

Fig. 43

Fig. 49

AUT2

Fig. 18

Fig. 16

Fig. 17

±±±

Fig. 24

Fig. 32

Fig. 36

Fig. 39

Fig. 43

Fig. 49

UP1

Fig. 15

Fig. 16

Fig. 17

Fig. 20

Fig. 21

Fig. 30

Fig. 34

Fig. 38

Fig. 43

Fig. 48

UP2

Fig. 15

Fig. 16

Fig. 17

±±±

Fig. 21

Fig. 30

Fig. 34

Fig. 38

Fig. 43

Fig. 48

UP3

Fig. 15

Fig. 16

Fig. 17

±±±

Fig. 21

Fig. 30

Fig.

35

Fig. 38

Fig. 43

Fig. 48

UP3A

Fig. 15

Fig. 16

Fig. 17

±±±

Fig. 21

Fig. 30

Fig.

35

Fig. 38

Fig. 43

Fig. 48

UP4

Fig. 15

Fig. 16

Fig. 17

±±±

Fig. 21

Fig. 30

Fig.

35

Fig. 38

Fig. 43

Fig. 48

UP5

Fig. 15

Fig. 16

Fig. 17

±±±

Fig. 21

Fig. 30

Fig.

35

Fig. 38

Fig. 43

Fig. 48

UP6

Fig. 15

Fig. 16

Fig. 17

±±±

Fig. 21

Fig. 30

Fig.

35

Fig. 39

Fig. 43

Fig. 48

US1

Fig. 18

Fig. 16

Fig. 17

±±±

Fig. 23

Fig. 31

Fig. 36

Fig. 38

Fig. 43

Fig. 49

US2

Fig. 18

Fig. 16

Fig. 17

±±±

Fig. 23

Fig. 31

Fig. 36

Fig. 39

Fig. 43

Fig. 49

Megohmmeter Test

Lift the brushes and perform a megohmmeter test on the armature windings and field coils to determine the condition of the insulation. A reading of less than 2 megohms indicates poor insulation, dirt accumulation or excessive moisture.

Bar±To±Bar Resistance Test

Test for open or short±circuited armature coils.

1.Pass a regulated d±c current through the arma- ture coils.

2.Read the voltage drop between the commutator bars with a millivoltmeter. if the reading varies more than +/± 5% from the average value, a de- fective or short±circuited coil is indicated.

DISASSEMBLY

Armature Removal From Frame

Models UP, AUP

Before turning the machine from horizontal to verti- cal (or vice±versa), attach the armature locking ar- rangement to prevent the armature from moving axially. Remove the armature locking arrangement before op- erating the machine.

See Table 2 to determine the correct armature lock- ing arrangement drawing.

Refer to the longitudinal drawing, Fig. 15, and puller tool drawings, Figs. 16 and 17.

1.Clean the outside of the frame.

2.Remove the hubs from the shaft if not already re- moved.

3.Remove the commutator covers. Disconnect and remove all brushes and brushholders. Wrap

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