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Vertical Drilling Motor Model GEB20 Doc No. GEK-91694, Rev. C

GE Confid entia l a nd Proprie tary In form atio n

GEK-91694C

© 2007 General Electric Company. All rights reserved. This publication contains proprietary information that has been identified as “GE Restricted” and intended for GE internal use only.

Distribution of this publication and the information contained herein is limited to authorized GE employees, and any distribution or disclosure outside GE is strictly prohibited absent written consent from GE management.

If you are not an authorized recipient of this publication, you are hereby notified that any perusal, use, distribution, copying or disclosure is strictly prohibited. If you have received this publication in error, please immediately return to GE at the following address: GE Transportation, Technical Publications Department, Building 14, 2901 East Lake Rd., Erie, PA 16531.

GE Confid entia l a nd Proprie tary In form

GEK–91694C

VERTICAL DRILLING MOTOR

MODEL GEB20

CONTENTS

INTRODUCTION 1

ATEX CERTIFICATION 1

INSTRUCTIONS 1

5GEB20 2

DESCRIPTION 3

DATA 4

TORQUE VALUES 5

SPECIAL TOOLS AND EQUIPMENT 5

GROUNDING INSTRUCTIONS 6

GROUNDING PROCEDURES 6

LUBRICATION 6

INSPECTION 7

MONTHLY 7

CLEANING 7

LOCKING THE ROTOR FOR SHIPMENT 8

SHIPPING 9

HANDLING 9

CLEANING AND SLUSHING 9

SKIDDING 9

PROTECTION 9

STORAGE 9

PLACING INTO STORAGE 9

REMOVING FROM STORAGE 10

OVERHAUL 13

CLEANING 13

DEFECT RECORDS 13

VISUAL INSPECTION 13

STATIC ELECTRICAL TESTS 13

MEGOHMMETER (“MEGGER”) TESTS 13

HIGH–POTENTIAL (“HI–POT”) TESTS 14

HUB REMOVAL 14

ROTOR DISASSEMBLY PROCEDURES 14

ROTOR REMOVAL 14

BEARING ASSEMBLIES REMOVAL 15

ROTOR SHAFT INSPECTION 16

STATOR COILS AND BUS RINGS 16

CONNECTION–END FRAME HEAD REMOVAL 16

CLEANING AND INSPECTION 16

STRIPPING INSULATED CONNECTIONS 17

CONNECTION–END FRAME HEAD INSTALLA-

TION 17

ROTOR ASSEMBLY PROCEDURES 17

ROTOR BALANCING 17

ROTOR BEARING ASSEMBLIES 18

ROTOR INSTALLATION INTO FRAME 21

ROTOR BEARING ASSEMBLIES CHECKS 22. . .

ROTOR SHAFT END–PLAY CHECK 22

FINAL ASSEMBLY OF ROTOR DRIVE–END 22. .

FINAL ASSEMBLY OF ROTOR CONNECTION–

END 23

CABLE LEADS AND CONNECTIONS 23

INSPECTION 23

CABLE TERMINAL REPLACEMENT 23

COVERS 24

ELECTRICAL RUNNING TEST 25

HUB MOUNTING 25

INTRODUCTION

This publication provides basic instructions for gen-eral preventive maintenance, i.e., inspection and lu-brication of the Model 5GEB20 drilling motor.

ATEX CERTIFICATION

INSTRUCTIONS

WARNING: Installation should be in accordance with the instruction as defined in EN 60079–14:1997 “Electrical apparatus for explo-sive gas atmospheres, Part 14. Electrical installa-tions in hazardous areas (other than mines)”.

Couplings, belts and chain guards should be installed as needed to protect against accidental contact with moving parts. Machines accessible to the public should be further guarded by screening, guard rails, etc., to prevent the public from coming in contact with the equipment. Fail-ure to observe these precautions may result in personal injury.

Revisions are indicated by margin bars.

These instructions do not purport to cover all details or variations in equipment nor to provide for every possible contingency to be met in connection with installation, operation, or mainte-nance. Should further information be desired or should particular problems arise which are not covered sufficiently for the user’s purposes, the matter should be referred to the General Electric Company. Any applicable Federal, State or local regulations or company safety or operating rules must take precedence over any instructions given in this material. GE has no obligation to keep the material up to date after the original publication.

THERE ARE NO WARRANTIES OF ACCURACY, MERCHANTABILITY OR FITNESS FOR PARTICULAR PURPOSE.

Verify numbers for parts, tools, or material by using the Renewal Parts or Tool Catalogs, or contact your General Electric representative for assistance.

Do not order from this publication.

�Copyright 1997, 1998, 1999, 2002 General Electric Company. All rights reserved. This copyrighted document may be reproduced free of charge by General Electric Company customers (OEM’s) and their customers, if such reproduction is used exclusively in connection with equipment used in those customers’ internal operations.

GE Confid entia l a nd Proprie tary In form

GEK–91694C, Vertical Drilling Motor, Type GEB20

FIG. 1. 5GEB20 VERTICAL DRILLING

MOTOR. E-43082.

1. This machine is suitable for operation in typical oil well drilling industry rig environments including offshore platforms and mobile drilling units. For other types of applications and environments, please contact your GE representative to determine suitability.

2. Periodic lubrication is required on all 5GEB20 vertical drilling motors between scheduled over-haul periods. Every six months or 2500 hours, apply approximately 2 oz. of grease (D6A2C10, Cyprina RA) to both bearings. See Fig. 6 for lu-brication locations. Motor bearings MUST be re-placed after 25,000 hours of operation which is 90 percent of calculated bearing life. This is in ac-cordance with the requirements of EN 13463–5:2000. All maintenance must be carried out in accordance with:

EN 60019–17:1997 – Electrical apparatus for explosive gas atmospheres, Part 17. Inspection and maintenance of electrical installations in hazardous areas (other than mines);

IEC 60079–19:1993 – Electrical apparatus for explosive gas atmospheres, Part 19. Repair and overhaul for apparatus used in explosive atmo-spheres (other than mines or explosives).

FIG. 2. SAFE ELECTRICAL PARAMETERS

FOR 5GEB20. E-45043.

3. Figure 2 defines the safe electrical parameters and Figure 3 defines the safe environmental pa-rameters for the 5GEB20. The motor may be op-erated in the presence of typical vibration levels encountered on land and offshore drilling rigs.

GEB20

1. The cable fitted to the equipment must be capa-ble of withstanding maximum temperatures of 108.5� C at the cable entry point.

2. The equipment must be supplied continuously with at least 2800 CFM of cooling air. The cooling arrangements must be suitable for the area in which it is installed. When fitted to the equip-ment, the cooling arrangements must ensure that the equipment satisfies a degree of protec-tion of at least IP24.

GE Confid entia l a nd Proprie tary In form

Vertical Drilling Motor, Type GEB20, GEK–91694C

3. The 5GEB20 motor shall be used with one of the drives indicated in the following table. The drive outputs shall be limited to 1500 amps max.

GE GE AC2000AW Variable Speed Drive

Cegelec Bauteil Type GD3000E AC Drive System

Unico, Inc. Type 2400 Series (Part No. 109341) with or with-out a smoothing inductor

Siemens See following illustration for range of applicable drives

Rated current indicator:

0 = 1000A (M chassis) 2 = 1200 A (L or M chassis) 5 = 1500A (M chassis) dc link voltage indicator:

V = 930 V (690 V line – line) U = 780 V (600 V line – line)

6SE704 1– * * * *

Chassis indicator:

M L

Digit 2 or 6

Siemens drive identification

4. This equipment must be supplied via a time/cur-rent dependent device to monitor and limit the tE time to 37 seconds, or a thermal protective de-vice that limits the stator windings to 170� C. In both cases above the devices must be suitably certified as compliant with European Directive 94/9/EC as a Safety Related Device.

FIG. 3. SAFE ENVIRONMENTAL

PARAMETERS FOR 5GEB20. E-45044.

5. RTD’s supplied with the motor are to be con-nected to intrinsically safe circuits to meet com-pliance of the EEx c certification for operation in hazardous locations.

DESCRIPTION

The 5GEB20 drilling motor (Fig. 1) is used by the oil and gas industry to power offshore and land–based dril-ling rigs. Designed for vertical operation, they provide more power, reliability, and easier maintenance than their DC predecessors.

Physically, the 5GEB20 is interchangeable with the GE752US2 drilling motor. Motor speed is controlled by varying the frequency of the alternating current in the motor stator windings.

GE Confid entia l a nd Proprie tary In form

DATA

Model GEB20–A1

GEB20–B1

GEB20–B2

Application Motor Rating Speed Torque Horsepowe r Ventilation IPH Time (rpm ) (lb.–ft) (scfm) Amps

0 10,600 0 2,800 1,470 15 seconds 800 7,547 1,150 2,800 1,100 Continuous

1,600 3,773 1,150 2,800 1,100 Continuous Weight (lbs):

Complete A1–5960 (2703kg) B1–6043 (2741kg) B2–6087 (2761kg) Rotor Only A1–1700 (771kg) B1–1699 (771kg) B2–1701 (772kg)

Max. Permissible Speed (rpm) 2300 Max. Permissible Vibration (Opposite Pinion End) (in./sec.) 0.44 (.01118m/s) Resistance at 25 �C (Ohms) Min. Max.

Each pair of terminals 0.0088 0.0108 RTD’s A1–10Ω Copper B1, B2–100Ω Platinum Rotor Bearings

Diametral Clearance, Assembled (in.)

Pinion End 0.005 (0.127mm) 0.009 (0.229mm) Opposite Pinion End 0.0005 (0.0127mm) 0.0035 (0.089mm)

Rotor Balance Pinion End 50–gram–inches Opposite Pinion End 50–gram–inches

Runout Measured from Shaft to Outer Race (in.)

Pinion End A1–0.004 (0.102mm) B1, B2–0.001(0.0254mm) Opposite Pinion End A1–0.003 (0.076mm) B1, B2–0.001(0.0254mm)

Lubrication Rotor Bearing Grease Capacities (oz)

Pinion End 39.1 Opposite Pinion End 31.8 Lubricant GE–D6A2C10

Grease Specification D6A2C10 grease is a lithium soap base grease with added antioxidant. It contains an oil of heavy viscosity and is especially suitable for high speed, high temperature open or shielded bearings in drilling motors.

Specifications:

Worked Consistency, 77�F, MM/10 220–240 Dropping Point, Degrees �F (Min) 380 Mineral Oil Viscosity at 100�F, SSU 475–525 Free Alkali, Percent (Max) 0.50 Free Acid, Percent (Max) Nil Color Amber Base (With Antioxidant) Lithium Oxidation Resistance Time to Reach 20 psi Drop at 210�F, Hr. (Min) 1000 Corrosion Must Pass Approved Vendor Shell Oil Brand Name Cyprina RA

Megger Test min. 2 megohms HI–Pot 3500 Vrms, 60 Hz for 1 Minute

GE Confid entia l a nd Proprie tary In form

TORQUE VALUES

Bolt torque values: lb.–ft. N–m

Cover, top (connection end) 22–24 30–33 Frame head, connection–end 448–496 607–672 Frame head, drive–end 448–496 607–672 Motor cover, lead entry 56–60 76–81 Rotor bearing cap, connection–end 111–123 149–163 Rotor bearing cap insert, drive–end 111–123 149–163 Rotor bearing housing, connection–end 111–123 149–163 Rotor bearing nut, connection–end 500–520 678–705 Rotor bearing nut set screws, connection–end 38–42 52–57 Speed sensor assembly (if provided) 18–21 24–28 Speed sensor clamp bolts (if provided) 22–24 30–33

SPECIAL TOOLS AND EQUIPMENT

Rotor shaft lifting eyebolt (1 in.–8 steel) N672P39 Rotor dummy drive–end bearing cap 6796493P3 Rotor drive–end bearing pilot 8849499P7 Rotor bearing nut spanner wrench 9945228 Rotor dummy connection–end bearing cap 41C689896 Bearing assembly pullers 41D736059G1 Digital pyrometer kit 2X3430 Megohmmeter (Megger) 111X910 (or equivalent) Long guide studs (2 required) N/A Hub assembly gauge 41D790941G1 Hub puller (less pump) 41B535703G1 Pump (for hub puller) 8843947G1 Megohmmeter (or “Megger”�) 600 volts111X910 or equivalent Voltmeter Simpson Multimeter, Model 260 or equivalent

GE Confid entia l a nd Proprie tary In form

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 inju� ry 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

FIG. 4. DRILLING MOTOR - FRAME GROUNDING

CABLE CONNECTIONS. E-43083.

GROUND BLOCK

not already have ground cables to all machinery struc-tures. Offshore rigs with equipment fastened to the decks by bolting or welding should not require additional grounding. (References: ABS Rules for Building and Classing Steel Vessels, Section 35.9.6, and IEEE Stan-dard 45–1977, Recommended Practice for Electrical In-stallations on Shipboard, Section 21.4.)

GROUNDING PROCEDURES

The GEB20 has a ground block attached to the frame as shown in Fig. 4. The mounting stud is 3/8–16 thread.

1. To attach a ground cable to the ground block, ob-tain a 3/8–16 nut and a lockwasher. Also obtain a cable lug to fit the ground cable and large enough for the 0.375 diameter bolt.

2. Prepare a ground conductor* long enough to run from the motor frame to an existing ground con-ductor system or to a suitable equipment ground point as defined by the National Electrical Code Article 250 or other applicable regulation. Check that the system ground detector is also con-nected to the Common ground point for the rig and make connection if necessary.

3. Install terminal lugs on cable. Remove paint, rust and oil from all surfaces to which the cables are to be attached and bolt the lugs securely to these surfaces (torque to 25 ft.lbs.)

LUBRICATION

ROTOR BEARINGS

Periodic lubrication is required on all GEB20 vertical drilling motors between scheduled overhaul periods.

Every 6 months or 2500 hours apply approximately 2 ounces of grease (D6A2C10, Cyprina RA ) at each end.

See Fig. 6 for lubrication locations

*Use 4/0 size or larger copper cable for GEB20 ma� chines. (Reference: National Electrical Code, 1978

Edition, Table 250-95.)

� Tradename of James G. Biddle Co.

GE Confid entia l a nd Proprie tary In form

CABLE

GLANDS

FIG. 5. CABLE GLAND LOCATION. E-43087.

INSPECTION

MONTHLY

Inspect the exterior of the motor, including cables, for damage. Inspect cable glands (Fig. 5) for tightness as well.

Covers, Seals, Latches

Clean the outside of the machine and remove the in-spection covers. Use clean, dry compressed air and blow the dirt and dust from the interior of the machine.

WARNING: When using compressed air for clean� ing purposes, flying debris and particles may present a hazard to personnel in the immediate area. Personnel should be provided with, and trained in the use of, personal protective equip� ment as specified by applicable federal or state safety regulations.

Check exterior covers to be sure felt seals are intact.

If seals are missing or covers are damaged, replace seals or covers as necessary. Make sure covers fit prop-erly and are bolted securely.

Power Cables

Inspect the power cables and terminals for signs of excessive heating, poor insulation, chafing, or mechani-cal damage. Verify that all cable connections are tight, and that cables are secured. Check for damaged cable bushings, loose or missing cable cleat hardware, etc.

Insulation

Measure the insulation resistance with a megohmmeter (Megger) to determine the condition of the insulation. If reading is low, make a further inspec-tion to determine if insulation failure or excessive mois-ture is causing the low megohmmeter reading. Correct the cause of low readings before returning the motor to service.

Megohmmeter tests will determine the condition of the insulation to ground or between windings by testing for high resistance paths. Megohmmeter readings are most affected by moisture, dirt build–up, or carbon tracking. When a low megohmmeter reading is ob-tained, the reading may be raised by cleaning and bak-ing the components. If the reading does not rise, disas-sembly is required.

Apply a 500–volt megohmmeter test between the trac-tion motor TA lead and the cleaned ground connection on the cable cleat of the stator frame to determine the condition of the stator coil insulation. Ohmic values less than 2 megohms indicate a dirt and/or moisture prob-lem. Refer to CLEANING section of this publication.

Ground Cable

Ensure that the ground cable is bolted securely to the drilling motor and base equipment mounting surface.

Mounting Bolts

Check all mounting bolts to assure tightness. Ob-serve for cracking, deformities, looseness, or other ob-vious damage.

Speed Sensor Gap

(if supplied)

Ensure the gap between the speed sensor assembly and the speed sensor gear is 0.036 to 0.20 in. (0.91 to 0.51mm). Tighten the sensor mounting bolts to the torque given in the Torque Values section of this publi-cation.

CLEANING

It is essential that the drilling motor be kept as clean as possible, both inside and outside. When the drilling

GE Confid entia l a nd Proprie tary In form motor assembly has been removed from it’s machinery base, any accumulation of oil or grease–soaked dirt should be removed from both inside and outside.

Clean the drilling motor as follows:

WARNING: Personnel performing cleaning oper-ations must wear protective clothing, gloves and eye protection to avoid injury. To prevent per-sonal injury when cleaning with compressed air, observe all railroad and Government regulations.

1. Cover the air inlet and outlet openings in the mo-tor frame with heavy plastic and tape.

CAUTION: Alkali and chlorinated hydrocarbon cleaning solutions are not recommended for cleaning traction motors due to their adverse ef-fect on the motor insulation system.

2. Steam clean the exterior surfaces. Avoid forcing moisture inside the motor. Recommended cleaning compounds are: CHEMICAL METH- ODS, INC., 809 OR 809–NP:DuBois U.S.A., Je-tacin or Dusqueeze.

3. Remove the protective coverings from the motor openings.

CAUTION: When applying heat to the motor, do NOT expose the speed sensor to heat above 176�F (80�C).

4. Using compressed air, blow out the interior of the motor to remove all dirt and moisture. Apply heat if necessary to dry the motor thoroughly.

LOCKING THE ROTOR FOR

SHIPMENT

LOCKING SEQUENCE

1. Remove the 2 bolts diametrically opposite on the 13.50” dia. bolt circle of the pinion end frame-head.

2. Replace with locking bolt(2) and nut(1) (Fig. 7).

3. Torque locking bolt(1) to 30ft.lbs., then tighten-nut(2).

4. Paint bolt heads yellow.

PINION END CONNECTION END

.25 NPT PLUG

FOR REGREASING

.25 NPT – 2 HOLES

FOR REGREASING

FIG 6. LUBRICATION LOCATIONS, PINION AND CONNECTION ENDS. E-43086

GE Confid entia l a nd Proprie tary In form

CAUTION

REF. DESCRIPTION

1 NUT, 5/8–11

2 5/8–11X4.5 BOLT

3 BAG TAG

FIG. 7. ROTOR LOCKING SEQUENCE. E-43081

5. Place bolts and washers removed in bag(3) and attach as shown (Fig. 7).

6. When motor reaches final destination, replace p16 and p17 with bolts and washer in bag.

SHIPPING

Whenever drilling motors are to be shipped, they must be properly skidded and secured to prevent any damage in transit. The drawing that follows (Fig. 8) il-lustrates a proven method of skidding these machines for handling and shipment.

HANDLING

To avoid damage to the machine during handling, re-view the following cautionary statements:

1. Do not lift motors by the shaft extension of the Rotor.

2. Do not allow the rotor to bump another object.

3. Do not tighten coupling assembly bolts with an air wrench or by pounding.

4. Do not remove rotor end–play by any other means than axial blocking.

5. Do not load the rotor radially (strap down) for shipment.

CLEANING AND SLUSHING

Before skidding the machine for shipment, all ex-posed finished surfaces not already painted should be cleaned and slushed as follows:

1. Remove all corrosion.

2. Wipe off the surface with clean rags and wet with petroleum spirits GE–D5B8.

3. Follow with a clean rag wet with methanol, then wipe dry. DO NOT touch the cleaned surface with bare hands.

4. Slush immediately after cleaning with GE–D6C6A1 slushing compound.

SKIDDING

Use yellow pine timbers large enough to support the weight of the machine. The recommended size is illus-trated in Fig. 8.

PROTECTION

When any apparatus is shipped in the open, it should be fully protected from rain, snow, dirt, etc., by covering with some suitable weatherproof material.

STORAGE

PLACING INTO STORAGE

When placing GE drilling motors into storage, the fol-lowing preparations should be performed to prevent damage to the equipment as a result of the storage.

Machines should be placed on a pallet and stored in-doors if possible. A clean, dry ambient of 60° F is pre-ferred. In a high humidity environment, an ambient of 70° F is recommended. Every attempt should be made to avoid widely varying temperatures and high humidity.

GE Confid entia l a nd Proprie tary In form

REMOVING FROM STORAGE

Before placing a stored motor in service, perform the following:

1. Blow dust and dirt accumulation out of the stator coil with clean, dry air.

2. Visually inspect for corrosion and general de-fects.

3X3 2X6

3X6

–1

/2

3/4 DIA.

(4 HOLES)

8– 3/

3X3

3X3

3X63X6

2X6

ALL DIMINSIONS IN INCHES

3X3

FIG. 8 SKID CONSTRUCTION DETAILS E-43112

3. Check stator coil insulation continuity to ground with a 500 volt megger. If the megger reading is less than 2 megohms, the stator should be baked or dried until the moisture content is sufficiently 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 stator coils, consider-ation 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 rotor from the frame and remove bearings from the rotor shaft.

b. Heat the frame and rotor until dried sufficient-ly 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. f facilities are available, give the reassembled machine a running test to check the bearings.

GE Confid entia l a nd Proprie tary In form

TB

TCTA

N6

34 12

22 24

14 1510 11 12 139 16 17 18

19 25 26 27

184243

12 16

40 39 3841

4645 44

REF. DESCRIPTION

1 D.E. SHAFT COLLAR

2 FLINGER

3 ROLLER BEARING

4 SLEEVE

5 BEARING CAP (OUTER)

6 BOLT AND LOCKWASHER

7 GASKET

8 GREASE PIPING

9 BOLT AND HARD WASHER

10 D.E. FRAME HEAD

11 BEARING CAP (INNER)

12 ROTOR END PLATE

13 TIE RING

14 STATOR END PIECE

15 ROTOR END RING

16 BALANCE WEIGHT

17 ROTOR BAR

18 STOP PIN

19 STATOR CORE

20 STATOR FRAME

21 STATOR COIL

22 CORE STIFFENING RING

23 CLAMP BRACKET

24 INSULATOR

25 SPEED SENSOR

26 C.E. FRAME HEAD

REF. DESCRIPTION

27 BOLT AND HARD WASHER

28 BUS RING CLAMP

29 BUS RINGS

30 BOLT

31 BOLT AND LOCKWASHER

32 C.E. BEARING CAP

33 SPEED SENSOR GEAR

34 BALL BEARING

35 SPACER

36 C.E. SLEEVE (OUTER)

37 ROTOR SHAFT

38 NILOS RING

39 “V” RING SEAL

40 C.E. BEARING HOUSING

41 BOLT, HARD WASHERS AND NUT

42 SHAFT WASHER

43 SHAFT NUT

44 CONNECTION COVER

45 BOLT, LOCKWASHER AND FLATWASHER

46 BOLT, LOCKWASHER AND FLATWASHER

47 SPEED SENSOR COVER

48 COVER

49 HAND HOLE COVER

50 BOLT AND LOCKWASHER

51 CONNECTOR SUPPORT

52 BOLT AND LOCKWASHER

FIG. 9. 5GEB20A1 LONGITUDINAL SECTION. E-43080

GE Confid entia l a nd Proprie tary In form

34 12

14 15

11 12 13

16 17 18

53 28272619 16 3025

36 37

424344454617

2220 21

REF. DESCRIPTION

1 D.E. SHAFT COLLAR

2 FLINGER

3 ROLLER BEARING

4 SLEEVE

5 ROTOR SHAFT

6 BEARING CAP (OUTER)

7 BOLT AND LOCKWASHER

8 GASKET

9 GREASE PIPING

10 BOLT AND HARD WASHER

11 D.E. FRAME HEAD

12 BEARING CAP (INNER)

13 STATOR AIR BAFFLE

14 TIE RING

15 STATOR COIL

16 ROTOR END RING

17 BALANCE WEIGHT

18 ROTOR BAR

19 ROTOR CAGE STOP PIN

20 STATOR FRAME

21 STATOR CORE

22 ROTOR CORE

23 BOLT, LOCKWASHER AND FLATWASHER

24 CONNECTION COVER

25 BUS RING SUPPORT

26 TIE RING

REF. DESCRIPTION

27 RTD TERMINAL BLOCK

28 TAP BLOCK

29 INSULATOR AND HARDWARE

30 BUS RINGS

32 C.E. FRAME HEAD ASSEMBLY

33 BOLT AND HARD WASHER

34 BUS RING CLAMPS

35 BOLT AND INSULATOR

36 C.E. BEARING HOUSING

37 BOLT AND LOCKWASHER

38 C.E. BEARING CAP

39 BALL BEARING

40 SLEEVE

41 SPACER

42 NILOS RING

43 “V” RING SEAL

44 ROTOR LOCKING HUB

45 SHAFT NUT

46 SHAFT WASHER

48 COVER

49 HAND HOLE COVER

50 BOLT AND LOCKWASHER

51 HAWKE GLAND

52 CABLE

53 CABLE GLAND

FIG. 10. 5GEB20B1 LONGITUDINAL SECTION. E-43611

GE Confid entia l a nd Proprie tary In form

OVERHAUL

Overhaul intervals will depend on the severity of ser-vice seen by the machine. However, General Electric Co. recommends that an overhaul be performed every 25,000 hours on all machines subjected to normal oper-ation.

The motor should be removed, disassembled, cleaned, inspected and reconditioned as necessary (in-cluding varnish treatment of rotor and stator, and fields).

Motor bearings should be replaced.

CLEANING

After the exterior of the drill motor has been cleaned, steam clean the internal metal and insulated parts as fol-lows:

WARNING: Personnel performing steam cleaning operations must wear protective clothing, gloves and eye protection to avoid injury.

CAUTION: Alkali and chlorinated hydrocarbon cleaning solutions are not recommended for cleaning traction motors due to their adverse effect on the motor insulation system.

NOTE: Do NOT exceed 30 to 40 psi (207 to 276 kPa) steam pressure.

1. Use steam in combination with a commercial non–caustic cleaner, such as CHEMICAL

METHODS, INC., 809S.

2. Suspend the motor in a position accessible from all directions to a direct flow of steam from the hose.

3. Rinse all residue from the motor with a mixture of clean steam and water.

4. Bake the motor for at least four hours at 302�F (150�C) to remove all moisture from insulated parts.

DEFECT RECORDS

Prior to beginning an overhaul, record the following in-formation to aid in tracking the drill motor and compo-nent parts and to determine the defects:

1. Log the motor frame serial number. After tear-down, record the rotor serial number also.

2. Visually inspect the motor for defects.

3. Test the motor as outlined in STATIC ELEC- TRICAL TEST section of this publication.

4. Fill out a defect sheet for the motor frame, and another defect sheet for the motor rotor. These sheets should list defects found in the electrical test, visual inspection, and inspections defined in specific sections of this publication. The defect sheets should travel through the shop with the frame or rotor. Defects should be added when found, and marked off when repaired.

VISUAL INSPECTION

Visually inspect the drill motor as follows:

1. Examine the stator for damaged coils, insulation and wedges.

2. Inspect the stator for blistered, flaked or cracked coil–insulating varnish.

3. Examine the bus rings for loose or burnt connec-tions and cables.

STATIC ELECTRICAL TESTS

WARNING: Electrical shock can cause serious or fatal injury. Proper precautions should be taken and observed by personnel performing testing to avoid such injury.

MEGOHMMETER (“MEGGER”) TESTS

Megohmmeter (“Megger”�) tests will determine the condition of the insulation to ground or between wind-ings by testing for high resistance paths. Megohmmeter readings are most affected by moisture, dirt build–up, or carbon tracking. When a low megohmmeter reading is obtained, the reading may be raised by cleaning and baking the components. If the reading does not rise, GE Confid entia l a nd Proprie tary In form disassembly is required.

Apply a 500–volt megohmmeter test between the drill motor TA lead and a cleaned ground connection on the stator frame to determine the condition of the stator coil insulation. Ohmic values less than 2 megohms indicate a dirt and/or moisture problem. Refer to CLEANING section of this publication.

HIGH–POTENTIAL (“HI–POT”) TESTS

WARNING: High–potential (“HI–POT”) testing can cause serious injury or death. Strict safety regulations must be observed during such testing.

High–potential (“HI–POT”) tests evaluate the insula-tion dielectric strength (ability to insulate) of motor com-ponents. A high–potential test set applies high voltage between the windings and ground or between windings.

CAUTION: Always test with a megohmmeter first.

High–potential test only after megohmmeter tests show two megohms resistance or higher.

High–potential test only after the windings have been cleaned and baked dry. If a failure occurs as a result of a high-potential test, the motor will be permanently damaged.

Apply an AC high–potential test at the voltage given in DATA section of this publication between the drill motor TA lead and the cleaned ground connection on the cable cleat of the stator frame. Ground one lead of each RTD during this test.

HUB REMOVAL

When removing a hub, use a suitable puller, similar to Part 41B535703G1, Fig. 11. This is a simple, efficient hydraulic puller employing the float method of removal.

A complete unit consists of a pump kit, a backing plate, an adapter, a felt ring and a bolt.

NOTE: Do not heat the hub before pulling it, and do not use steel wedges between the hub and bearing cap.

1. Remove the set–screw plug from the tapped hole in the end of the shaft.

� Trademark of James G. Biddle Company.

2. Screw the backing plate, with felt ring in place, to the end of the shaft as tight as possible by hand.

Back off the backing plate to line up the slot with the tapped hole in the end of the shaft. This is to provide sufficient clearance for the hub to pop off.

3. Screw the pressure–fitting adapter into the hole in the shaft until it seats at the bottom.

4. Attach the pump by screwing the connector on one end of the pressure tube into the adapter, and the other end into the pump.

5. Close the hand relief valve and work the pump handle to force oil into the groove in the armature shaft under the hub. When sufficient pressure has been built up, the hub will pop off the shaft and be stopped by the felt washer and backing plate.

NOTE: Capacity of the pump is 40,000 psi. It holds sufficient oil to remove eight to ten hubs;

check at each use. Periodically, remove the fill-ing plug and refill with SAE–10 lubricating oil.

6. Open the relief valve, disconnect the pump from adapter, remove the adapter and backing plate from the shaft, and lift off the hub. Reinsert the plug to prevent clogging the hole.

CAUTION: Special precautions should be tak� en to avoid damage to the rotor, bearings, or bearing fits, when lifting the rotor in the vertical position or turning rotor to a horizontal posi� tion.

ROTOR DISASSEMBLY PROCEDURES

ROTOR REMOVAL

Remove the drill motor rotor from the stator frame as follows:

NOTE: For convenience, the numbers in paren-thesis () refer to part numbers in Fig. 9 of this publication, unless otherwise noted. The bear-ing and frame head assemblies for all the GEB20 models are similar enough that assem-bly and disassembly procedures are the same.

GE Confid entia l a nd Proprie tary In form

1. Place the drill motor in a horizontal position.

2. If supplied, remove the four bolts and washers holding the speed sensor cover to the connec-tion end of the stator frame. Remove the two speed sensor mounting bolts (30) and place the speed sensor assembly in a secure place out-side the stator frame.

3. Remove the eight bolts and flat washers (31) se-curing the connection–end bearing housing to the connection–end frame head. Remove the connection–end bearing cap (32) and sleeve (36).

4. Screw two long guide studs through the frame head and into the connection–end bearing hous-ing in opposite holes of the six just emptied.

These studs will help to guide the rotor out of the motor frame.

5. Place the motor on a heavy–duty stand with the drive–end up. Level the motor so that the rotor can be lifted vertically with a hoist without dam-aging the bearings or bus rings.

6. Remove the four bolts (9) and flat washers hold-ing the drive–end frame head to the motor frame.

7. Screw a 1in.–8 steel lifting eyebolt (GE Tool N672P39) into the threaded hole in the drive– end of the rotor shaft (37).

8. Align the hoist cable with the centerline of the ro-tor, and attach the hoist hook to the lifting eye.

NOTE: The connection–end bearing and hous-ing and the drive–end frame head, bearing and housing are removed with the rotor as an as-sembly.

CAUTION: Use extreme care when turning the rotor to the horizontal position to avoid damage to the core and the bearing and frame head fits. Use two hoists when positioning the rotor horizontally.

9. Carefully lift the rotor assembly out of the motor stator, and place the rotor in a horizontal position on a wooden cradle supporting the core assem-bly.

10. With the rotor in the horizontal position, remove the two long guide studs from the connection– end bearing housing.

11. Remove and service the rotor bearings accord-ing to instructions in BEARING ASSEMBLIES REMOVAL section of this publication

BEARING ASSEMBLIES REMOVAL

Connection–End Bearing

NOTE: Numbers in parenthesis () refer to part numbers in Fig. 12 of this publication, unless otherwise noted.

1. Assemble the bearing puller (GE Tool 41D736059G3), and use the hydraulic jack to pull the connection–end bearing housing (2) and bearing (4) from the rotor shaft.

FIG. 11. HYDRAULIC COUPLING HUB PULLER. E-23829.

GE Confid entia l a nd Proprie tary In form

2. Position the bearing housing – with the bearing down – on a flat surface. Reassemble the bear-ing puller (to GE Tool 41D736059G4), and use the hydraulic jack to push the bearing from the bearing housing.

Drive–End Bearing

NOTE: Numbers in parenthesis () refer to part numbers in Fig. 13 of this publication, unless otherwise noted.

1. Remove the eight bolts (6) and flat washers from the outer bearing cap insert (5).

2. Support the weight of the drive–end frame head

(10) with a hoist, taking care not to lift the rotor off its support. Assemble the bearing puller (GE Tool 41D736059G2); and use the hydraulic jack to pull the frame head, roller bearing (3), bearing flinger (2), outer bearing cap (5), outer sleeve (4), and inner bearing cap (11) from the rotor shaft.

3. Use an arbor press and fixtures to separate the bearing assembly components.

NOTE: Remove the collar (1) only if damaged, if outside of inspection limits, or if the shaft must be removed from the rotor. If necessary, use a puller tool to remove the collar.

ROTOR SHAFT INSPECTION

1. Measure both rotor–shaft bearing mounting di-ameters. Ensure that the rotor shaft centers are not damaged.

2. Place the rotor shaft and core on centers in a lathe, and measure the bearing fit surface runout on each end with a dial indicator. Runout must not exceed 0.001 in. (0.025 mm).

3. Visually check the shaft for defects such as burrs, upset metal, damaged threads, etc.

NOTE: If out–of–limit measurements or exces-sive damage are observed, the rotor must be re-placed.

STATOR COILS AND BUS RINGS

CONNECTION–END

FRAME HEAD REMOVAL

NOTE: Numbers in parenthesis () refer to part numbers in Fig. 9 of this publication, unless otherwise noted.

Removal of the connection–end frame head (26) may be required to gain access to the bus rings and stator coil connections. Remove the eight bolts and flat wash-ers (27) holding the frame head to the motor frame, and then remove the frame head.

CLEANING AND INSPECTION

Prior to performing disassembly or repair operations, clean and inspect the stator as follows:

1. Ensure that the motor is clean as specified in CLEANING section of this publication.

WARNING: To prevent personal injury when cleaning parts with compressed air, observe all government safety regulations.

2. Blow out the inside of the stator with clean, dry compressed air. Dirt and dust tend to collect in

FIG. 12. CONNECTION–END BEARING

DETAILS. E–43615.

8,9

GE Confid entia l a nd Proprie tary In form the stator, and – if allowed to accumulate – can in time cause an electrical failure.

WARNING: If commercial cleaning solvents are used, the precautions cited by the manufacturer regarding toxicity, flammability and ventilation MUST BE STRICTLY FOLLOWED to prevent serious or fatal injury to personnel.

3. If oil or grease is on a coil or connection, wipe off with a cloth dipped in commercial cleaning sol-vent.

CAUTION: Do NOT use too much solvent, as the solvent may soak into the insulation with damaging effects.

4. Examine the bus rings for damaged or loose con-nections. Observe the condition of coil insulation and the varnish surface. Evidence of burned or charred insulation from an overheating condition usually indicates a defective coil.

STRIPPING INSULATED CONNECTIONS

Insulation is removed from connections by cutting, re-quiring the use of a hammer, knife, chisel, screwdriver and Channel–Lock pliers.

1. Position the stator frame to obtain the best work-ing position for the connections to be cleaned.

FIG. 13. DRIVE–END BEARING DETAILS.

E–43616.

9 10

2. Use the chisel, knife and hammer to cut the in-sulation. Cut the insulation down to the copper the full length of the connection.

3. After cutting the insulation the full length, pry the insulation away from the connection using the knife or screwdriver.

4. Brazing tool heat can be used to soften the in-sulation for final cleaning. Alternately heat the in-sulation and scrape off all material until reaching bare copper.

CONNECTION–END FRAME

HEAD INSTALLATION

NOTE: Numbers in parenthesis () refer to part numbers in Fig. 9 of this publication, unless otherwise noted.

To assemble the connection–end frame head (26), install and hand–tighten the eight bolts and flat washers

(27) holding the frame head to the motor frame. Then torque the bolts evenly in a diametrically opposite se-quence to 468 �28 ft.lbs.

ROTOR ASSEMBLY PROCEDURES

ROTOR BALANCING

Dynamic balance of the rotor assembly is required for smooth operation and low vibration. If not corrected, an out–of–balance rotor will lead to complete motor failure.

The rotor must be balanced to within 50 gram–in. at both ends of the rotor.

NOTE: For best results, dynamic balancing should be done with the drive–end bearing col-lar (item 1 in Fig. 9) in place. See BEARING AS- SEMBLIES, DRIVE–END BEARING section of this publication for spacer and collar assembly instructions.

These instructions pertain only to the location and method of attaching the balance weights. The set–up, fixtures to hold components in the balance machine, and the procedures required to obtain a balance within specified limits is dependent on the type of balance ma-chine. Therefore, follow the operating procedures for

GE Confid entia l a nd Proprie tary In form the balance machine used.

CAUTION: Use ONLY the specified welding rod.

Use of other types may result in poor welds leading to motor failure.

NOTE: Keep weld splatter out of the rotor core vent holes when welding balance weights to the end plates.

Attach the balance weights as needed by welding to the rotor end plates at a diameter of 10.90 in. (276.9 mm). Use welding rod GE Spec. B50E37, BRONZE (AWS–E–Cu–Sn–C).

ROTOR BEARING ASSEMBLIES

Drive–End Bearing

NOTE: Numbers in parenthesis () refer to part numbers in Fig. 13 of this publication, unless otherwise noted.

1. Inspect to ensure that all mating surfaces of the rotor drive–end bearing assembly parts are clean and free of nicks and burrs.

2. If removed, heat the rotor drive–end collar (1) to 212�F (100�C) in an oven. With the rotor in the horizontal position, apply the heated collar to the rotor shaft, seating tightly against the rotor shaft shoulder, and secure the collar in position until cooled.

3. Smear the inside diameter of the rotor drive–end inner bearing cap (11) with GE Specification D6A2C10 grease (Fig. 14), and pack the inner cavity of the bearing cap with 4.8 oz. (136 g) of the grease (Fig. 15). Install the inner bearing cap over the collar.

4. Heat the rotor drive–end bearing flinger (2) to 212�F (100�C) in an oven. Apply the heated flinger to the rotor shaft, seating tightly against the collar (1), and secure the flinger in position until cooled.

5. Heat the inner race of the rotor drive–end roller bearing (3) to 212�F (100�C) in an oven. Apply the bearing inner race to the rotor shaft, seating

FIG. 14. DRIVE–END BEARING GREASE

DISTRIBUTION. E–45100.

FILL BEARING COMPLETELY

WITH 29oz (822g)

OF GREASE (D6A2C10)

SMEAR RUNNING SURFACES

WITH 0.50 0Z. (14 G)

OF GREASE (D6A2C10)

USE 4.8oz (136g)

GREASE (D6A2C10)

IN EACH CAVITY

tightly against the bearing flinger (2), and secure the inner race in position until cooled (Fig. 16).

6. Pack the outer race (Fig. 17) and bearing rollers of the rotor drive–end roller bearing (3) with 29

oz. (822 g) of GE Specification D6A2C10 grease (Fig. 18).

NOTE: If proper press equipment is available, cold pressing of the rotor drive–end roller bear-

FIG. 15. APPLYING GREASE TO DRIVE–END

INNER BEARING CAP. E–27156.

GE Confid entia l a nd Proprie tary In form ing outer race (3) into the frame head (11) is pre-ferred. If proper equipment is NOT available, heat the frame head to 212 �F (100�C) in an oven, and install the bearing outer race in the heated frame head.

7. Cold–press the rotor drive–end bearing outer race and rollers (3) into the drive–end frame head (11). Refer to Fig. 14 for the approximate bearing race position in the frame head.

NOTE: Without the use of a rotor drive–end bearing pilot, the upper–most rollers will drop toward the center, making the assembly of roll-ers over the inner race difficult. Refer to SPE- CIAL TOOLS AND EQUIPMENT section of this publication for the bearing pilot, guide stud and dummy bearing cap part numbers.

8. Install the drive–end bearing pilot on the rotor shaft (Fig. 19). Screw a guide stud into one of the threaded holes in the inner bearing cap (11).

CAUTION: Ensure that the vent hole in the rotor pinion–end bearing cap, gasket and framehead all line up when assembled.

9. Apply the gasket (7) over the guide stud to the ro-tor drive–end inner bearing cap (11).

FIG. 16. DRIVE–END INNER BEARING CAP,

FLINGER AND BEARING INNER RACE

INSTALLED. E–27157.

FIG. 17. GREASE IN DRIVE–END BEARING

OUTER RACE. E–27158.

FIG. 18. GREASE IN DRIVE–END BEARING

ROLLERS AND OUTER RACE. E–27159.

GE Confid entia l a nd Proprie tary In form

10. Supporting the weight of the frame head (10) with a hoist, slide the frame head, drive–end bearing outer race and rollers assembly over the bearing pilot and guide stud onto the rotor shaft (37), seating tightly against the drive–end inner bearing cap (11) and gasket (Fig. 20). Hold the frame head and bearing in place until the frame head is bolted to the inner bearing cap in Step 11.

11. Remove the bearing pilot. Apply the gasket over the guide stud to the drive–end frame head (10).

After removing the guide stud, secure the dummy drive–end bearing cap and frame head to the inner bearing cap with eight bolts and flat washers (6).

NOTE: Do NOT assemble the additional rotor drive–end bearing assembly parts until the ro-tor has been assembled into the frame, and bearing clearance and runout checks have been completed.

Connection–End Bearing

NOTE: Numbers in parenthesis () refer to part numbers in Figs. 12 and 21 of this publication, unless otherwise noted.

1. Inspect the rotor connection–end bearing hous-ing (2) to ensure that both inside bores are clean and free of nicks and burrs.

FIG. 19. DRIVE–END BEARING PILOT AND

GUIDE STUD INSTALLED. E–27165.

GUIDE STUD FOR

ASSEMBLING

FRAME-

HEAD BOLTS IN IN�

NER BEARING CAP

BEARING PILOT USED

TO GUIDE FRAMEHEAD

(WITH OUTER RACE AND

ROLLERS) OVER THE IN�

NER RACE.

FIG. 20. DRIVE–END FRAME HEAD AND

BEARING ASSEMBLY. E–27166.

BEARING PILOT

GUIDE STUD

FIG. 21. CONNECTION–END BEARING GREASE

DISTRIBUTION. E–45099.

FILL BEARING COMPLETELY

WITH 20.8oz (590g)

OF GREASE (D6A2C10)

USE 5.2oz (147g)

OF GREASE (D6A2C10)

IN THIS CAVITY

SMEAR RUNNING SURFACES

WITH 0.80oz (23g)

OF GREASE (D6A2C10)

USE 5.2oz (147g)

OF GREASE (D6A2C10)

IN THIS CAVITY

GE Confid entia l a nd Proprie tary In form

2. Fill the cavity of the rotor connection–end bear-ing housing (2) with 5.2 oz. (147 g) of GE Specifi-cation D6A2C10 grease.

3. Fully pack the rotor connection–end ball bearing

(4) with 20.8 oz. (590 g) of GE Specification D6A2C17 grease.

4. Evenly heat the rotor connection–end bearing housing (35) to 212�F (100�C) in an oven. Place the heated bearing housing on a flat surface, ex-posing the bearing cavity. Immediately slip the rotor connection–end ball bearing (4) into the bore of the bearing housing.

5. Smear the running surfaces of the connection– end of the rotor shaft with 0.8 oz. (23 g) of GE Specification D6A2C10 grease.

6. Heat the rotor connection–end bearing and bear-ing housing assembly to 212�F (100�C) in an oven. Remove the heated assembly from the oven, and immediately slide the assembly onto the rotor shaft, seated tightly against the rotor shaft shoulder, and secure the assembly in posi-tion until cooled.

7. Apply the gasket, and assemble the dummy con-nection–end bearing cap with the six bolts (8) and flat washers.

NOTE: The rotor connection–end bearing as-sembly is completed as part of the rotor instal-lation.

ROTOR INSTALLATION INTO FRAME

NOTE: The connection–end bearing and hous-ing and the drive–end frame head, bearing and housing are installed with the rotor as an as-sembly.

NOTE: Numbers in parenthesis () refer to part numbers in Fig. 9 of this publication, unless otherwise noted.

1. Inspect to ensure that all mating surfaces are clean and free of nicks and burrs.

2. Place the motor frame (20) on a heavy–duty stand with the drive–end up. Level the motor frame so that the rotor can be lowered vertically into the frame with a hoist without damaging the bearings or bus rings.

3. Screw two long guide studs into the connection– end bearing housing (40) in opposite holes.

These studs will help to guide the rotor into the motor frame.

4. Screw a 1 in.–8 steel lifting eyebolt (GE Tool N672P39) into the threaded hole in the drive– end of the rotor shaft (37).

CAUTION: Exercise extreme care when turning the rotor from the horizontal position to avoid damage to the core and the bearing and frame head fits. A suitable turning fixture or two hoists should be used to position the rotor vertically.

5. Carefully lift the rotor assembly from the horizon-tal position, attaching a hoist hook to the lifting eye. Align the hoist cable with the centerline of the motor frame (20), and slowly lower the rotor into the motor frame, guiding the long studs through the appropriate connection–end frame head (26) holes.

6. Install and hand–tighten the four bolts and flat washers (9) holding the drive–end frame head

(10) to the motor frame (20). Then tighten the bolts evenly in a diametrically opposite se-quence to the torque given in TORQUE VAL- UES section of this publication.

7. Remove the motor from the stand, placing the motor in its normal horizontal position

8. Force the rotor as far toward the connection end as possible. Remove the two long guide studs from the connection–end bearing housing (40).

Install the six bolts and flat washers (31) securing the connection–end bearing housing (40) to the connection–end frame head (26), and tighten the bolts to the torque given in TORQUE VALUES section of this publication.

GE Confid entia l a nd Proprie tary In form

ROTOR BEARING ASSEMBLIES CHECKS

Connection–End Bearing Runout

1. Raise the connection end of the motor 4 to 6 in.

(102 to 152 mm), and force the rotor toward the pinion end.

2. Clamp a dial indicator to the face of the rotor shaft at the connection end.

3. Zero the indicator ball on the face of the connec-tion–end rotor bearing outer race. Then rotate the rotor to determine the bearing runout. If the bearing runout exceeds the runout given in DATA section of this publication, retighten the connection–end bearing housing and frame head bolts; and repeat the runout check. If nec-essary, disassemble the bearing assembly and check for burrs or dirt. Replace the connection– end bearing housing if the runout is still exces-sive.

Drive–End Bearing Runout

1. Raise the drive end of the motor 4 to 6 in. (102 to 152 mm), and force the rotor toward the connec-tion end.

2. Clamp a dial indicator to the face of the rotor shaft at the drive end.

3. Zero the indicator ball on the face of the pinion– end rotor bearing outer race. Then rotate the ro-tor to determine the bearing runout. If the bear-ing runout exceeds the runout given in DATA section of this publication, retighten the drive– end bearing housing and frame head bolts; and repeat the runout check. If necessary, disas-semble the bearing assembly and check for burrs or dirt. Replace the drive–end bearing housing if the runout is still excessive.

Drive–End Bearing Radial Clearance

1. With drive end of the motor raised 4 to 6 in. (102 to 152 mm), force the rotor toward the connec-tion end.

2. Select a feeler gage thickness equal to the mini-mum radial clearance given in DATA section of this publication for the drive–end rotor bearing.

3. Place the feeler gage flat against the rolling sur-face of the inner race of the drive–end rotor bear-ing, just in front of the uppermost bearing roller.

Hand–turn the rotor shaft just enough to roll the top bearing roller over the minimum radial clear-ance feeler gage.

4. Repeat the minimum clearance check for each bearing roller in the drive–end rotor bearing. Re-ject the bearing if one or more bearing rollers will not roll over the minimum radial clearance feeler gage.

5. Select a feeler gage thickness equal to the maxi-mum radial clearance given in DATA section of this publication for the drive–end rotor bearing.

Place the feeler gage flat against the rolling sur-face of the inner race of the drive–end rotor bear-ing. Hand turn the rotor shaft to check that none of the bearing rollers will roll over the maximum radial clearance feeler gage. Reject the bearing if one or more bearing rollers will roll over the maximum radial clearance feeler gage.

ROTOR SHAFT END–PLAY CHECK

1. With the motor horizontal, force the rotor to seat at the drive end.

2. Clamp a dial indicator to the motor frame at the connection end or the dummy connection–end bearing cap. Zero the indicator ball on the face of the rotor bearing nut.

3. Force the rotor back to seat at the connection end. The amount of rotor shaft end–play indi-cated must not exceed the end–play given in DATA section of this publication.

FINAL ASSEMBLY OF

ROTOR DRIVE–END

If the rotor bearings pass the bearing runout and radial clearance checks, install the remaining drive–end as-sembly parts as follows:

NOTE: Numbers in…