Baldor MN409 Installation & Operating Manual

BALDOR MN409 Large AC Motors Handbook

This manual contains general procedures that apply to Baldor Motor products.

Be sure to read and understand the Safety Notice statements in this manual.

For your protection, do not install, operate or attempt to perform maintenance

procedures until you understand the Warning and Caution statements. A

Warning statement indicates a possible unsafe condition that can cause harm

to personnel. A Caution statement indicates a condition that can cause

damage to equipment.

instrunction manuals to help users access anytime and

anywhere, helping users make better use of products.

Large AC Motors

Global Series TEFC/TEAO

Horizontal Mounting

Installation & Operating Manual

6/08 MN409

Any trademarks used in this manual are the property of their respective owners.

Table of Contents

Table of Contents iMN409

Section 1

General Information 1−1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Overview 1−1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Safety Notice 1−1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Receiving 1−3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Handling 1−4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Storage 1−4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Unpacking 1−4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Section 2

Installation & Operation 2−1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Overview 2−1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Location 2−1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Foundation 2−1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Pre−Installation Checks 2−2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Grouting 2−2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Doweling & Bolting 2−2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Coupling 2−2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Lubrication 2−3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Anti−Friction

Bearings (Grease Lubricated) 2−3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Sleeve Bearing (Oil Lubricated) 2−3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Electrical Connection 2−3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

AC Power 2−3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Grounding 2−3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

First Time Start Up 2−4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Coupled Start Up 2−5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Jogging and Repeated Starts 2−5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Section 3

Maintenance & Troubleshooting 3−1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Periodic Inspection 3−1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Bearing Lubrication 3−2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Sleeve Bearings (Oil Lubricated) Instructions 3−3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

G50 Sleeve Bearing & Cartridge Removal Instructions 3−4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

G5000, G315, G5810 and G40 Sleeve Bearing & Cartridge Removal 3−5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Sleeve/Anti−Friction Bearing Bracket Removal 3−7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Anti−Friction Bearing Removal/Replacement 3−7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Rotor And Stator Removal 3−7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Winding Maintenance 3−7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Section 4
Optional Accessories 4−1.

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Winding Resistance Temperature Detector RTD 4−1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Winding Thermostat 4−1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Winding Thermocouple − TIC 4−2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Winding Thermistors 4−2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Bearing Resistant Temperature Detector − RTD 4−2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Suggested bearing and winding RTD setting guidelines 4−3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Bearing Thermocouple − TIC 4−4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Bearing Thermostat 4−4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Bearing Thermometer 4−4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Space Heaters 4−5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Oil Circulation System 4−5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Constant Level Oiler 4−6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Current Transformers 4−6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Lightning Arrestors And Surge Capacitors 4−6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Section 1
General Information

ii Table of Contents MN409

Appendix

API Documentation A−1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Outline Drawing A−1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Anti−Friction Bearing A−2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Sleeve Bearing A−3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Section 1
General Information

General Information 1-1MN409

Overview This manual contains general procedures that apply to Baldor Motor products. Be sure to read and

understand the Safety Notice statements in this manual. For your protection, do not install, operate or
attempt to perform maintenance procedures until you understand the Warning and Caution statements. A
Warning statement indicates a possible unsafe condition that can cause harm to personnel. A Caution
statement indicates a condition that can cause damage to equipment.

Important: This instruction manual is not intended to include a comprehensive listing of all details for all

procedures required for installation, operation and maintenance. This manual describes general
guidelines that apply to most of the motor products shipped by Baldor. If you have a question
about a procedure or are uncertain about any detail, Do Not Proceed. Please contact your Baldor
distributor for more information or clarification.

G−Series Totally Enclosed Fan Cooled (TEFC) and Totally Enclosed Air Over (TEAO) motors are
designed and built to provide you with a drive power system composed of matched components. Such
a system is capable of delivering the horsepower, torque, speed and power efficiency characteristics
that are needed for reliable production machinery.

This systems approach was used not only in the design of the motor, but also in the state of the art
manufacturing used to produce and test these rugged and dependable machines. It extends from the
major assemblies such as rotors, stators, enclosures and insulation systems, to the smallest
component carefully selected and mated for optimum performance. The result is a product that is
indeed, more than a motor more like a system.

G−Series TEFC Motors are designed for easy disassembly, reassembly, and inspection.
These common accessories are available:

S

Bearing temperature detectors

S Winding temperature detectors

S Space heaters

S Lightning arrestors

S Surge capacitors

S Vibration monitors

S Special conduit boxes

This manual contains the information that you need to get the most out of your G−Series TEFC Motor.
Please read it carefully and thoroughly before unpacking and installing motor.

Safety Notice: This equipment contains high voltage! Electrical shock can cause serious or fatal injury.

Only qualified personnel should attempt installation, operation and maintenance of
electrical equipment.

Be sure that you are completely familiar with NEMA publication MG-2, safety standards
for construction and guide for selection, installation and use of electric motors and
generators, the National Electrical Code and local codes and practices. Unsafe
installation or use can cause conditions that lead to serious or fatal injury. Only qualified
personnel should attempt the installation, operation and maintenance of this equipment.

1-2 General Information MN409

WARNING: Do not touch electrical connections before you first ensure that power has been disconnected.

Electrical shock can cause serious or fatal injury. Only qualified personnel should attempt the
installation, operation and maintenance of this equipment.

WARNING: Be sure the system is properly grounded before applying power. Do not apply AC power before

you ensure that all grounding instructions have been followed. Electrical shock can cause serious
or fatal injury. National Electrical Code and Local codes must be carefully followed.

WARNING: Avoid extended exposure to machinery with high noise levels. Be sure to wear ear protective

devices to reduce harmful effects to your hearing.

WARNING: This equipment may be connected to other machinery that has rotating parts or parts that are

driven by this equipment. Improper use can cause serious or fatal injury. Only qualified
personnel should attempt to install operate or maintain this equipment.

WARNING: Do not by-pass or disable protective devices or safety guards. Safety features are designed to

prevent damage to personnel or equipment. These devices can only protection if they remain
operative.

WARNING: Avoid the use of automatic reset devices if the automatic restarting of equipment can be

hazardous to personnel or equipment.

WARNING: Be sure the load is properly coupled to the motor shaft before applying power. The shaft key

must be fully captive by the load device. Improper coupling can cause harm to personnel or
equipment if the load decouples from the shaft during operation.

WARNING: Use proper care and procedures that are safe during handling, lifting, installing, operating and

maintaining operations.
Improper methods may cause muscle strain or other harm.

WARNING: Before performing any motor maintenance procedure, be sure that the equipment connected to

the motor shaft cannot cause shaft rotation. If the load can cause shaft rotation, disconnect
the load from the motor shaft before maintenance is performed. Unexpected mechanical
rotation of the motor parts can cause injury or motor damage.

WARNING: Disconnect all electrical power from the motor windings and accessory devices before

disassembly of the motor. Electrical shock can cause serious or fatal injury.

WARNING: Do not use non UL/CSA listed explosion proof motors in the presence of flammable or

combustible vapors or dust. These motors are not designed for atmospheric conditions that
require explosion proof operation.

WARNING: Motors that are to be used in flammable and/or explosive atmospheres must display the UL

label on the nameplate along with CSA listed logo. Specific service conditions for these motors
are defined in NFPA 70 (NEC) Article 500.

WARNING: UL Listed motors must only be serviced by UL Approved Authorized Baldor Service Centers if

these motors are to be returned to a hazardous and/or explosive atmosphere.

WARNING: This equipment is at line voltage when AC power is connected. Disconnect and lockout all

ungrounded conductors of the ac power line before proceeding. Failure to observe these
precautions could result in severe bodily injury or loss of life.

WARNING: Rotating parts can cause serious or fatal injury. If relubrication is performed with the motor

running, to avoid injury do not contact any rotating parts.

WARNING: Solvents can be toxic and/or flammable. Follow manufacturer’s safety procedures and

directions. Failure to observe this precaution could result in bodily injury.

Continued on next page.

Section 1
General Information

General Information 1-3MN409

Safety Notice Continued

WARNING: Use of an air jet may cause flying debris and generate particulate matter. Wear suitable skin,

eye and respiratory protection. Failure to observe this precaution may result in bodily injury.

WARNING: Space Heaters operate at line voltage. Disconnect power to space heaters before performing

maintenance work on motor. Failure to observe this precaution could result in severe bodily
injury or loss of life.

WARNING: Thermostat contacts automatically reset when the motor has slightly cooled down. To prevent

injury or damage, the control circuit should be designed so that automatic starting of the motor
is not possible when the thermostat resets.

Caution: To avoid damage to the windings do not use air pressures greater than 30 psi (200 kPa). Avoid

directing the air in such a way that the dirt will be blown into inner crevices.

Caution: To prevent premature equipment failure or damage, only qualified maintenance personnel

should perform maintenance.

Caution: Do not over−lubricate motor as this may cause premature bearing failure.

Caution: Over−lubricating can cause excessive bearing temperatures, premature lubrication breakdown

and bearing failure.

Caution: Do not lift the motor and its driven load by the motor lifting hardware. The motor lifting

hardware is adequate for lifting only the motor. Disconnect the load from the motor shaft
before moving the motor.

Caution: If eye bolts are used for lifting a motor, be sure they are securely tightened. The lifting

direction should not exceed a 20° angle from the shank of the eye bolt or lifting lug. Excessive
lifting angles can cause damage.

Caution: To prevent equipment damage, be sure that the electrical service is not capable of delivering

more than the maximum motor rated amps listed on the rating plate.

Caution: If a HI POT test (High Potential Insulation test) must be performed, follow the precautions and

procedure in NEMA MG1 and MG2 standards to avoid equipment damage.

Caution: Sleeve bearing motors are shipped without oil. To avoid motor damage, do not rotate the shaft

until you have filled the oil reservoirs to the proper level with recommended lubricant.

Caution: To avoid damage to motor bearings, grease must be kept free of dirt. For an extremely dirty

environment, contact your Baldor distributor or an authorized Baldor Service Center for
additional information.

Caution: Do not use solvents containing trichloroethane to clean interior or exterior of motor. Damage

may occur to paint and insulation systems.

If you have any questions or are uncertain about any statement or procedure, or if you require
additional information please contact your Baldor distributor or an Authorized Baldor Service Center.

Receiving Each Baldor Electric Motor is thoroughly tested at the factory and carefully packaged for shipment.

When you receive your motor, there are several things you should do immediately.
Do not unpack until ready for use.

1. Observe the condition of the shipping container and report any damage immediately to the
commercial carrier that delivered your motor.

2. Verify that the part number of the motor you received is the same as the part number listed on your
purchase order.

Section 1
General Information

1-4 General Information MN409

Handling The motor should be lifted using the lifting lugs or eye bolts provided.

1. Eyebolts or lifting lugs are intended

for lifting the motor only with the standard factory installed

accessories such as tachometer, etc., the lifting means on the motor must not be used to lift the
motor plus additional equipment such as gears, pumps, compressors, or other driven equipment.
The lifting means on the motor cannot be used to lift assemblies of motor and other equipment
mounted on a common base.

2. In all cases, care should be taken to assure lifting in the direction intended in the design of the lifting
means. Lift using all lugs provided. Likewise, precautions should be taken to prevent hazardous
overloads due to deceleration, acceleration or shock forces. Angle of lift with rope or chain should
never be less than 45 degrees from the horizontal.

Storage Do not unpack until ready for use. If the motor is not put into service immediately, the motor must be

stored in a clean, dry and warm location. Several precautionary steps must be performed to avoid motor
damage during storage.

Caution: Sleeve bearing motors are shipped without oil. To avoid motor damage, do not rotate the shaft

until you have filled the oil reservoirs to the proper level with recommended lubricant.

1. The motor should be inspected periodically and the insulation resistance checked and recorded
monthly (see Checking Insulation Resistance in section 3). If there is a significant change in
insulation resistance, it should be investigated and corrective action should be taken. Consult your
local Baldor District office for additional data.

2. Do not lubricate bearings during storage. G−Series TEFC anti−friction bearing motors are shipped
with the proper amount of grease in each bearing.

3. At 30 day intervals, remove only enough packing to expose the shaft and remove the shaft shipping
brace, rotate the shaft (by hand) 10 to 15 revolutions. This distributes the grease, preventing bearing
corrosion due to condensation, or to the presence of contaminating gases near the motor. After
rotating the shaft replace protective packing and shaft shipping brace.

4. If the storage location is cold, damp or humid, the motor windings must be protected from moisture.
This can be done by applying power to the motors’ space heater (if available) while the motor is in
storage.

5. If the motor is stored and directly exposed to weather conditions, it is important that the bearing
grease be inspected for the presence of water at the grease drain. If the grease is contaminated with
water, the motor must be disassembled, grease removed from the bearing(s) and housing(s) and
bearing(s) inspected for corrosion. If corrosion is present, the bearing(s) must be replaced. If there is
no corrosion, repack the bearing(s) / housing(s) with grease as instructed on page 13.

6. G−Series motors with oil lubricated sleeve bearings are tested using an oil containing a rust inhibitor.
This additive protects the bearings and associated structural parts from rust and corrosion. Prior to
shipment the oil is drained. A thin film of oil remains on the vital parts providing short term temporary
rust protection.

As soon as the motor has been received, the bearing oil reservoir should be filled to the required oil
level and with the proper oil lubrication. (See Bearing Lubrication for proper type).

Unpacking Each Baldor motor is packaged for ease of handling and to prevent entry of contaminants.

1. To avoid condensation inside the motor, do not unpack until the motor has reached room
temperature. (Room temperature is the temperature of the room in which it will be installed).
The packing provides insulation from temperature changes during transportation.

2. When the motor has reached room temperature, carefully remove the motor from packaging.
Lifting provisions are provided as eyebolts or cast lifting lugs located on top of the motor.
Place a lifting hook in each of the lifting means provided and carefully lift the motor from its packing.
Use a hoist with adequate capacity.

Section 2
Installation & Operation

Installation & Operation 2-1MN409

Overview Before installing the motor, be sure you read Section 1 and become familiar with the Warnings and

Cautions to prevent damage to the motor and prevent injury to personnel. This is extremely important for
a good installation and to ensure trouble free operation.

Installation should conform to the National Electrical Code as well as local codes and practices. When
other devices are coupled to the motor shaft, be sure to install protective devices to prevent future
accidents. Some protective devices include, coupling, belt guard, chain guard, shaft covers etc. These
protect against accidental contact with moving parts. Machinery that is accessible to personnel should
provide further protection in the form of guard rails, screening, warning signs etc.

1. If the motor has been in storage for an extended period or had been subjected to adverse moisture
conditions, check the insulation resistance of the stator winding (see Checking Insulation Resistance
in section 3).

2. Examine the motor nameplate data to make sure it agrees with the power circuit to which it will be
connected. The motor is guaranteed to operate successfully at line frequency not more than 5%, and
line voltage not more than 10%, above or below the nameplate ratings, or a combined variation of
voltage and frequency of not more than 10% above or below nameplate ratings. Efficiency, power
factor and current may vary from nameplate data.

3. Check to make sure that direction of motor rotation is corrected for the intended application.

Location It is important that motors be installed in locations that are compatible with motor enclosure and ambient

conditions. Improper selection of the motor enclosure and ambient conditions can lead to reduced
operating life of the motor. The motor must be located in an environment that satisfies local codes and
National Board of Fire and Underwriter’s regulations.

The following additional considerations should also govern its location.
On Totally Enclosed Fan Cooled (TEFC) motors the installation should be in a location that provides

adequate space for air circulation of the external cooling fan. Exposure to high ambient temperatures,
humidity and atmospheric contamination should be avoided. Acids, alkalis and gases also have
detrimental effects on electrical machinery. The location of installation should be accessible for routine
maintenance and inspection.

If the room is not large enough to have natural ventilation, some external source of forced and filtered air
will be necessary. The room should be such that the heat developed during operation can escape and will
not be recirculated over the equipment.

Permanent handling equipment to facilitate major service and repair without complete disassembly of the
individual units should be considered.

If the motor must be moved or additional handling or shipment of motor be required, be certain to block
the shaft as it was blocked for shipment by the factory. Blocking the shaft, limits the rotor movement both
axially and radially which prevents damage to the bearings.

Foundation The dimensions for mounting are shown on the outline drawing supplied with the motor software and

should be referred to prior to planning of the foundation.
The foundation should consist preferably of solid concrete walls or piers and should be carried down far

enough to rest on a solid sub−base. This base should be sufficient stiffness to prevent vibration and to
insure long, trouble free operation. If necessary, a consulting engineer, who is familiar with foundation
design, should design and supervise its construction.

If the foundation is to be steel girders instead of concrete, the girders should be well braced and
supported by adequate columns to prevent vibration due to resonance. The natural frequencies of the
motor and supporting structure must be at least 20% away from the speed of rotation and twice the speed
of rotation and multiples of the power line frequency.

The size of the foundation is determined by the weight, size and speed of the equipment and by the type
and condition of the underlying soil. The width and length of the foundation are usually made to extend at
least 6 inches (150mm) beyond the equipment on all sides of the base. Increased width and weight are
necessary for operation at higher speeds and for foundations that project above the floor level to give
stability against rocking and resonant vibration.

Large motors are not rigid or self−supporting, and should be uniformly supported. Therefore, when set on
the foundation or base, adequate support should be provided by leveling plates and shims between the
frame and the foundation, at points of loading; Le., under the frame feet, and intersection points of the
beams as well as under long, unsupported sections of the base. The number of shims should be kept to a
minimum. A few thick ones are preferred over many thin ones.

Space should be allowed between the base and foundation for grouting. The concrete surface should be
roughed to provide a good bonding surface.

2-2 Installation & Operation MN409

Pre−Installation Checks The assurance of successful start−up depends upon the use of good handling, inspection,

and installation practices.

Caution: Sleeve bearing motors are shipped without oil. To avoid motor damage, do not rotate the shaft

until you have filled the oil reservoirs to the proper level with recommended lubricant.

Sleeve bearing motors are shipped without oil. Fill the oil reservoirs to the proper level before rotating the
shaft. Failure to observe this precaution could result in damage to or destruction of the equipment.

Before shipment, every motor is given a running test to check operation. Although complete factory tests
have been made, motors should be checked for any change resulting from improper handling during
shipment, storage, installation or by an unsatisfactory foundation. Failure to check or do the necessary
work as mentioned above, could cause misalignment resulting in vibration and premature bearing failure.

Before the motor is checked for alignment, remove all shipping blocks and supports installed at the
factory. The shaft should turn over freely. The degree of accuracy required in the alignment depends on
the rated speed of the machine. The greater the speed, the greater the care and accuracy necessary in
the alignment.

The motor must be level to maintain the proper oil level. Check the driven equipment to make sure that
the motor will be coupled to a level shaft. If necessary, level it up before coupling.

Grouting A good quality commercial non−shrinking type of grouting compound should be used between foundation

concrete and all sole poles.

Doweling & Bolting After proper alignment is verified, dowel pins should be inserted through the motor feet into the

foundation. This will maintain the correct motor position should motor removal be required. (Baldor motors
are designed for doweling.)

1. Drill dowel holes in diagonally opposite motor feet in the locations provided.

2. Drill corresponding holes in the foundation.

3. Ream all holes.

4. Install proper fitting dowels.

5. Mounting bolts must be carefully tightened to prevent changes in alignment. Use a flat washer and
lock washer under each nut or bolt head to hold the motor feet secure. Flanged nuts or bolts may be
used as an alternative to washers.

Coupling

Caution: Do not use the coupling to compensate for poor alignment. This can result in vibration, noise,

coupling wear, overloaded bearings and early failure.

1. In preparation for making the coupling alignment, wash off the rust−protective compound on the
motor shaft and factory−installed couplings with solvent.

2. Fill oil sumps with the recommended oil to the proper level before mounting the coupling.

3. The couplings should be heated for proper mounting. Do not press or drive couplings onto the shaft.

Coupling Alignment

There are a number of different procedures in alignment of the motor to the driven equipment. The end
result depends upon the accuracy of the parts in roundness, flatness, runout of the reference surfaces,
rigidity of the mounting and the skill of the set−up−person. The motor base surfaces must be flat and
parallel to the shafts. Make allowance for inserting shims under the motor to make the elevation
adjustment. The size of the shims’ should be the full length of the motor foot pad, they should be flat, and
free of any burrs. Insert the shims carefully to maintain the foot plane and to avoid bending or twisting the
motor frame. For a poor mounting surface, it may be necessary to machine a shim to compensate for the
slope or surface irregularity. To minimize soft stacking and sponginess associated with excessive layers,
use the thickest shim stock combination with the fewest shims.

Refer to accepted procedures for coupling alignment such as double−dial indicator or laser alignment.
Coupling alignment shall be within the following limits:

S MAXIMUM PERMISSIBLE ANGULAR MISALIGNMENT = .001 inch per inch of coupling hub diameter.
S MAXIMUM PERMISSIBLE PARALLEL MISALIGNMENT = .002 inch TIR (Total Indicated Runout).

Installation & Operation 2-3MN409

Lubrication The lubrication system should be checked in preparation for rotating the shaft during the alignment

operation.

Anti−Friction Bearings (Grease Lubricated)

Bearing chambers are packed with grease during assembly, and do not normally need additional grease
at time of installation, unless the unit has been in storage and installation for 6 months or longer.
Lubricant must be added per Section 4, Maintenance.

Sleeve Bearing (Oil Lubricated)

If the motor has been in storage for six months or more, the bearing oil must be changed per Section 4 for
Standard Conditions.

Sleeve bearing motors are shipped from factory without oil. Fill oil sumps to proper level before rotating
the shaft. Failure to observe this precaution could result in damage to or destruction of the equipment.

To fill sleeve−bearing motor oil reservoirs on motors not equipped with constant level oilers, be sure that
the drain plugs are in place and secure. Fill through filler cap until oil level shows in the oil gauge. Fill oil
to midway point of the gauge. For motors with constant level oilers, refer to the instructions under the
Accessories section.

On motors equipped with circulating oil lube system and adjustable needle valve, valve must be adjusted
or flooding of oil sump may occur. Disconnect valve and adjust to flow rate, pressure, and temperature as
defined on dimension sheet or nameplate. If dimension sheet is not available contact your Baldor District
Sales Office.

Electrical Connection

WARNING: Be sure the system is properly grounded before applying power. Do not apply AC power

before you ensure that all grounding instructions have been followed. Electrical shock can
cause serious or fatal injury. National Electrical Code and Local codes must be carefully
followed.

A main terminal box may be provided for power lines to the stator. Other terminal boxes for all other
electrical connections may be provided. Motor and control wiring, overload protection, disconnects,
accessories and grounding should conform to the National Electrical Code and local codes and practices.

AC Power Connect the motor leads as shown on the connection diagram located on the name plate or inside the

cover on the conduit box. Be sure the following guidelines are met:

1. AC power is within ±10% of rated voltage with rated frequency. (See motor name plate for ratings).

OR

2. AC power is within ±5% of rated frequency with rated voltage.

OR

3. A combined variation in voltage and frequency of ±10% (sum of absolute values) of rated values,
provided the frequency variation does not exceed ±5% of rated frequency.

Grounding Failure to properly ground the motor may cause electrical shock hazard to personnel.

All large motors should be grounded with the grounding conductor equipped with a brazed copper
terminal, or with a suitable solderless terminal fastened to the motor. Soldered terminals should not be
used. A washer should be used between bolt head and terminal lug. The other end should be fastened
with suitable clamps or terminals to rigid metallic conduit or to the nearest available ground. Grounding
conductor size should be in accordance with the following National Electrical Code Table 250−95.
Installation restrictions are listed in Section 250−92.

Section 1
General Information

2-4 Installation & Operation MN409

WARNING: This equipment is at line voltage when AC power is connected. Disconnect and lockout all

ungrounded conductors of the ac power line before proceeding. Failure to observe these
precautions could result in severe bodily injury or loss of life.

First Time Start Up Be sure that all power to motor and accessories is off. Be sure the motor shaft is disconnected from

the load and will not cause mechanical rotation of the motor shaft.

1. Hold down bolts must be tight. Torque hold down bolts as follows:

Frame

Minimum Hold Down

Bolt Torque

G5000/G315 100 Ib.−ft. (136 Nm)

G5800/G40 125 lb.−ft. (170 Nm)

G50 150 Ib.−ft. (204 Nm)

2. If the motor has been idle for a long period of time after installation, check insulation resistance.

3. Check the incoming power to be sure that line voltage, frequency and phase are correct for the
motor (refer to the motor nameplate).

4. Inspect all electrical connections for proper termination, clearance, mechanical strength and
electrical continuity.

5. Be sure all shipping materials and braces (if used) are removed from motor shaft.
a. For sleeve bearing motors check the lubrication system to insure the oil reservoirs and constant

level oilers (when provided) have been filled to the proper oil level with the appropriate oil type.
Do not overfill oil reservoirs.

b. Motors operating with a forced lubrication system must have the forced lubrication system

operating before starting the motor.

6. Manually rotate the motor shaft to ensure that it rotates freely.

7. When the driven machine is likely to be damaged by the wrong direction of rotation, it is best to
uncouple the motor from its load during the check for rotation and/or during the initial start.

Some motors are designed for a single direction of rotation as indicated by nameplates. Running
those units in the wrong direction will reduce airflow causing overheating. Check to see that both the
motor and driven equipment are operating in the correct direction of rotation. If it is necessary to
change rotation, disconnect and lockout all input power and interchange any two input power
phases.

8. Replace all panels and covers.

9. Momentarily apply power and check the direction of rotation of the motor shaft.

10. If motor rotation is wrong, be sure power is off and change the motor lead connections.
Verify rotation direction before you continue.

11. Start the motor and ensure operation is smooth without excessive vibration or noise. If so, run the
motor for 1 hour with no load connected.

12. Check bearing temperatures frequently if bearing temperature detectors are provided. They should
not exceed 195°F (90°C). At initial start, the bearing temperature rate of rise will be high. This rate of
rise should decrease within 30 minutes. If this rate of rise does not decrease or the temperature
exceeds 90°C, stop the motor.

13. Ensure that the protective controls are functioning properly before any prolonged operation.

14. Run the motor for at least two hours.

Installation & Operation 2-5MN409

Coupled Start Up This procedure assumes a coupled start up. Also, that the first time start up procedure was

successful. Read and fully understand each of the steps in the following procedure before attempting to
start the motor.

1. Disconnect and lockout the power source. Ensure no power is applied to the motor.

2. After a successful uncoupled start, assemble the coupling and lubricate with the manufacturer’s
recommended lubricant. Check to see that the coupling is not binding.

3. After the coupling has been assembled and lubricated, repeat steps 11 through 14 under First Time
Start Up. Check to see that the driven equipment is not transmitting vibration back to the motor
through the coupling or the base.

4. Check to see that coupling guards and other protective enclosures are not blocking the ventilating air
over the motor and exhaust openings.

5. When alignment is correct and motor is properly lubricated, prepare for no load run uncoupled
start−up. The coupling should be uncoupled and a solo plate should be installed if required.

6. Inspect the motor carefully. Make the initial start by following the regular sequence of starting
operations in the control instructions.

7. After starting, check that the motor is running smoothly. If the motor shows excessive vibration, shut
down immediately and investigate. Check for coupling and key unbalance, lack of lubrication, foot
planarity and structural resonance.

RPM

Max. Vibration Amplitude (Peak to Peak on Bearing Housing)

3000−3600 Incl. .75 mil (.20 in/sec peak)

1800−Slower 1.0 mil (.20 in/sec peak)

Jogging and Repeated Starts

Repeated starts and/or jogs can greatly reduce the life of an induction motor. If it is necessary to
repeatedly start or jog a motor, check the application with your local Baldor District office.

At ambient temperature, the motor is normally capable of making two starts in succession and coasting to
rest between starts.

The motor is also capable of making one start at its rated load operation temperature. For cooling time
required before additional starts can be made consult your local Baldor District office or the motor starting
nameplate if one is provided.

If more starts than defined above are attempted in shorter period of time, severe damage to the motor
electrical windings and rotor may result.

The starting conditions listed above apply only if the inertia of the connected load, the load torque during
acceleration, the applied voltage, and the starting method are those for which the motor was designed.
For starting situations not covered here, consult your local Baldor District office before proceeding. Refer
also to the motor nameplate which may list starting conditions.

2-6 Installation & Operation MN409

Section 3
Maintenance & Troubleshooting

Maintenance & Troubleshooting 3-1MN409

G−Series AC motors when properly applied, require minimal routine maintenance. Since clearances and
fits are precisely machine, no periodic mechanical adjustments are required. Like any precision machine,
periodic inspection and simple routine maintenance will prolong your motor’s life and help spot potentially
damaging conditions. The minimal time spent performing the simple procedures below cannot begin to
compare with the cost of lost productivity and time consuming major repairs incurred through neglect or
routine inspection and maintenance.
In addition, the following should always be observed.

S Provide adequate ventilation.

S Keep air and exhaust openings clean and free of obstructions.

S Avoid sharp blows and excessive axial thrust loads on the output shaft.

S Maintain proper lubricant level (check weekly on oil lubricated units).

Caution: Do not use solvents containing trichloroethane to clean interior or exterior of motor. Damage

may occur to paint and insulation systems.

Periodic Inspection Inspections are important to the proper operation and maintenance of a motor, should occur

every 3 months (or 500 operating hours whichever comes first).

1. Listen for any abnormal noises and check cause immediately.

2. Check voltage and frequency variations. Unbalanced voltage or single phase operation of poly

phase motors will cause excessive heating and ultimately failure. Only a slight unbalance of
voltage applied to a poly phase motor will cause large unbalance currents and result in
overheating.

3. Check power supply total harmonic distortion to avoid overheating.

4. Periodic checks of phase, voltage, frequency, and power consumption of an operating motor

are recommended.

5. Check for excessive vibration.

6. Check all air passages and ensure that they are not blocked or clogged.

7. Check to see that all covers are in place and secure.

8. Disconnect and lockout the power source. Ensure no power is applied to the motor.

9. Provide adequate ventilation. If the motor is not properly ventilated, overheating can occur and

cause early motor failure.

10. Keep air and exhaust openings clean and free of obstructions.

11. Avoid sharp blows and excessive axial thrust loads on the output shaft.

12. Maintain proper lubricant level (check weekly on oil lubricated units).

13. Check all electrical connectors to be sure that they are tight.

14. Check for proper lubrication. For sleeve bearing motors check oil level. The oil level must be at

the midpoint of sight gauge when the motor is at rest and in operation.

15. Check bearing temperature rise.

16. When provided, check that constant level oilers have oil in them.

Check that cap on oiler is screwed on tightly. Make sure the oil is clean.

These checks can also provide an excellent indication of the load from the driven equipment.
Comparisons of this data with previous no load and full load power demands will give an indication of the
performance of the driven machine.

3-2 Maintenance & Troubleshooting MN409

Bearing Lubrication

Depending on the application and rating, the motor is equipped with either anti−friction or sleeve type
bearings. When properly cared for (ie., inspection and lubrication) bearings will provide years of
uninterrupted service. Use one of the following lubrication procedures, depending on the type of bearings
with which your motor is equipped.

Anti−Friction Bearing (Grease Lubricated)

G−Series AC motors are designed with the Baldor direct grease system which routes new grease directly
into the bearing.

The relubrication periods shown in Table 3-2 are offered as a guide for varying service conditions,
speeds, bearing types and operating hours.

Cleanliness is important in lubrication. Any grease used to lubricate anti−friction bearings should be fresh
and free from contamination. Similarly, care should be taken to properly clean and grease inlet areas of
the motor to prevent grease contamination.

Mixing of lubricants must not be done. Lubricants from different manufacturers and of different
compositions may not be compatible, resulting in inadequate lubrication and bearing failure. If a lubricant
other than that listed on the motor nameplate and/or this instruction manual is desired to be used, first
consult your local Baldor District office for approval and instructions. Do not use automotive greases,
greases with EP additives or greases other than those specifically listed on the motor lubrication
nameplate and this instruction manual. Failure to follow these instructions may result in lubrication
breakdown and bearing failure.

Recommended Lubricant

Refer to motor nameplate. Use only clean, fresh grease from clean containers.
A high grade ball or roller bearing polyurea base hydrocarbon grease should be used.
Recommended grease for standard service conditions is Polyrex EM (Exxon Mobil).
Do not mix greases unless compatibility has been checked and verified.
Contact your Baldor District Office if you have compatibility questions.

Equivalent and compatible greases include:
Texaco Polystar, Rykon Premium #2, Pennzoil Pen 2 Lube and Chevron SRI.

Lubrication Instructions

1. Select Service Conditions from Table 3-1.

2. Select Lubrication Frequency and recommended volume fill from Table 3-2.

Table 3-1 Service Conditions

Standard
Conditions

Eight hours per day, normal or light loading,
clean ambient air at 40°C (100°F) maximum

Severe
Conditions

Twenty four hours per day operation . or shock loading, vibration,
ambient air containing dirt

or dust at 4050°C (100−120°F)

Extreme
Conditions

Heavy shock or vibration, and dust

Table 3-2 Relubrication Intervals

Anti−Friction Bearings

Speed (RPM) Standard Conditions Severe Conditions Extreme Conditions

3000 6 months 3 months 2 months
3600 6 months 3 months 3 months

Roller Bearing (G40 Motors)

Less than 3000 4 months 2 months 1.5 months

Maintenance & Troubleshooting 3-3MN409

G40, G50 G315, G5000, G5810 Frames

Recommended Lubricant

Refer to the motor Lubrication nameplate for the type of lubricant to be used. If there is no Lubrication
nameplate on the motor, use the following lubricants:

G5000 & G315 Frames− Polyurea base hydrocarbon oil grease

G5810 & G40 Frames− Polyurea base hydrocarbon oil grease

G50 Frame− Lithium base hydrocarbon oil grease

Note: Lubrication nameplate on the motor takes precedent over this data. Use only clean, fresh grease

from clean containers.

Grease Lubrication Instructions

Anti−friction bearings may be lubricated with the motor running or stationary. However, stationary with the
motor warm is the preferred method.

WARNING: Rotating parts can cause serious or fatal injury. If relubrication is performed with the motor

running, to avoid injury do not contact any rotating parts.

1. Locate the grease inlet, remove all caked grease and dirt from the fitting.

2. Remove relief plug. If grease is caked around the plug, clean with a wooden stick or suitable

tool. If severe caking appears at the plug, run the motor until the bearing housing is warm,
permitting free flow of grease through the housing.

3. Add the recommended volume of the recommended lubricant per the motor Lubrication

Nameplate or Table 3-3 using a hand operated grease gun.

4. Start the motor and run with the relief plug open for several minutes until all excess grease is

relieved.

5. Replace plugs and wipe off any excess grease.

Table 3-3 Relubrication Volume (cubic inches; Motor Maximum speed − RPM)

Frame Size

3000 & 3600 Less Than 3000

G5000 & G315 1.5 3.0

G5810 & G40 1.5 3.0

G50 4.0

Data contained on a lubrication nameplate on the motor takes precedent over this Table.

Sleeve Bearings (Oil Lubricated) Instructions

Oil should be changed periodically, or immediately if discolored or contaminated. Follow the schedule on
the motor nameplate, or if not known use the Table 3-4 schedule.

Table 3-4 Lubrication Schedule

Speed − RPM Service Conditions Change Oil (Hours)

All Speeds Standard 8800
All Speeds Severe 4400

Standard Conditions: Normal or light loading, Clean, 0°F (−18°C) to 104°F (40°C) ambient.

Severe Conditions: Medium shock/vibration, Dirt/Dust,

−20°F (−30°C) to 120°F (50°C) ambient.

Lubricant for sleeve bearing motors should be selected from Table 3-5.

Table 3-5

Ambient Temperature

Speed − RPM

1200 or less Greater than 1200

0 to120°F (−18 to 50°C) 300 SUS (68 cST) 150 SUS (32 cST)

−20 to 50°F (−30 to 10°C) 150 SUS (32 cST) 90 SUS (18 cST)

3-4 Maintenance & Troubleshooting MN409

S For higher temperature, oil coolers should be used.

S For lower temperatures, heaters should be used to assure adequate starting temperatures.

Viscosity in SUS (centistokes) at 100°F (37.8°C).

Pour point: Below minimum starting temperature.

Quality: Use a good grade of turbine type oil, with rust, foam, and oxidation inhibitors.

Avoid automotive oils or additives unless specifically recommended by the oil manufacturer.

Oil Change Procedure

1. Disconnect and lockout the power source. Ensure no power is applied to the motor.

2. Remove the drain plug, located at the bottom of the bearing housing.
For the non−drive end, the oil drain pipe is labeled on the fan cover.

3. If the oil appears to be contaminated, the housing can be flushed out by filling with fresh oil
and draining again until oil is clean.

4. Replace plug and fill at oil fill to the sight gauge mid point.

5. Tighten fill cap and plugs, fill constant level oiler if provided.

6. Start unit and observe to be assured of no oil leakage and level does not drop.

G50 Sleeve Bearing & Cartridge Removal Instructions

1. Disconnect and lockout the power source. Ensure no power is applied to the motor.

2. Remove the fan cover/air scoop and accessories (forced lubrication plumbing) that are
assembled to the end shield and bearing housing.

3. Loosen bolts and remove protective cover bolted to flange of the end shield.

4. The bearing housing must be disassembled from the end shield before removing the end shield
from the frame.

5. Remove drain plug at bottom of bearing housing and drain oil from the reservoir.

6. Loosen and remove the bolts at the split line of the bearing housing.

7. If the motor has insulated bearings and meets API−541 , a machined seal will be assembled
outboard of the bearing housing. The seal must be dissembled from the bearing housing before
removing the top half of the bearing housing. The seal is insulated from the bearing housing
with a non−split gasket. The bearing housing top half can not be removed unless the seal and
gasket are disassembled from the bearing housing.

8. Use the lifting eye bolts, lift the bearing housing top half straight up and pull forward away from
the bearing area to clear the end shield. Insure that the bearing and seals are cleared before
moving the bearing housing top half forward.

9. Lift the upper half of the bearing liner and remove from bearing housing.

10. Loosen and remove the bolts at the split line of the oil ring.

11. Remove oil ring.

12. Disassemble the garter springs that encircle the labyrinth seals (inboard and outboard).

13. Lift and remove the upper half of each seal. Rotate the lower half out of the seal carrier.

Note: The labyrinth seals must be assembled so that the

locking tabs will be in the 9:00 position. The

drain back holes in the seal face must face towards the oil sump

and be located in the 6:00

position.

14. Disconnect and remove RTD’s from the lower half of the bearing liner.

15. Use hoist, jack or a non−metallic sling around the shaft to lift the shaft off the lower half of the
bearing liner. Roll the lower half of the bearing liner out of the bearing housing.

Maintenance & Troubleshooting 3-5MN409

16. Loosen and remove the bolts securing the bottom half of the bearing housing to the end shield.
Use eye bolts and hoist to remove the bottom half of housing. Shims for axial location of the
shaft are located between the lower bearing housing and end cap machined fits.
Note their location for reassembly.

17. The inboard machined seal, outboard seal carrier, and bolt on baffle are still attached to the
bearing housing. These parts can be removed by loosening all bolts and disassembling.

18. For reassembly perform the above listed steps in reverse order. Assemble both the bottom
and top half of the seals. Press up on the bottom half of the outboard seal and baffle so that
there is no clearance between the seal and shaft at the bottom. Make sure that the clearance
from side to side is symmetric.

19. All machined split line surfaces of the bearing housing and seals must be coated with a sealing
compound (Curil Tor Permatex #3). Also apply seal compound to the flange of the machined
seals and seal carrier.

G50 Sleeve Bearing Replacement

1. The sleeve bearing may be replaced without disturbing the setup and uncoupling from the
driven equipment. Remove the top and bottom bearing liners at stated in “G50 Sleeve Bearing
& Cartridge Removal Instructions”.

2. Make sure that the shaft bearing shoulders and journal are free of nicks and burrs before
replacing bearing. Dress shaft with emery cloth or stone as necessary. Clean the shaft and oil
sump thoroughly.

3. Apply a coating of oil to the bearing journal.

4. Inspect the replacement bearing for nicks and damage. The bearing may be packed in a waxy
rust inhibiting compound. Remove all wax from bearing surfaces using solvent. Dry bearing
before assembling in housing. The bearings are spherical self seating. Apply a coat of oil to the
outside diameter of the bearing liner and also to the bearing housing bore. Do not scrape the

bearing Babbitt surface for seating.

5. Reassemble the motor. Apply sealant to the split line of bearing housing seals.

6. Fill oil reservoir so that oil is at the midway point in the sight gauge.

7.

Slowly rotate the shaft to insure the bearings and seals are seated properly.

G5000, G315, G5810 and G40 Sleeve Bearing & Cartridge Removal

1. Disconnect and lockout the power source. Ensure no power is applied to the motor.

2. Remove the fan cover/air scoop and accessories (forced lubrication plumbing) that are
assembled to the end shield and bearing housing. Loosen bolts and remove protective cover
bolted to flange of the end shield.

3. The bearing housing must be disassembled from the end shield before removing the end shield
from the frame.

4. Remove drain plug at bottom of bearing housing and drain oil from the reservoir.

5. Loosen and remove the bolts at the split line of the bearing housing. Remove top half of
bearing housing.

6. Pry slots are provided on the outboard bearing face to facilitate removing top of the bearing
housing.

7. Using hand pressure, separate the bearing halves. (Bearings halves are doweled together).

Note: Some models are equipped with socket head screws in addition to the dowels. These screws must

be removed before attempting to remove bearing top half.

8. Remove top half of bearing and bearing anti−rotation keying devices from bearing housing.

9. Remove Bearing RTD’s if supplied.

10. Using a rope or sling (Nonmetal) around the shaft, raise it just high enough to be able to spin
out the bottom half of the bearing.

3-6 Maintenance & Troubleshooting MN409

Note: Shims used for axial float are located on the outboard end of the bearing in the housing. Remove

and note the quantity used at each end.

11. Remove the bottom half of bearing and gently lower shaft.

12. To remove bottom half of bearing cartridge, use eye bolts to support weight of cartridge and
then remove mounting bolts.

13. For reassembly perform the above listed steps in reverse order.

14. All machined split line surfaces of the bearing housing and seals must be coated with a sealing
compound (Curil Tor Permatex #3).

G5000, G315, G5810 and G40 Sleeve Bearing Replacement

1. Remove bearing as listed in section “G5000, G315, G581 0 and G40 Sleeve Bearing and
Cartridge Removal”.

2. Check to see that bearing journal and shoulders are free of nicks and burrs; dress with rubber
stone or replace as necessary.

3. Using a clean lint free cloth, wipe bearing journal and bearing clean and dry. Shaft and bearing
bore must be free of oil.

4. Raise the shaft as required to reassemble bearing. Install the bottom half of the bearing.

5. Gently lower the shaft until it is in its final position.

6. Assemble top half of bearing.

7. Reassemble parts in reverse order of removal. Make sure dowel pins are engaged in top and
bottom halves of housing.

8. By hand (or suitable wrench) slowly rotate the shaft 2 turns in each direction.

9. Remove bearing as listed in section “G5000, G315, G581 0 and G40 Sleeve Bearing and
Cartridge Removal”. Inspect bore of both bearing halves for burnished (shiny) areas.
A correct burnish pattern is:

Top half of bearing − no burnished areas
Bottom half of bearing − burnish area symmetric about the 6:00 position, one to

two inches wide, covering approximately 70% of the axial length of the bearing bore.

10. If the correct burnish pattern is not found perform the following:

a. Using the proper bearing scraping tools and/or a nonmetallic fiber pad, remove the highly

burnished areas.

b. Clean the bearing and shaft journal with a film free solvent such as denatured alcohol.

11. Repeat steps 3−10 until the correct burnish pattern is obtained.

12. Wipe bearing and journal and pour fresh clean oil on bearing journal and over bearing. Be sure
to cover both inside and outside diameters with oil. Install bottom half of bearing. Use caution
to prevent damage to bearing and to prevent dirt from contaminating bearing surface.

13. Replace anti−rotation keys. Tabs to prevent axial bearing movement should be install pointing
toward the bearing.

14. Assemble top half of bearing.

15. Reassemble parts in reverse order of removal. Make sure dowel pins are engaged in top and
bottom halves of housing. Apply a sealing compound (Curil T or Permatex #3) to faces of lower
bearing housing.

Maintenance & Troubleshooting 3-7MN409

Sleeve/Anti−Friction Bearing Bracket Removal

1. For anti−friction bearing motors the inner cap bolts must be removed before removing the end
shield.

2. For sleeve bearing motors the bearing cartridge must be removed before disassembly of the
end shield. (See G5000, G315, G5810 and G40 Sleeve Bearing & Cartridge Removal).

3. Remove all bolts that secure the end shield to the frame.

4. Using a hoist, support the bracket.

5. To remove the G50 bracket from rabbet fit, jacking holes have been provided next to the four
bracket bolts located at 45°. Tighten jack bolts evenly to avoid axial misalignment of the end
shield. To remove the G5000, G315, G5810 and G40 brackets from the rabbet fit, pry bar slots
have been provided on the lugs.

Anti−Friction Bearing Removal/Replacement

1. Remove the end shield (see Sleeve/Anti−Friction Bearing Bracket Removal).

2. The bearing can now be removed by using a conventional bearing puller with the puller arms
located behind the bearing race. Protect the shaft center by using a spacer block of bass or
some other soft material between the shaft and bearing puller.

3. Clean and inspect all parts. Remove all old grease.

4. All shaft bearing shoulders and journals should be free of nicks before replacing bearing.
Dress shaft with emery cloth or stone as necessary.

5. Heat bearing to 250°F (120°C) for at least 30 minutes.

6. Place bearing onto shaft. Make certain that the bearing is contacting the locating shoulder on
shaft. Do not use impact force on bearing.

7. Let the bearing cool. Grease the outboard side cavity of the bearing 100%. Grease inner caps
and bracket bearing housing to 60% full.

8. Assemble end shield in reverse order. (See Sleeve/Anti−Friction Bearing Bracket Removal).

Rotor And Stator Removal

Consult your local Baldor District office for proper removal procedures.

Winding Maintenance

WARNING: Solvents can be toxic and/or flammable. Follow manufacturer’s safety procedures and

directions. Failure to observe this precaution could result in bodily injury.

Caution: Do not use solvents containing trichloroethane to clean interior or exterior of motor. Damage

may occur to paint and insulation systems.

Disconnect and lockout the power source. Ensure no power is applied to the motor. To inspect the ends
and outside surface of the windings, remove the brackets from the motor. Inspection of these portions of
the windings will provide a good indication of their general condition. To thoroughly inspect and clean the
windings it may be necessary to remove the rotor.

There are numerous methods for cleanings windings. The following methods are most commonly used,
in order of preference.

Note: Before cleaning the windings check for loose blockings, evidence of damage to insulation,

distortion or movement of coils, etc. If any of these conditions exist, contact your local Baldor
District office for recommendations.

Dry Wiping

This method is satisfactory when the surfaces to be cleaned are accessible and when only dry dirt is to
be removed. Use a clean dry, lint free cloth. The lint will adhere to the insulation and increase dirt
collection. Lint is particularly objectionable on high voltage insulation systems as it tends to concentrate
corona discharge.

3-8 Maintenance & Troubleshooting MN409

Brushing and Suction Cleaning

Remove the dry dust and dirt by brushing with a bristle brush, followed by a vacuum suction cleaning.
DO NOT USE WIRE BRUSHES.

Blowing

WARNING: Use of an air jet may cause flying debris and generate particulate matter. Wear suitable skin,

eye and respiratory protection. Failure to observe this precaution may result in bodily injury.

Caution: To avoid damage to the windings do not use air pressures greater than 30 psi (200 kPa). Avoid

directing the air in such a way that the dirt will be blown into inner crevices.

Dry Dirt and dust can be removed from inaccessible crevices by using a jet of low pressure, oil free
compressed dry air.

Solvent Cleaning

Caution: Do not use solvents containing trichloroethane to clean interior or exterior of motor. Damage

may occur to paint and insulation systems.

Cleaning With Water And Detergent

Windings can be cleaned by hose washing or by pressure spray from a low pressure steam generator or
shop steam line.

Caution: To avoid damage to the windings do not use air pressures greater than 30 psi (200 kPa). Avoid

directing the air in such a way that the dirt will be blown into inner crevices.

Oil, grease, tar and wax can be removed by adding a Nonconductive Detergent to the wash water.
After washing, it is necessary to dry the windings in an oven. (See “Checking Insulation Resistance”)

Reconditioning (Re−impregnating) Windings

If after cleaning with solvent or water and detergent, the insulation shows signs of dryness, it may be
necessary to re−impregnate the windings. Consult your local Baldor District office.

Checking Insulation Resistance

If the motor has been in storage for an extensive period or has been subjected to adverse moisture
conditions, check the insulation resistance of the stator winding with an insulation resistance meter.

The minimum insulation resistance (RM) can be determined from the following formula:

RM = KV + 1

Where

RM = Minimum insulation resistance in mega ohms at 40°C of the entire machine winding.

KV = Rating machine potential, in kilovolts.

For machines in good condition, insulation and resistance readings of 10 to 100 times RM are common.
If the insulation resistance is lower than that calculated from the formula, the windings should be dried
out as follows:

Bake in an oven (preferably a circulating air oven) at a temperature not over 90°C until insulation
resistance remains constant.

Maintenance & Troubleshooting 3-9MN409

Table 3-6 Troubleshooting Guide

PROBLEM POSSIBLE CAUSE CORRECTIVE ACTION

Motor will not start Motor improperly connected

Incorrect Line Voltage
Overload relay tripped
Fuses blown or defective
Open circuit in stator or rotor
Short circuit in stator
Grounded Winding

Check motor connection and control connections
Check nameplate for required voltage
Correct and reset
Replace fuses
Check for open circuit
Check for short circuit
Check for ground

Motor noisy Winding single phased

Loose mounting
Noisy bearing
Coupling halves loose

Vibration

If winding is single phased, unit will not start.
Stop unit and try to reset

Check and correct
Check and replace
Inspect alignment and tighten

Check alignment with driver connected
Check feet planarity

Correct balance of motor if necessary
Check key unbalance on coupling.

Excessive Bearing
Temperature
(anti−friction bearing)

Inadequate lubrication
Coupling misalignment
Inadequate internal clearance
Inadequate ventilation

Add lubricant per nameplate instructions
Realign unit
Incorrect replacement bearing − consult factory
Clean filters, check to see if louvers are blocked

Excessive Bearing
Temperature
(sleeve bearing)

Inadequate oil supply

Excessive end thrust
Contaminated oil

Tight clearance
Oil rings not functioning

Bearing material wiped
Rough shaft or corrosion
Bearing Misalignment
Coupling misalignment
Shaft current

Refer to nameplate requirements and correct
Check for proper lubrication, oil level, leaks

Check alignment and coupling float
Drain and refill, change filters in flood lube system

Inspect for source of contamination
Check bearing bore and shaft O.D for proper clearance.
Check for damage, check roundness and for burrs − repair or

replace if necessary
Dress, scrape and refit.
Dress and polish shaft
Realign bearing or reseat bearing
Realign motor
Insulate bearing and isolate shaft from ground

Excessive Temperature Overload

Restricted ventilation
Electrical

Reduce load to nameplate rating or replace with larger unit
Check openings and duct work for obstructions and correct
Check for grounded or shorted coils and unbalanced voltages

between phases

Oil Leak
(sleeve bearing units)

Overfilled
Seals not secured properly
Pipe fittings loose
Bearing air pressure equalizer vent

passage clogged
Wrong sealing compound used on

bearing cap surface

Drain to proper level or adjust oiler elevation
Tighten
Tighten or replace worn threaded parts
Clear out passage

Use Permatex Aviation type No. 3 or other non−hardening gasket
sealer

Oil Leak (Flood
Lubrication System)

To much oil flow in pressure lube
system

Air pressure unbalanced

Reduce flow to recommended level on nameplate

Clean venting pipes

Excessive Vibration Coupling misalignment

Coupling , Coupling key or Rotor
Unbalance

Foundation resonance structure
improperly designed

Worn bearing
Coupled equipment

Realign to operating condition
Rebalance

Make adjustments to foundation

Replace bearing if oversize
Check motor vibration uncoupled, if necessary rebalance

equipment

3-10 Maintenance & Troubleshooting MN409

Section 4
Optional Accessories

Optional Accessories 4-1MN409

The owner is responsible for conformance to national electric code and all other applicable local codes
and practices. Refer to Safety Notice in Section 1 of this manual.

Note: Motor is equipped with the following accessories only if ordered with the motor.

Winding Resistance Temperature Detector RTD

Purpose

To measure or monitor winding temperature during operation.

Principle of Operation

The RTD uses a wire wound in a flat ribbon coil. It is wound so that it is a non−inductive device. Its mode
of operation is that of a linear change in resistance with temperature.

Customer Interconnect

RTD leads are supplied in a separate conduit box. Leads are tagged and connected to a terminal block.
One side of the customer’s bridge circuit must be grounded. This can be done either at the motor
terminal box or at the instrumentation end of the circuit. Voltages that might appear on the circuit will then
be passed to ground.

Remarks

1. Can provide either continuous temperature measuring or temperature monitoring.

2. Needs a separately mounted control and power source to read temperature or to provide a means
for relay operation (for either alarm or motor shut down features. )

3. Temperature can be monitored using an ohm meter or a resistance bridge and converting the
resistance to temperature.

4. Will respond thermally to normal load and temperature changes, but not fast enough to provide
locked rotor protection.

Winding Thermostat

Purpose

To indicate the winding temperature has exceeded normal operating temperatures.

Principle of Operation

The thermostat uses a bi−metal snap action disc to operate a set of contacts. The operating temperature
is factory selected and non−adjustable. The contacts can be wired directly to a relay to provide either
alarm indication or motor shut down features. Means of temperature measuring or monitoring cannot be
provided with this device. Refer to lead tags tor voltage and current limitations of contacts.

Customer Interconnect

Leads terminate in a separate conduit box. Leads are tagged.

Remarks

1. Cannot be used to measure or monitor temperatures.

2. Can be directly wired to motor starter hold in coil relay to provide motor shut down due to excessive
temperature.

3. Can be wired directly to an alarm circuit without the use of a separate relay.

4. Can be used for AC or DC operation.

5. The thermostat provides a thermally automatic reset feature. The snap action automatic reset
feature can cause difficulty in troubleshooting unless it is connected to a manual reset relay.

6. Will respond thermally to normal load / temperature changes; however will not respond fast enough
to provide locked rotor protection.

4-2 Optional Accessories MN409

Winding Thermocouple − TIC

Purpose

To measure or monitor winding temperature.

Principle of Operation

The TIC uses a junction of two dis−similar metals to generate a voltage which varies with change in
junction temperature.

Customer Interconnect

Using same type of TIC wire, connect to leads supplied in separate conduit box. Leads are tagged.

Remarks

1. Can provide either continuous temperature measuring or temperature monitoring.

2. Can measure temperature by using a potentiometer and converting from voltage to temperature by
using proper conversion tables.

3. Needs separately mounted control and power source to read temperature or to provide a means of
relay operation for either alarm or motor shutdown features.

Winding Thermistors

Purpose

To indicate the winding temperature has exceeded normal operating temperatures.

Principle of Operation

Device is a semiconductor that changes its resistance abruptly at a certain temperature. The change is
used to trigger a switching action in an external control which provides an alarm or shutdown signal.

Customer Interconnect

Thermistor leads are brought to a terminal strip located on the coil head. Separate leads continue to
controller, located in the accessory conduit box, where customer connections are made.

Remarks

Cannot be used to measure or monitor winding temperatures. Similar to thermostat providing a switching
action to alarm or shutdown. Will not provide locked rotor protection.

Bearing Resistant Temperature Detector − RTD

Purpose

To measure or monitor bearing temperature during operation.

Principle of Operation

The RTD uses a wire wound in a coil. It is wound so that it is a non−inductive device. Its mode of
operation is that of a linear change in resistance with temperature.

Customer Interconnect

A terminal strip is supplied inside a conduit box. Leads are tagged.

Remarks

1. Can provide either continuous temperature measuring or temperature monitoring.

2. Needs a separately mounted control and power source to read temperatures or to provide a means
or relay operation for either alarm or motor shut down features.

3. Temperature can be monitored using an ohm meter or a resistance bridge and converting the
resistance (after subtracting led resistance) to temperature by using the appropriate conversion
tables for the element.

Optional Accessories 4-3MN409

Suggested bearing and winding RTD setting guidelines

Most large frame AC Baldor motors with a 1.15 service factor are designed to operate
below a Class B (80°C) temperature rise at rated load and are built with a Class H
winding insulation system. Based on this low temperature rise, RTD (Resistance
Temperature Detectors) settings for Class B rise should be used as a starting point.
Some motors with 1.0 service factor have Class F temperature rise.

The following tables show the suggested alarm and trip settings for RTDs. Proper
bearing and winding RTD alarm and trip settings should be selected based on these
tables unless otherwise specified for specific applications.

If the driven load is found to operate well below the initial temperature settings under
normal conditions, the alarm and trip settings may be reduced so that an abnormal
machine load will be identified.

The temperature limits are based on the installation of the winding RTDs imbedded in
the winding as specified by NEMA. Bearing RTDs should be installed so they are in
contact with the outer race on ball or roller bearings or in direct contact with the sleeve
bearing shell.

Winding RTDs − Temperature Limit In 5C (405C Maximum Ambient)

Motor Load

Class B Temp Rise 3 80°C

(Typical Design)

Class F Temp Rise 3 105°C Class H Temp Rise 3 125°C

Alarm Trip Alarm Trip Alarm Trip

3 Rated Load 130 140 155 165 175 185

Rated Load

to 1.15 S.F.

140 150 160 165 180 185

Note: S Winding RTDs are factory production installed, not from Mod−Express.

S When Class H temperatures are used, consider bearing temperatures and relubrication requirements.

Bearing RTDs − Temperature Limit In 5C (405C Maximum Ambient)

Bearing Type
Oil or Grease

Anti−Friction Sleeve

Alarm Trip Alarm Trip

Standard* 110 120 90 95

High Temperature** 100 110 70 75

Note: * Bearing temperature limits are for standard design motors operating at Class B temperature rise.

** High temperature lubricants include some special synthetic oils and greases.

4-4 Optional Accessories MN409

Bearing Thermocouple − TIC

Purpose

To measure or monitor bearing temperature during operation.

Principle of Operation

The TIC uses a junction of two dissimilar metals to generate a voltage, which varies linearly with change
in junction temperature.

Customer Interconnect

Using the same type of TIC wire, connect to terminal strip posts in separate conduit box.
Leads are tagged.

Remarks

1. Can provide continuous temperature measuring or temperature monitoring.

2. Can also measure temperature by using a potentiometer and converting voltage to temperature by
use of the proper conversion tables.

3. Needs separately mounted control and power source to read temperature or to provide a means of
relay operation for either alarm of motor shut down features.

Bearing Thermostat (Also called Bearing Temperature Relay or Gas Bulb Switch)

Purpose

To indicate the bearing temperature has exceeded normal operating temperatures.

Principle of Operation

The device operates due to expansion of gas sealed within a sealed gas bulb element which is placed in
contact with the bearing housing. As the temperature of the bearing or oil increases, the gas in the
element expands and deflects a diaphragm in the switch. The movement of the diaphragm activates the
switch contacts. The contacts can be wired directly to a relay to provide either alarm indication or motor
shutdown.

Construction

The thermostat consists of a set of normally closed or normally open contacts operated by a diaphragm
which is connected to a gas bulb through a capillary tube.

Bearing Thermometer

Purpose

To measure directly the temperature of the oil in the bearing sump or of the bearing outer race.

Optional Accessories 4-5MN409

Space Heaters

WARNING: Space Heaters operate at line voltage. Disconnect power to space heaters before performing

maintenance work on motor. Failure to observe this precaution could result in severe bodily
injury or loss of life.

Purpose

Space heaters are used to prevent condensation of moisture within the motor enclosure during shutdown
or storage periods.

Mounting

Space heaters are selected, unless otherwise order, using the following parameters.

1. Sheath temperature 350°F (200°C) nominal maximum as standard. Lower Sheath temperatures are
available.

2. Temperature rise inside of motor raised approximately 10°F (6°C) above ambient.

3. Assume ambient maximum of 40°C

From the above, space heaters are sized, mounted and terminated at an accessory conduit box.
Leads are tagged.

Approximate Space Heater Wattage for G5000/G315 is 320W, G5810/G40 is 400W, SG50 is 625W and
MG50 is 750W.

Oil Circulation System

Purpose

To provide a source of cool, clean oil to the bearings.

If a system is equipped with a variable needle valve to control flow rate, this valve MUST be adjusted.
Disconnect valve and adjust to flow rate shown on dimension sheet (available from your Baldor Sales
Office.

Description

The oil lubrication system consists of provisions for introducing oil to the bearing and drains which will
permit removal of excess oil in the sump without flooding or without letting the sump level become too
low for the oil rings to pick up oil in the event the source of oil is lost.

Oil inlet and outlets are provided with each bearing to introduce oil into the journal area. An orifice is
provided in the oil inlet pipe line to control the amount of oil introduced into the bearing. The oil outlet will
provide adequate drain without total loss of oil in the sump.

The bearing is also equipped with oil rings.

Requirement

The need for a lubrication system may exist on some ratings due to journal size and speed of the shaft.
In those cases the unit would be supplied with inlet and outlet provisions as standard for connection to a
customer provided source or oil.

The details or ratings that require a flood lubrication system are shown on the dimension sheet.

4-6 Optional Accessories MN409

Constant Level Oiler

Description

Constant level oilers are an option for the sleeve bearing motor. Constant level oilers are used as small
supplementary oil sumps which provide an additional source of oil to replenish small amounts of oil lost
by long term leakage. They provide this feature without changing the oil level in the sump.

Operation

The device is mounted on the side of the unit and is interconnected to the bearing housing. As oil in the
bearing sump is lower, the constant level device adds oil to a pre−determined level. This level is set at
the factory and should not require additional adjustments.

If the oiler is to be replaced or its operation checked, the following procedure should be followed:

1. The oil level groove on the oiler body, below the oiler bottle, must be located at the mid−point of the
oil level gauge.

2. The position of the oiler is adjusted by changing the length of the pipe nipple threaded into the
bottom of the oiler body.

Note: Fill

cap on constant level oiler must be closed tightly for oiler to operate.

Features

1. Auxiliary source of oil for slight oil leakage.

2. Provides an indication of rate of oil leakage by the change in oil level in the constant level oiler.

3. Gives a ”quick look” assurance that oil is in the bearing without the need to get close to the housing
or shaft.

Current Transformers

Description

Current transformers are a means of measuring or sensing current flow through the input leads of AC
motors.

Application

Applications involve use of current transformers either for differential protection or metering line phase
current.

Installation

The current transformers can be supplied and mounted in an oversize main motor conduit box.

The current transformers will be identified by ratio on the current transformers nameplate and will include
screw type terminals on the secondary terminals.

Selection

The selection of the current transformers is based upon the ratio that the user requires for matching his
meters or related instrumentation.

Lightning Arrestors And Surge Capacitors

Description

Lightning arrestors serve to limit the crest value of incoming voltage curves. Surge capacitors tend to
lengthen the rise time of the surge wave front reducing its effects on the stator winding.

Installation

Arrestors and/or capacitors can be mounted in an oversize main conduit box. They are connected from
line leads to ground, generally as near as possible to the motor.

Selection

Standard capacitance value for surge capacitors is 1.0 mfd − 460,575 volts, .50 mfd − 2300−7000 volts.
They are suitable for 25, 40, 50, or 60 Hz systems. Arrestors are selected according to the maximum
RMS line to ground voltage.

Appendix
API Documentation

API Documentation A−1MN409

Outline Drawing

A−2 API Documentation MN409

Anti−Friction Bearing

1. Air Deflector

2. Back End Bearing Seal / Slinger

3. Back End Bracket

4. Lock nut (Not required for all designs)

5. Lock washer (Not required for all designs)

6. Back End Bearing

7. Back End Bearing Inner Cap

8. Back End Thermal Barrier

9. Stator / Frame Assembly

10. Lifting Provisions

11. Conduit Box Assembly

12. Rotor / Shaft Assembly

13. Front End Thermal Barrier (Not required for all designs)

14. Front End Inner Cap

15. Inboard Snap Ring (Not required for all designs)

16. Front End Bearing

17. Outboard Snap Ring (Not required for all designs)

18. Front End Bracket

19. Front End Bearing Seal (Not Required For All Designs)

20. Fan

21. Fan Cover

API Documentation A−3MN409

Sleeve Bearing

1. Air Deflector

2. Shaft Slinger

3. Back End Outboard Seal (G50 only)

4. Back End Bearing Housing

5. Bearing And Oil Ring

6. Back End Inboard Bearing Seal (G50 only)

7. Bracket Cover

8. Float Adjusting Shim (G50 only)

9. Sleeve Bearing Bracket

10. Stator / Frame Assembly

11. Lifting Provisions

12. Conduit Box Assembly

13. Rotor / Shaft Assembly

14. Sleeve Bearing Bracket

15. Float Adjusting Shim (G50 only)

16. Bracket Cover

17. Front End Inboard Seal

18. Front End Bearing Housing

19. Bearing And Oil Ring

20. Front End Outboard Seal (G50 only)

21. Front End Bearing Air Seal (G50 only)

22. Fan

23. Fan Cover

A−4 API Documentation MN409

Baldor District Offices

© 2008 Baldor Electric Company
MN409

Printed in USA

6/08

BALDOR ELECTRIC COMPANY

World Headquarters

P.O. Box 2400 Fort Smith, AR 72901−2400

(479) 646−4711 Fax (479) 648−5792

www.baldor.com