Specification Sheet

ManualsBrandsBaldor-Reliance ManualsGeneral Purpose Electric MotorsGeneral Purpose Motor, 208-230/460 V, 0.25 HP, 1725 RPM, 3 PH, 56C, TENV

Maintenance & Troubleshooting 3−3MN408

Table 3-5 Bearings Sizes and Types

Frame Size

NEMA (IEC)

Bearing Description

(These are the “Large” bearings (Shaft End) in each frame size)

Bearing

Weight of Grease to

add *

oz (Grams)

Volume of grease

to be added

teaspoon

56 to 140 (90) 6203 0.08 (2.4) 0.15 0.5

140 (90) 6205 0.15 (3.9) 0.2 0.8

180 (100−112) 6206 0.19 (5.0) 0.3 1.0

210 (132) 6307 0.30 (8.4) 0.6 2.0

250 (160) 6309 0.47 (12.5) 0.7 2.5

280 (180) 6311 0.61 (17) 1.2 3.9

320 (200) 6312 0.76 (20.1) 1.2 4.0

360 (225) 6313 0.81 (23) 1.5 5.2

400 (250) 6316 1.25 (33) 2.0 6.6

440 (280) 6318 1.52(40) 2.5 8.2

440 (280) 6319 2.12 (60) 4.1 13.4

5000 to 5800 (315−355) 6328 4.70 (130) 9.2 30.0

5000 to 5800 (315−355) NU328 4.70 (130) 9.2 30.0

360 to 449 (225−280) NU319 2.12 (60) 4.1 13.4

AC Induction Servo

76 Frame 180 (112) 6207 0.22 (6.1) 0.44 1.4

77 Frame 210 (132) 6210 0.32 (9.0) 0.64 2.1

80 Frame 250(160) 6213 0.49 (14.0) 0.99 3.3

* Weight in grams = .005 DB of grease to be added

Note: Not all bearing sizes are listed.

For intermediate bearing sizes, use the grease volume for the next larger size bearing.

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.

Relubrication Procedure Be sure that the grease you are adding to the motor is compatible with the grease already

in the motor. Consult your Baldor distributor or an authorized service center if a grease other than the

recommended type is to be used.

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

With Grease Outlet Plug

1. With the motor stopped, clean all grease fittings with a clean cloth.

2. Remove grease outlet plug.

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

and bearing failure.

3. Add the recommended amount of grease.

4. Operate the motor for 15 minutes with grease plug removed.

This allows excess grease to purge.

5. Re-install grease outlet plug.

Without Grease Provisions

Note: Only a Baldor authorized and UL or CSA certified service center can disassemble a UL/CSA

listed explosion proof motor to maintain it’s UL/CSA listing.

1. Disassemble the motor.

2. Add recommended amount of grease to bearing and bearing cavity. (Bearing should be about 1/3

full of grease and outboard bearing cavity should be about 1/2 full of grease.)

3. Assemble the motor.