Motor Inspection; Motor Lubrication Schedule - Grundfos CR Series Installation And Operation Manual

Motor Inspection

Inspect the motor at regular intervals, approximately every 500 hours of operation or every three months, whichever occurs first. Keep the motor clean
and the ventilation openings clear. The following steps should be performed at each inspection:
WARNING:
DO NOT TOUCH ELECTRICAL CONNECTIONS BEFORE YOU FIRST ENSURE THAT POWER HAS BEEN DISCONNECTED. ELECTRICAL SHOCK CAN
CAUSE SERIOUS OR FATAL INJURY. ONLY QUALIFED PERSONNEL SHOULD ATTEMPT INSTALLATION, OPERATION, AND MAINTENANCE OF THIS
EQUIPMENT.
1. Check that the motor is clean. Check that the interior and exterior of the motor is free of dirt, oil, grease, water, etc. Oily vapor, paper, pulp,
textile lint, etc. can accumulate and block motor ventilation. If the motor is not properly ventilated, overheating can occur and cause early
motor failure.
2. Use an Ohmmeter ("Megger") periodically to ensure that the integrity of the winding insulation has been maintained. Record the
Ohmmeter readings. Immediately investigate any significant drop in insulation resistance.
3. Check all electrical connectors to be sure that they are tight.
Motor Lubrication
Electric motors are pre-lubricated at the factory and do not require additional lubrication at start-up. Motors without external grease fittings have
sealed bearings that cannot be re-lubricated. Motors with grease fittings should only be lubricated with approved types of grease. Do not over-
grease the bearings. Over greasing will cause increased bearing heat and can result in bearing/motor failure. Do not mix petroleum grease and
silicon grease in motor bearings.
Bearing grease will lose its lubricating ability over time, not suddenly. The lubricating ability of a grease (over time) depends primarily on the type of
grease, the size of the bearings, the speed at which the bearings operate and the severity of the operating conditions. Good results can be obtained
if the following recommendations are used in your maintenance program. It should also be noted that pumps with more stages, pumps running to
the left of the performance curve, certain pump ranges may have higher thrust loads. Pumps with high thrust loads should be greased according to
the next service interval level.
Severity
of Service
Standard
Severe
Extreme
If pump is fitted with a bearing flange that requires grease, see the stickers on either the bearing flange or coupling guards for proper grease type
and greasing schedule.

Motor Lubrication Schedule

Up through 210 (132)
Over 210 through 280 (180)
Over 280 up through 360 (225)
Over 360 (225)
*The grease outlet plug M M U U S S T T be removed before adding new grease.
Procedure
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.
1. Clean all grease fittings. If the motor does not have grease fittings, the bearing is sealed and cannot be greased externally.
2. If the motor is equipped with a grease outlet plug, remove it. This will allow the old grease to be displaced by the new grease.
3. If the motor is stopped, add the recommended amount of grease. If the motor is to be greased while running, a slightly greater
quantity of grease will have to be added.
NOTE: If new grease does not appear at the shaft hole or grease outlet plug, the outlet passage may be blocked. At the next service
interval the bearings must be repacked.
Add grease SLOWLY until new grease appears at the shaft hole in the endplate or grease outlet plug. Never add more than
1-1/2 times the amount of grease shown in the lubrication schedule.
4. For motors equipped with a grease outlet plug, let the motor run for 20 minutes before replacing the plug.
Ambient
Temperature
(Maximum)
+104°F (+40°C)
+122°F (+50°C)
>+122°F (+50°C)
or Class H insulation
Standard
NEMA/(IEC) Service
Frame Size Interval
5500 hrs.
3600 hrs.
2200 hrs.
2200 hrs.
Environment
Clean, little corrosion
See motor nameplate for
Moderate dirt, corrosion
grease type or compatible
Severe dirt, abrasive equivalent type of grease
dust, corrosion
Severe Extreme Weight of
Service Service Grease to Add
Interval Interval Oz./(Grams)
2750 hrs. 550 hrs. 0.30 (8.4)
1800 hrs. 360 hrs. 0.61 (17.4)*
1100 hrs. 220 hrs. 0.81 (23.1)*
1100 hrs. 220 hrs. 2.12 (60.0)*
Approved Types
of Grease
Volume of
Grease to Add
In 3 /(Teaspoons) )
0.6 (2)
1.2 (3.9)*
1.5 (5.2)*
4.1 (13.4)*
9