Motor Lubrication; Motor Lubrication Schedule (For Motors With Grease Fittings) - Grundfos CR-H Serie Instrucciones De Instalación Y Funcionamiento

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.
In the case of seasonal operation (motor is idle for more than
six months of the year), it is recommended to grease the motor
when the pump is taken out of operation.

11.2 Motor lubrication

Electric motors are pre-lubricated from factory and do not require
additional lubrication before start-up.
Motors without external grease fittings have sealed bearings that
cannot be relubricated.
Motors with grease fittings should only be lubricated with
approved types of grease (see table below). Do not overgrease
the bearings. Overgreasing will cause increased bearing heat and
may 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 following:
• The type of grease.
• The size of the bearings.
• The speed at which the bearings operate.
• 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 and certain pump ranges may have higher
thrust loads. Pumps with high thrust loads should be greased
according to the next service interval level.
+104 °F
Standard
(+40 °C) little corrosion
+122 °F Moderate dirt,
Severe
(+50 °C)
> +122 °F
Severe dirt,
(+50 °C)
Extreme abrasive dust,
or class H
insulation
Clean, Grundfos motors
are greased for life
or will have the
grease type on the
corrosion
nameplate.
Baldor motors are
greased with
Polyrex EM (Exxon
corrosion
Mobile).
11.3 Motor lubrication schedule (for motors with
grease fittings)
New motors that have been stored for a year or more should be
regreased.
Service interval
NEMA/(IEC)
Standard Severe Extreme Weight Volume
Frame size
hrs hrs
Up through
5500 2750
210 (132)
Over 210
through 280 3600 1800
(180)
Over 280 up
through 360 2200 1100
(225)
Over 360
2200 1100
(225)
* The grease outlet plug must be removed before adding new
grease.
Procedure
To avoid damage to motor bearings, grease must
be kept free of dirt. For an extremely dirty
environment, contact Grundfos, the motor
Caution
manufacturer or an authorized service center for
additional information. Mixing dissimilar grease
is not recommended.
1. Clean all grease fittings. If the motor does not have grease
fittings, the bearings are 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 taking approximately one minute until new
grease appears at the shaft hole in the end plate 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.
Grease to add
3
hrs OZ./g In /tsp
550 0.3/8.4 0.6/2
0.61/
360 1.2/3.9*
17.4*
0.81/
220 1.5/5.2*
23.1*
2.12/ 4.1/
220
60.0* 13.4*
15