Motor Without Grease Fitting; Motor With Grease Fitting; Compatibility Of The Mobil Polyrex Em Grease With Other Greases - WEG W22 Premium E3 Manual De Instalación, Operación Y Mantenimiento

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Table 8.4 - Lubrication intervals for cylindrical roller bearings – HGF line
Frame
IEC NEMA
315L/A/B and 5006/7/8 and
315C/D/E 5009/10/11
355L/A/B and 5807/8/9 and
355C/D/E 5810/11/12
400L/A/B and 6806/7/8 and
400C/D/E 6809/10/11
450 7006/10
500 8006/10
560 8806/10
630 9606/10
For each increment of 15 ºC above the room temperature, the relubrication intervals given in the Table must be
halved. The relubrication interval of motors designed by the manufacturer for mounting in horizontal position,
but installed in vertical position (with WEG authorization), must be halved.
For special applications, such as: high and low temperatures, aggressive environments, driven by frequency
inverter (VFD – frequency inverter), etc., please contact WEG about the required amount of grease and the
relubrication intervals.

8.2.1.1. Motor without grease fitting

Motors without grease fittings must be lubricated in accordance with the existing Maintenance Plan. Motor
disassembly must be carried out as specified in Item 8.3. If motors are fitted with shielded bearings (for
example, ZZ, DDU, 2RS, VV), these bearings must be replaced at the end of the grease service life.

8.2.1.2. Motor with grease fitting

To lubricate the bearings with the motor stopped, proceed as follows:
Motors with grease fittings must be stopped to be lubricated. Proceed as follows:
Before lubricating, clean the grease nipple and immediate vicinity thoroughly;
g
Lift grease inlet protection;
g
Remove the grease outlet plug;
g
Pump in approximately half of the total grease indicated on the motor nameplate and run the motor for about
g
1 (one) minute at rated speed;
Switch-off the motor and pump in the remaining grease;
g
Lower again the grease inlet protection and reinstall the grease outlet protection.
g
To grease the motor while running, proceed as follows:
Before lubricating, clean the grease nipple and immediate vicinity thoroughly;
g
Pump the total grease indicated on the motor nameplate;
g
Lower again the grease inlet protection.
g
For lubrication, use only manual grease gun.
If Motors are provided with a spring device for grease removal, the grease excess must be removed by pulling
the rod and cleaning the spring until the spring does not remove more grease.

8.2.1.3. Compatibility of the Mobil Polyrex EM grease with other greases

The Mobil Polyrex EM grease has a polyurea thickener and a mineral oil thus being compatible with greases
that contain:
Lithium based thickener, lithium-based complex thickener, polyurea thickener and refined mineral oil;
g
The used grease must have in its formulation corrosion and oxidation inhibitors.
g
In general terms, greases with the same type of soap are compatible to each other. However, depending on the
proportion of the mixture there may be incompatibility. In such a case, it is not recommended to mix different
types of greases without contacting the supplier or WEG beforehand.
114 Manual of Electric Motors
Bearing
Poles
designation
4
NU320
6 - 8
4
NU322
6 - 8
4
NU324
6 - 8
4
6 NU328
8
4
6 NU330
8
4
NU228 + 6228
6 - 8
4
6 NU232 + 6232
8
Lubrication intervals (hours)
Amount of
grease (g)
50 Hz
4300
50
4500
3500
60
4500
2900
72
4500
2000
93 4500
4500
1700
104 4100
4500
75 2600
106 4500
92 1800
120 4300
140 4500
60 Hz
2900
4500
2200
4500
1800
4500
1400
3200
4500
1000
2900
4500
1600
4500
1000
3100
4500