Bearings; Grease Lubricated Bearings; Oil Lubricated Bearings - WEG W22 Premium E3 Manual De Instalación, Operación Y Mantenimiento

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3) The feet of the crates above should always be supported by suitable wood battens (Figure 5.3) and never
stand on the steel tape or without support (Figure 5.4).
X X
Figure 5.3 – Correct stacking Figure 5.4 – Incorrect stacking
4) When stacking smaller crates onto longer crates, always ensure that suitable wooden supports are provided
to withstand the weight (see Figure 5.5). This condition usually occurs with motor packaging above IEC 225S/M
(NEMA 364/5T) frame sizes.
Figure 5.5 – Use of additional battens for stacking

5.3 BEARINGS

5.3.1 Grease lubricated bearings

We recommend rotating the motor shaft at least once a month (by hand, at least five revolutions, stopping the
shaft at a different position from the original one). If the motor is fitted with shaft locking device, remove it before
rotating the shaft and install it again before performing any handling procedure. Vertical motors may be stored
in the vertical or in horizontal position. If motors with open bearings are stored longer than six months, the
bearings must be relubricated according to Item 8.2 before commissioning of the motor.
If the motor is stored for longer than 2 years, the bearings must be replaced or removed, washed, inspected
and relubricated according to Item 8.2.

5.3.2 Oil Lubricated bearings

The motor must be stored in its original operating position and with oil in the bearings. Correct oil level must be
ensured. It should be in the center of the sight glass.
During the storage period, remove the shaft locking device and rotate the shaft by hand every month, at least
five revolutions, thus achieving an even oil distribution inside the bearing and maintaining the bearing in good
operating conditions. Reinstall the shaft locking device every time the motor has to be moved.
If the motor is stored for a period of over six months, the bearings must be relubricated according to Item 8.2
before starting the operation. If the motor is stored for a period of over two years, the bearings must be
replaced or removed, washed according to manufacturer instructions, checked and relubricated according to
Item 8.2. The oil of vertical mounted motors that are transported in horizontal position is removed to prevent
oils leaks during the transport. These motors must be stored in vertical position after receiving and the bearing
must be lubricated.
Manual of Electric Motors 85