Re-Lubrication Guidelines

General guidelines and information for the re-lubrication of TECO-Westinghouse stock motors equipped with standard greasable rolling bearings.

Grease Type: Mobil Polyrex EM (unless otherwise specified).

Intervals: Lubrication intervals are dependent on temperature, environment, rotational speed and load conditions; therefore it is difficult to be precise about replenishment intervals. However, for common applications the periods shown in Table 1 may be used as a guide. For smaller bearings not listed in Table 1 use the maximum interval shown for rated speed.

Grease Quantity: The amount of grease to add per replenishment is dependent on the size of the bearing. The following table (Table 2) will provide two different quantities; “G” will provide the quantity required to re-lubricate the bearing sufficiently for the interval time found in Table 1; while the second quantity “Full Qty” is the amount required to completely fill the bearing with new grease forcing the old grease out the exit tube. Adding the “Full Qty” amount is time consuming and requires ideal conditions; old dried up grease can potentially block the exit tube leading to over greased bearings and other undesirable results. For general applications the “G” quantity is sufficient, less time consuming and has lower risk of over greased bearings. The “G” amount is based on the formula G=DxBx0.005 and is widely used in our industry.

Table 2:

d = Bore (mm)
D = OD (mm)
B = Width (mm)
G = Grease Quantity (g)

G=D*B*.005

Procedure:

• Clean grease zerk and grease gun tip
• Remove exit tube plug to allow old grease to drain
• Add grease slowly with motor running, adding amount determined in Table 2
• Allow one hour for old grease to run out, then reinstall exit tube plug

*make sure grease gun is calibrated (one pump of gun should be approximately one gram of grease)

Data Sheet: Polyrex EM Data Sheet