Figure 22: Grease lubricated bearings
3.
Fill both grease cavities through fittings with recommended grease until fresh grease comes out
of the relief holes (408C).
4.
Ensure frame seals (332A, 333B) are seated in bearing housing and, if not, press in place with
drains located at the bottom.
5.
Run mixer for about 2 hours or until grease stops emitting from housing and replace two (2) relief
plugs (408C).
NOTICE:
The bearing temperature usually rises after regreasing due to an excess supply of grease.
Temperatures will return to normal after mixer has run and purged the excess from the bear-
ings, usually two to four hours.
For most operating conditions a lithium based mineral oil grease of NLGI consistency No. 2 is recom-
mended. This grease is acceptable for fluid temperatures of -15°C to 110°C (5°F to 230°F). Bearing tem-
peratures are generally about 25°C (45°F) higher than bearing housing outer surface temperature.
Acceptable Greases:
Mobil Mobilux EP2
Exxon Unirex N2
Texaco Multifak 2
Shell Alvania 2 EP Grease 2
Sunoco Multipurpose EP
SKF LGMT 2
CAUTION:
Never mix greases of different consistency (NLGI 1 or 3 with NLGI 2) or different thickener
soaps (sodium or calcium with lithium). The consistency usually becomes softer and will not
provide adequate lubrication to the bearings.
For operating temperatures above 110°C (230°F) the bearings should be lubricated with a high tempera-
ture grease. Mineral oil greases should have oxidation stabilizers and a consistency of NLGI 3.
5.3 Maintenance of bearings
32
3501 Installation, Operation, and Maintenance Instructions
