The upper half of the housing usually has two tapped holes 300 from
the vertical line One hole Is in the center or the housing. The other Is to
the side. Lubricate through the center hole for spherical roller bearings
with W33 feature (with grooves and 3 holes around the outer ring) and
lubricate through the side holes for self-aligning ball bearings and
spherical roller bearings without W33 feature (without groove and 3
holes around the outer ring ) THIS IS IMPORTANT THE
LUBRICANT WILL NOT GET TO THE BEARING IF IT IS
APPLIED THROUGH THE CENTER HOLE WHEN A BEARING
WITHOUT THE GROOVED OUTER RING IS USED
GREASE LUBRICATION. If grease is used as a lubricant It should
be smeared between the rolling elements and worked in. The lower
hall of the housing should be packed 1/3 to 112 full.
Ball Bearings: Use NLGI(2) grade 2 or 3 channeling grease as shown
Roller Bearings: Use NLGI(2) grade 0, 1. 2 or non-channeling shown
below grease as shown below.
TYPE OF GREASE & RELUBE CYCLE
1 Calcium Complex Greases Not Recommended
2 National Lubricating Grease Institute Consistency Code
3 Definition of speed categories:
Low Up to ¼ catalog speed rating for static oil lubrication
Medium ¼ to ½ catalog speed rating for static oil lubrication
High ½ to lull catalog speed rating for static oil lubrication
4 Consult SKF Applications Engineering it temperature is below
-18C (0F) or above 82C (180°F).
5. Extremely slow speed, will require special consideration it loads are
high. For moderate conditions of dirt and /or moisture use cycle
of 1 to 2 months.
6 Clean-Dry application only. For extreme conditions Or dirt
moisture use cycle of 1 week. Vertical applications normally
shorter than normal relube cycles
7 Use class "C" where toad s heavy, 15, 000 hours rating tie or
less and/or speeds are less than 100 rpm.
'Under all conditions. application should be checked using
the Life Adjustment Factor for Lubrication found in the SKF
OIL LUBRICATION: if oil is used as a lubricant and the bearing
operating conditions are not known, is a good rule to select an oil that
will have at least the following viscosities at the operating temperature.
Ball Bearings: 13 Centistokes (70 Saybolt Sec)
Spherical Roller Bearings: 20 Centistokes (100 Saybolt Sec). It
should be kept In mind that the above recommendations are general
and if bearings are required to operate over a wide range of
temperatures and under various combinations of speeds and loads, a
reputable lubricant manufacturer should be consulted
Static Oil Lubrication: When oil lubrication is used, pillow blocks can
be furnished with fittings to control the proper oil level. Additional oil
should be added as required.
Static Oil Lubrication
1 Use only highest quality mineral oil
2 Use oil with minimum viscosity of 20 cSt (100 SUS) at the
bearing operating temperature.**
3 The static oil level to be at the center of the lower most rolling
element (DO NOT OVER FILL.)
4 Static oil operating temperature should not exceed 820C
(180F) If temperature exceeds 820C (1800F) consult SKF
5 Complete lubricant change should be made annually - more
frequent If contamination or heat is severe.
**Under all conditions application should be checked using the
Life Adjustment Factor for Lubrication found In the SKF
Engineering Data or A Guide to Better Bearing Lubrication.
Circulating Oil If circulating oil is used as a lubricant and a W33
bearing is used. (with groove and 3 holes around outer ring) entry can
be made through the center hole In the cap. The exit of lubricant
should be made from both sides of the lower half of the block, to
prevent possible flooding, or too much lubricant accumulating In the
CAUTION: Do not over lubricate bearings as too much lubricant will
result in higher than normal temperature.
For further assistance consult SKF Applications Engineering
Reference to Cenbstokes In this publication Is equivalent to the use of
8 Consult SKF Applications Engineering-Grease lube not normally
recommended under this combination of operating conditions.
9 Never mix greases with unlike bases
10 Remove old grease at least once a year