TM 5-3895-374-24-1 Lubrication Notes GENERAL 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 below. Roller Bearings: Use NLGI(2) grade 0, 1.  2 or non-channeling shown below grease as shown below. Grease classification TYPE OF GREASE & RELUBE CYCLE RECOMMENDED 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 and/or moisture use cycle of 1 week. Vertical applications normally require 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 Engineering 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 Applications Engineering 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 bearing housing. I 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 mm2/s. 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 (page 3-591)