Bearing installation and maintenance guide

1 And maintenance guide Bearing installation SKF Bearing installation and maintenance guide Bearing installation and maintenance guide This catalog is intended to be used as a product reference guide only and as such contains only very basic information. This catalog is not intended to be used as a design manual. The data in this How to reach SKF USA Inc. catalog is based on current information at the time of press. SKF. reserves the right to make changes necessitated by technological Customer service: 1-888-753-3477. developments. Consult SKF USA Inc. prior to design change or Technical hotline: 1-888-753-2000. order placement. Email: Any reference in this catalog to SKF Applications Engineering is making reference to the SKF USA Inc. Applications Engineering Website: Department that can be reach through the SKF Technical Hotline Online store: at 1-888-753-2000. How to reach SKF Canada Customer service: 1-866-832-6753.

2 English email: French email: Technical hotline: Website: Online store: Highlights of the new edition of the SKF Bearing installation and maintenance guide . The mounting and dismounting section has been expanded to include: - Individual step-by-step instructions for mounting self-aligning ball bearings, spherical roller bearings, and CARB . This expansion will allow the book to be used as a guide during actual mounting of bearings rather than just a reference. - Assembly, mounting and dismounting instructions for split pillow block housings, unit ball housings, and unit roller housings. The shaft and housing fit tables have been updated to include stainless steel bearings and reflect slightly different fit recommendations based on Bearing size and style. These changes are the result of SKF's profound knowledge of our products and vast experience with OEM and end user customers. The lubrication section now includes the latest viscosity requirement guidelines as well as more specific guidelines for grease relubrication.

3 The troubleshooting section is now more user-friendly. The Bearing failure section now reflects the new ISO terminology and structure for Bearing failures. It also features failure analysis service provided by SKF. Table of contents Bearing types .. 3. Bearing terminology .. 9. Mounting and dismounting of bearings .. 11. General information .. 11. Bearing care prior to mounting.. 11. Where to mount .. 11. Preparations for mounting and dismounting.. 11. Bearing handling.. 12. Fitting practice .. 12. Internal Bearing clearance.. 12. Mounting .. 13. Mounting bearings with cylindrical (straight) bore .. 13. Cold Mounting.. 13. Temperature (hot) mounting .. 14. Heating the Bearing .. 14. Heating the housing .. 14. Mounting bearings with tapered bore .. 14. Mounting tapered bore double row self-aligning ball bearings.. 15. Angular drive-up method .. 15. Mounting tapered bore spherical roller bearings .. 18. Radial clearance reduction method on adapter sleeves.

4 18. Radial clearance reduction method on solid tapered shaft .. 21. Angular drive-up method on adapter sleeves.. 22. SKF hydraulic mounting method on adapter sleeves .. 24. Mounting of CARB toroidal roller bearings .. 29. Radial clearance reduction method on adapter sleeves .. 29. Radial clearance reduction method on solid tapered shaft .. 32. Angular drive-up method on adapter sleeves.. 33. SKF hydraulic mounting method on adapter sleeves .. 35. Assembly instructions for pillow block housings, SAF and SAFS .. 38. Shaft tolerances .. 38. Seals .. 38. Grease charge .. 39. Cap bolt tightening torques .. 38. Misalignment limits .. 40. Mounting instructions for collar mounted roller unit pillow blocks and flanged housings .. 41. Mounting instructions for collar mounted tapered roller unit pillow blocks and flanged housings .. 43. Mounting and dismounting instructions for Concentra mount roller unit pillow blocks and flanged housings.

5 44. Mounting and dismounting instructions for ball unit pillow blocks and flanged housings .. 46. Mounting and dismounting instructions for Concentra ball unit pillow blocks and flanged housings .. 48. Test running .. 49. Dismounting methods .. 50. Can the Bearing be used again?.. 50. 1. Table of contents (cont.). Shaft and housing fits .. 53. Purpose of proper fits .. 53. Selection of fit .. 53. Shaft fit selection tables .. 56. Housing fit selection tables .. 58. Shaft tolerance limits for adapter mounting and pillow block seal seatings .. 59. Fits for hollow shafts .. 59. Fit tolerance tables.. 60-81. ISO tolerance grade limits .. 82. Shaft tolerances for bearings mounted on metric sleeves .. 82. Guidelines for surface roughness .. 82. Accuracy of form and position .. 83. Shaft and housing tolerance tables for inch size taper roller bearings.. 84. Shaft and housing tolerances for metric and J-prefix inch series taper roller bearings.

6 85. Shaft and housing tolerances for Precision ABEC-5 deep groove ball bearings.. 87. Lubrication .. 89. Functions of a lubricant .. 89. Selection of oil .. 90. Viscosity Equivalents Chart.. 92. Methods of oil lubrication.. 93. Grease lubrication .. 95. Grease relubrication .. 97. Relubrication intervals .. 97. Relubrication interval adjustments.. 98. Grease relubrication procedures .. 100. SKF solid oil .. 102. SKF lubrication systems (VOGEL).. 103. Troubleshooting .. 105. Common Bearing symptoms .. 106. Trouble conditions and their solutions .. 109. Bearing damages and their causes .. 119. Damage mode classification .. 120. Definitions .. 121. Loading patterns for bearings .. 122. Pre-operational damage mode causes .. 124. Operational damage mode causes .. 130. SKF failure analysis service .. 135. Additional resources .. 136. 2. Bearing types Each type of Bearing has characteristic properties which make it particularly suitable for certain applications.

7 The main factors to be considered when selecting the correct type are: Available space Precision required Magnitude and direction of load Noise factor (radial, axial, or combined) Internal clearance Speed Materials and cage design Misalignment Bearing arrangement Mounting and dismounting procedures Seals Radial bearings Deep groove ball bearings single row, with or without filling slots open basic design (1). with shields with contact seals (2). with a snap ring groove, with or without 1 2 a snap ring Angular contact ball bearings single row basic design for single mounting design for universal matching (3). single row high-precision basic design for single mounting (4). design for universal matching 3 4 matched Bearing sets double row with a one-piece inner ring (5). open basic design with shields with contact seals with a two-piece inner ring 5 6 Four-point contact ball Bearing (6). 3. Radial bearings Self-aligning ball bearings with a cylindrical or tapered bore open basic design (7).

8 With contact seals with an extended inner ring (8). 7 8. CARB toroidal roller bearings with a cylindrical or tapered bore open basic designs with a cage-guided roller set (9). with a full complement roller set with contact seals (10). 9 10. Cylindrical roller bearings single row NU type (11). N type (12). 11 12. NJ type (13). NJ type with HJ angle ring (14). NUP type (15). 13 14 15. double row, cylindrical or tapered bore NNU type (16). NN type (17). four-row with cylindrical (18) or tapered bore 16 17 18. Full complement cylindrical roller bearings single row NCF design (19). double row with integral flanges on the inner ring with integral flanges on the inner and outer rings 19 20 with contact seals (20). 4. Radial bearings Needle roller bearings drawn cup needle roller bearings open basic design (21). with contact seals needle roller bearings with flanges without an inner ring (22). 21 22 with an inner ring open basic design with contact seals Needle roller and cage assemblies single row (23).

9 Double row (24). 23 24. Spherical roller bearings with cylindrical or tapered bore open design (25). with contact seals (26). 25 26. Taper roller bearings single row (27). double row, matched sets (28). TDO (back-to-back). TDI (face-to-face). 27 28. four row (29). TQO configuration TQI configuration 29. Cross taper roller bearings (29). Slewing bearings (31). with or without gears 30 31. 5. Thrust bearings Thrust ball bearings single direction with flat housing washer (32). with sphered housing washer and seating washer 32 33 double direction with flat housing washers with sphered housing washers and seating rings (33). without seating rings Angular contact thrust ball bearings high-precision bearings single direction basic design for single mounting (34). design for universal matching matched Bearing sets 34 35 double direction standard design (35). high speed design Cylindrical roller thrust bearings single direction single row (36).

10 Double row (37). components 36 37 cylindrical roller and cage thrust assemblies shaft and housing washers Needle roller thrust bearings single direction needle roller and cage thrust assemblies (38). raceway washers thrust washers 38. Spherical roller thrust bearings single direction (39). 39. Taper roller thrust bearings single direction with or without (40) a cover screw down bearings double direction (41). 40 41. 6. Y-bearings Y-bearings (Insert bearings). with an eccentric locking collar inner ring extended on one side (42). inner ring extended on both sides with setscrews 42 43 inner ring extended on one side inner ring extended on both sides (43). with a tapered bore for adapter sleeve mounting (44). with a standard inner ring for locating by interference fit on the shaft (45). 44 45. Track runner bearings Cam rollers single row ball Bearing cam roller narrow design with crowned runner surface (46). double row ball Bearing cam roller wide design with crowned runner surface (47).