ARIA

GENERAL 8 BEARINGS BALL AND ROLLER BEARINGS ! CAUTION Never refit a ball or roller bearing without first ensur- ing that it is in good condition. 1. Remove all traces of lubricant from bearing un- der inspection by washing in a suitable degreaser; maintain absolute cleanliness throughout operations. 2. Inspect visually for markings of any form on roll- ing elements, raceways, outer surface of outer rings or inner surface of inner rings. Reject any bearings found to be marked, since any marking in these areas indicates onset of wear. 3. Holding inner race between finger and thumb of one hand, spin outer race and check that it re- volves absolutely smoothly. Repeat, holding outer race and spinning inner race. 4. Rotate outer ring gently with a reciprocating mo- tion, while holding inner ring; feel for any check or obstruction to rotation, and reject bearing if action is not perfectly smooth. 5. Lubricate bearing generously with lubricant ap- propriate to installation. 6. Inspect shaft and bearing housing for discolora- tion or other marking suggesting that movement has taken place between bearing and seating. (This is particularly to be expected if related markings were found in point 2). 7. Ensure that shaft and housing are clean and free from burrs before fitting bearing. 8. If one bearing assembly of a pair shows an im- perfection it is generally advisable to replace both with new bearings; an exception could be made if the faulty bearing had covered a low mileage, and it could be established that dam- age was confined to it only. 9. When fitting bearing to shaft, apply force only to inner ring of bearing, and only to outer ring when fitting into housing, as shown above. 10. In the case of grease lubricated bearings ( e.g. hub bearings) fill space between bearing and outer seal with recommended grade of grease before fitting seal. 11 . Always mark components of separable bearings (e.g. taper roller bearings) in dismantling, to en- sure correct reassembly. Never fit new rollers in a used outer ring, always fit a complete new bear- ing assembly.