ARIA

GENERAL

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.

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.

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.