Royal Enfield SPRING FRAME O.H.V. 250cc CLIPPER 1954 Workshop Maintenance Manual page 65

ROYAL ENFIELD WORKSHOP MANUAL
bearing off the spindle and insert the latter
once more in the hub at the end from which
it was removed. Now drive the spindle
through the hub the other way, when it will
bring out the remaining bearing.
6. Hub Bearings
These are deep groove single row journal
ball bearings, 5/8 in. i/d by 1.9/16 in. o/d by
7/16 in. wide. The Skefko Part No. is RLS5.
Equivalent bearings of other makes are
Hoffmann LS7, Ransome and Marles LJ5/8
in., Fischer LS7.
Section K2 Page 2
7. Fitting Limits for Bearings
The fit of the bearings in the hub barrel is
important. The bearings are locked on the
spindle between shoulders and the distance
pieces, 30538, which in turn are held up by the
nuts on the spindle. In order to prevent endways
pre-loading of the bearings it is essential that
there is a small clearance between the inner
edge of the outer race of the bearing and the
back of the recess in either end of the hub
barrel. To prevent any possibility of sideways
movement of the hub barrel on the bearings it
is, therefore, necessary for the bearings to be a
tight fit in the barrel but this fit must not be so
tight as to close down the outer race of the
bearing and thus overload the balls. The
following are the manufacturing tolerances
which control the fit of the bearings. The
figures for the bearings themselves are for SKF
bearings but other manufacturers' tolerances are
similar.
Bearing o/d 1.5622/1.5617 in.
Housing bore 1.5620/1.5616in.
Bearing bore
Shaft diameter .6252/.6248 in.
8. Refitting Ball Bearings
Note that the two ends of the spindle are not
identical. The end with the longer plain portion
between the thread and the shoulder is fitted to
the brake side of the wheel. To refit the
bearings in the hub two hollow drifts are
required, as shown in Fig. 3. One bearing is first
fitted to one end of the spindle by means of the
hollow drift; the spindle and bearing are then
entered into one end of the hub barrel which is
then supported on one of the hollow drifts. The
other bearing is then threaded over the upper
end of the spindle and driven home by means of
the second hollow drift either under a press, or
by means of a hammer, which will thus drive
both bearings into position simultaneously. In
order to make quite sure that there is clearance
between the inner faces of the outer bearing
races and the bottom of the recesses, fit the
distance washer, cover plate, dust excluder and
.6252/.6247 in.