Royal Enfield 500 TWIN 1949 Workshop Maintenance Manual page 87

ROYAL ENFIELD WORKSHOP MANUAL
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 the
.6252/.6247 in.