Royal Enfield 500 TWIN 1949 Workshop Maintenance Manual page 83

ROYAL ENFIELD WORKSHOP MANUAL
posts in the brake shoes thus allowing the whole
assembly to fall apart.
4. Replacing Brake Linings
Brake linings are supplied either in pairs
ready drilled complete with rivets (Part No.
37786BX) or ready fitted to service replacement
brake shoes (Part No. 38042). When riveting
linings to shoes secure the two centre rivets first
so as to ensure that the lining lies flat against the
shoe. Standard linings are Ferodo MR41, which
are drilled to receive cheese headed rivets.
5. Removal of Hub Spindle and Bearings
To remove the hub spindle and bearings
Section K1 Page 2
having already removed the brake cover plate
assemblies, lift out the felt washers, Part No.
21466, and distance pieces, Part No. 30538.
Now hit one end of the wheel spindle with a
copper hammer or mallet, thus driving it out of
the hub bringing one bearing with it and leaving
the other in position in the hub. Drive the
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 Manes LJ5/8 in., Fischer LS7.
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
cover plate nuts 31347. 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
Housing bore
Bearing bore
Shaft diameter
8. Refitting Ball Bearings
To refit the bearings in the hub, two hollow
drifts are required, this is shown in Fig. 3. One
1.5622/1.5617 in.
1.5620/1.5616 in.
.6252/.6247 in.
.6252/.6248 in.