Section K7A - Royal Enfield METEOR MINOR STANDARD 1958 Workshop Maintenance Manual

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 LJ 5/8 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
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 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, 1.5620/1.5616 in.
Bearing bore, .6252/.6247 in.
Shaft diameter, .6252/.6248 in.
8. Refitting Ball Bearings
To refit the bearings in the hub, two hollow
drifts are required, as shown in Fig. 2. 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
Section K7a Page 2
there is clearance between the inner faces of the
outer bearing race, and the bottom of the
recesses, fit the distance washers, cover plate,
dust excluder and the nut, on the spindle.
Tightening the nuts should not have any effect
on the ease with which the spindle can be
turned. If tightening the nuts makes the spindle
hard to turn this may be taken as proof that the
bearings are bottoming in the recesses in the
hub barrel before they are solid against the
shoulders on the spindle. In this case, the
bearing should be removed and a thin packing
shim fitted between the inner race and the
shoulder on the spindle.
9. Reassembly of Brake Shoes and Operating
Cam into the Cover Plate
No difficulty should be experienced in
carrying out these operations. Put a smear of
grease on the pivot pin and on the operating
face of the cam: also on to the cylindrical
bearing surface of the operating cam. Fit the
operating lever, 38905 on its splines in a
position to suit the extent of wear on the linings
and secure with the nut and washer. Note that
the position of the operating lever may have to
be corrected when adjusting the brake after
refitting the wheel. The range adjustment can
be extended by moving this lever on to a
different spline. Limit of wear is reached when
the cam is turned through nearly 90° with the
brake hard on, so that there is a danger that the
operating springs, cannot return the brake to
the off position.
10. Final Assembly of Hub before Replacing
Wheel
Before replacing the felt washers which
form the grease seals, pack all bearings with
grease. Recommended greases are Castrolease
(Heavy) Mobilgrease (No. 4), Esso Grease,
Energrease C3 or Shell Retinax A. These are
all medium heavy, lime soap or aluminium
soap greases. The use of H.M.P. greases which
have a soda soap base is not recommended, as
these tend to be slighty corrosive if any damp
finds its way into the hubs.
Make sure that the inside of the brake drum
is quite free from oil or grease, damp, etc.
Replace the felt washers, distance collars, dust
excluder and brake cover plate and securely
tighten the spindle nuts.
11. Wheel Rim