Royal Enfield 500 TWIN 1949 Workshop Maintenance Manual page 49

ROYAL ENFIELD WORKSHOP MANUAL
(ii) Draw the pole shoe and field coil out of
the yoke and lift off the coil.
(iii) Fit the new field coil over the pole shoe
and place it in position inside the yoke. Take
care to ensure that the taping of the field coil is
not trapped between the pole shoe and the yoke.
(iv) Locate the pole shoe and field coil by
lightly tightening the fixing screw, insert the pole
shoe expander (see Fig. 5), open to its fullest
extent and tighten the screw. Remove the
expander and give the screw a final tightening
with the wheel-operated screwdriver. Lock the
screw in position by caulking, that is, by tapping
some of the metal of the yoke into the slot in the
head of the screw.
4 (e). Armature
The testing of the armature winding requires
the use of a voltdrop test or a growler. If these
are not available, the armature should be
checked by substitution. No attempt should be
made to machine the armature core or to true a
distorted armature shaft.
4 (f). Bearings
Ball bearings are fitted to both the
commutator and drive end brackets. When the
bearings become worn to such an extent that
they allow side movement of the armature shaft,
they must be replaced (see Figs. 6 and 7). The
bearings should not be disturbed except for the
purpose of replacement. To replace the ball
bearing at the drive end proceed as follows :-
(i) Remove the bearing retaining plate from
the drive end bracket by unscrewing the three
countersunk screws.
Section G2a Page 4
(ii) Press the defective bearing out of the end
bracket. Wipe out the bearing housing and pack
the new bearing with H.M.P. grease.
(iii) Position the bearing in its housing and
press it squarely home, applying pressure on the
outer journal of the bearing.
To replace the ball bearing at the commutator
end, proceed as follows:
Earlier Type
(i) Using an expanding caliper-type extractor,
draw the bearing from its housing in the
commutator end bracket.