Royal Enfield 500 TWIN 1949 Workshop Maintenance Manual page 50

ROYAL ENFIELD WORKSHOP MANUAL
(ii) Wipe out the bearing housing and pack
the new bearing with H.M.P. grease.
(iii) Position the new bearing in its housing
and press it squarely home, applying pressure on
the outer journal of the bearing.
Later Types
(i) To remove the bearing slacken and
withdraw the thrust screw and pull the bearing
off the armature shaft with an extractor.
(ii) Wipe out the bearing housing and pack
the new bearing with H.M.P. grease.
(iii) Force the new bearing home against the
shoulder on the armature shaft. Insert and tighten
the thrust screw.
4 (g). Reassembly
In the main the reassembly of the dynamo is
a reversal of the operation described in
Subsection 4 (b), bearing in mind the following
points : -
(i) The field coil lead fitted with the short
length of yellow tubing must be connected,
together with the eyelet of the earthed brush, to
the commutator end bracket by means of the
screw provided.
(ii) The second field coil lead must be
connected to terminal "F" on the moulded cap.
(iii) The unearthed brush flexible lead must
be connected direct to terminal "D" on the
moulded end cap.
(iv) Take care to refit the cover band in its
original position and make sure that the securing
screw, when of flush-fitting pattern, does not
"short" on the brushgear.
(v) Take care not to damage the oil seal. If
damage is caused a new seal must be fitted.
5. Dynamo Polarity
If a dynamo has been incorrectly connected
on the motor cycle and its polarity has become
reversed, it must be re-polarised.
To do this, fit the dynamo to the motor cycle
but do not at this stage connect the cable to the
"D" and "F" terminals. Temporarily connect a
length of wire to the battery negative terminal
(the positive terminal being earthed) and hold
the other end of this wire in contact with
dynamo terminal "F" for a few seconds only.
This serves to re-polarize the dynamo. The
temporary connection can now be removed and
the original cables connected to "D" and "F"
terminals.
The practice of closing the cut-out points to
reverse the dynamo
recommended, as this method allows a high
initial surge of current from the battery to pass
through the armature, which can damage the
windings, insulation, etc. and result in a
decreased service life of the machine.
All Royal Enfield "500 Twin" and "Meteor
700" motor cycles should have the positive
terminal of the battery earthed to the frame.
polarity is not
Section G2a Page 5