1
DYNAMO LIGHTING AND MAGNETO IGNITION
I
t
1
DYNAMO
Output Control.
The dynamo works in conjunction with a regulator unit to
give compensated voltage control.
Although combined structurally, the regulator
and cut-out are electrically separate.
Both are accurately adjusted during manu-
facture and should not be
tzmpered with.
The regulator provides
a
completely automatic control.
It
ca9es the dynamo to
give an output which varie's according to the load on the battery and
its
state ofcharge.
When the battery is discharged, the dynamo gives a high output, but if the battery
is
fully charged then the dynamo gives only a trickle charge so as to keep the battery
in good condition. In addition to controlling the output of the dynamo according
to the condition of the battery, the regulator provides for an increase of output to
balance the current taken by the lamps when in use.
The cut-out
is
an automatic switch which connects the dynamo to the battery only
when the dynamo voltage exceeds tlie battery voltage, or conversely, which dis-
connects to prevent the battery discharging through the dynamo windings.
The dynamo output is accurately set to suit the requirements of the motorcycle and
in normal service the battery
will be kept in a good condition. If due to special
running conditions
it
is
found that the battery
is
not kept in a charged condition or
is
being overcharged, the regulator should be re-set by
a
Lucas Service Depot or
Agent. Accurate measuring equipment
is
required to set the regulator correctly.
Ammeter Readings.
Normally, during day
timcrunning when the battery is in
good condition, the dynamo gives only a trickle charge so that the ammeter needle
mould show only a small deflection to the
"
j"
side of the scale.
1
A discharge reading should be observed immediately after switching on the head-
lamp. This usually happens after
a
long run when the battery voltage is high. After
a
short time the battery voltage will drop and the regulator will respond, causing
I
the dynamo output to balance the lamp load.
Lubrication.
No lubrication is
required to these models as ball bearings are fitted
at both ends.
These bearings are packed with grease,during assembly and will
last until the machine
is
taken down for a general overhaul.
Inspection of Brushgear and Commutator.
Every six months, remove the
commutator cover and inspect the brurhgear and commutator. The brushes, which
are held in boxes by means of springs, must make firm contact with the commutator.
Move each brush to see that
it
is
fre; to slide in
its
holder; if
it
sticks, remove
it
and
clean with a cloth moistened with petrol. Care must be taken to replace the brushes
in their original position, otherwise they will not "bed" properly on the commutator.
if after long service the brushes have become worn to such an extent that they will
not bear properly on the commutator they must be replaced. Always use genuine
Lucar; brushes, which should be fitted by a Service Agent so that they can be properly
bedded to the commutator.
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