AJS 350 1954, Руководство по эксплуатации и инструкция по использованию, Страница: 80 / 96

CHARGING
A LUCAS type E3-N dynamo is fitted. It is anti-clockwise in rotation. The
cutting in speed is 1250—1500 r.p.m. at 7 volts and at 1,850 to 2,200 revolutions per
minute it gives an output of 5 amps at 7 volts. The replacement part number is 20028A.
The negative brush is insulated and the positive brush is earthed. The two exterior
terminals are marked " D " and " F," indicating the respective terminals for the Positive
and Field wires that lead to similarly marked terminals on the Regulator Unit,
Inspect commutator and brush gear every 5,000 to 6,000 miles,
(Maker's
Recommendation.)
Remove the cover band to inspect commutator and brush gear.
The brushes are held in contact with the commutator by means of springs. Move each
brush, see they are free to slide in their holders, if dirty, or if sticking, remove and clean
with a doth moistened with petrol. Take care to replace brushes in their original
positions, otherwise they will not " bed " properly on the commutator.
If, after long service, the brushes have became worn to such an extent that the brush
flexible wire is exposed on the running face, or if the brushes do not make good contact
with the commutator, they must be replaced by genuine LUCAS brushes.
The commutator must be free from any trace of oil or dirt and should have a highly
polished appearance. Clean a dirty, or blackened, commutator by pressing a fine dry
cloth against it while the engine is slowly turned over by means of the kick-starter.
(It is an advantage to remove the sparking plug before doing this).
If the commutator
is very dirty, moisten the cloth with petrol.
At every 10,000 miles, the complete dynamo should be handed to a Lucas Service Station
for dismantling, replacement of worn parts, cleaning and lubrication.
Electrical breakdown of the dynamo is most unusual and therefore before assuming this
unit is defective, it should be tested as follows :
Check that the dynamo, regulator and battery are correctly connected.
To remove the dynamo (see page 79)
Test Dynamo in position by :
(a) Remove the two wires from the dynamo terminals and connect the two terminals
with a short length of wire.
(b) Start the engine and set to run at normal idling speed.
(c) Connect the negative lead of a moving coil voltmeter (calibrated not less than 0 to
10 volts) to either of the two dynamo terminals and connect the positive lead to a
good earth point on the dynamo or engine.
(d) Gradually increase the engine speed, when the voltmeter reading should rapidly rise
and without fluctuation.
Do not allow the voltmeter reading to rise above 10 volts.
Do not race the engine in an attempt to increase the voltage. It is sufficient to run
up the engine to a speed of 1,000 r.p.m.
If the above reading is obtained the dynamo is in order.
If there is no reading, check the brush gear.
If there is a low reading of approximately ½ volt, the field winding may be at fault.
If there is a low reading of approximately 1½ to 2 volts, the armature winding may
be at fault.
If the tests, mentioned above, clearly indicate the dynamo is not charging, it is then
desirable to remove the dynamo from the machine in Order to make further tests and
repairs or replacements.
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