Dynamotor Maintenance - PIAGGIO Ape Workshop Manual

Electrical system
which passes easily from one mode of operation to another, without changing the direction of rotation.
The combination of the two functions is facilitated by the fact that, structurally, dynamo and starter motor
are similar enough that the various components be confused, even constructively.
Upon start-up, the dynamotor absorbs current from the battery and operates as an electric motor; after
starting the APE engine and reaching a certain speed, the dynamotor acts as a normal dynamo, charg-
ing the battery and powering the vehicle electrical system.
To get more torque at start up, the starter motors have the excitation field in series; the dynamos, though,
require excitation field in parallel: the dynamotor is therefore equipped with both a series and a parallel
field. When the machine is at rest, the contacts of the minimum switch are open, while those of the
voltage regulator are closed and short-circuit the adjustment resistance, turning the ignition key, the
current from the battery runs the field in the series and the rotor of the dynamotor; the parallel field also
makes its contribution and the APE engine is ultimately driven at a rate sufficient to start the thermal
cycle. Once the engine is started and leaving the key in the ON position, the field in series is excluded
and the dynamotor finds itself in identical conditions with a normal dynamo with field in parallel.
MAIN CHARACTERISTICS OF THE DYNAMOTOR
Specification
Dynamotor
Rated voltage
rated power
Weight
Rotation
Connection to the engine
Control

DYNAMOTOR MAINTENANCE

As you have to remove the dynamotor before any maintenance operation, disconnect the cable con-
nected to its positive terminal (1).
During the operation copper and carbon powder is often deposited between the slats of the manifold:
so it is necessary to clean the manifold after every 200 hours of operation of the dynamotor.
For this purpose, use a clean rag soaked in petrol and blow the manifold with compressed air.
If the manifold is damaged by burns or is oval, lathe it again, bearing in mind that the reduction on the
diameter must not exceed 0.5 mm; after lathing, remove the mica to a depth of 1 mm and thoroughly
clean.
The maximum eccentricity of the manifold, on the sliding surface shall not exceed 0.03 mm.
Also check the condition of the brushes and their working conditions: for this purpose, raise, without
distorting, the wiper pressure springs and make sure that the brushes slide freely in their tracks; if they
were blocked or slide with difficulty, clean the brushes and tracks with a rag soaked in petrol.
If the brushes are worn, replace them with originals of the same type. If just one brush is worn, it is
advisable to replace the pair of brushes. After replacement, run the Dynamotor lightly loaded until the
brushes balance, i.e. until their contact surface perfectly adheres to that of the manifold.
ES - 62
Desc./Quantity
Type Bosch G 14V 11 A 39. 12V 0.9 PS. and type EFEL 12V.
0.9 PS. 11 A.
12V.
starter motor section 0.9 CV.
dynamo section 90 W.
7.6 kg.
Right.
By belt transmission.
Key switch and relays.
APE TM Benzina