Engine System - Petrol 90Service Manual – SW4000
Engine System - Petrol
Functional Description
The engine system generates electric current for all
machine functions.
The assembly consists of an internal combustion en-
gine and dynamotor, which are both connected to the
main crankshaft.
The engine is a single-cylinder air-cooled petrol type.
The engine start-up is made by the dynamotor to
which it is connected.
The dynamotor acts as a starter, using the battery
only for the time necessary to start the engine.
At a later stage, the running engine supplies the
power to the dynamotor to generate the current and
to power the electrical systems of the machine. The
surplus current is used to charge the batteries.
The engine speed is xed, 2,750 rpm, to grant a con-
stant current to the electrical system.
The fuel tank is fastened outside the engine, in the
rear side of the machine. The tank has a fuel level in-
dicator with oat, and a valve with integrated lter.
The choke lever on the engine has been extended in
order to be easily activated from the driver’s seat po-
sition.
The fuel reserve warning light turns on when the fuel
in the tank is less than 2.2 liters.
The engine is equipped with an oil level sensor (Oil
Alert), which purpose is to avoid damages caused by
an insufcient oil quantity in the oil pan. Before the
oil level goes below the safety limit, the system (Oil
Alert) automatically stops the engine shorting the
spark plug to the chassis..
If the engine stops and do not restart, check the en-
gine oil level before doing any other troubleshooting
procedure.
Wiring Diagram
FUSE (F4)
IGNITION
KEY (SW1)
EMERGENCY
PUSH-BUTTON (SW0)
MACHINE ON
RELAY (K4)
FRAME (FR)
OIL
ALERT
ENGINE START
ELECTROMAGNETIC
SWITCH (ES2)
ENGINE
SPARK PLUG (SPK)
ENGINE
P200128
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