CARBURETOR
A
Pilot
Air
Jet
No.1
Ignition Switch
l~e....p..-----r-
-
.
--
I
Solenoid
Primary Main
Jet
Description
The low-speed system provides air-fuel mixture for
smooth
low-speed engine operation for light-load
performance [A].
Fuel from the float chamber is sent through the main jet
and
fuel passage to the pilot jet where the fuel is metered.
At the same time, air
is
fed through the venturi air orifice
and
pilot air jet
No.2
to the pilot air jet No.1 where the air
is
metered then, air is mixed with the fuel.
The flow of air-fuel mixture is adjusted by the
by-pass
screw and enters the air horn through the by-pass hole
and pilot outlet. It mixes with a small amount of air that
goes past the
closed or slightly open throttle valve. The
final mixture flows into the cylinders.
The mixture adjusting screw
is
provided for adjusting
air-fuel mixture necessary for idle.
The by-pass screw is for adjusting the flow of fuel to the
by-pass
hole which provides mixture for engine operation
from
off
idle to a medium load operation.
The
fuel shutoff solenoid,
in
the low-speed system,
functions as
follows: When the key switch is
ON
it opens
the
valve to open the fuel line. When the key switch is OFF
it closes the fuel feed line and prevents spontaneous
running of the engine.
Added Sept.
90
Mixture Adjusting
Screw
-70-7-
Pilot
Outlet
Throttle
Valve
13-{)9714
741,
742,
743, 7430S Bobcat Loader
Service Manual
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