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VAL
V[
30
Fuel
System
Tractors,
Lawn
and
Garden
-
110
and
112
10-6
Carburetor
- 112
Tractor
SM-2059-(Apr-67)
112
TRACTOR
GENERAL
INFORMATION
FL
Ofl T
V
F\
L V E
SU.,T
LOAT
M
6074
Fig.
TO-Cutaway
View
of
IValbro Carburetor
Fuel
enters
the
bowl
through
a
valv
e
control-
led
by
the
float,
Figure
10.
Air
entering
the
car-
buretor
is
controlled
by
the
choke
valv
e
when
starting.
Th
e
air-fuel
mixture
entering
the
en-
gine
is
regulated
by
the
throttle
valv
e
which
maintains
uniform
engine
speed
under
varying
loads,
as
controlled
by
th
e
governor.
Whenever
the
throttle
is
opened
quickly
to
give
extra
power
for
a
sudden
load,
an
extra
amount
of
fuel
is
required
for
a
momentarily
richer
air-
fuel
mixture.
The
secondary
idle
discharge
pro-
vides
the
extra
fuel.
The
carburetor
has
two
adjusting
needles
;
one
for
high
speeds
and
one
for
low
speeds,
and
an
idle
adjusting
sc
rew
.
The
high
speed
mixture
needle
controls
the
amount
of
fuel
entering
the
venturi
at
high
en-
gine
sp
e
eds.
The
idle
mixture
needle
controls
the
amount
of
fuel
entering
the
venturi
when
engine
is
idling
or
when
throttle
valve
is
in
the
full
closed
posi-
tion.
Litho
in
U. S. A.
REPAIR
When
diagnosis
indi
ca
tes
the
carburetor
should
be
cleaned.
disassemble
the
carburetor
before
placing
it
in
the
cleaning
soltuion
to
mak
e
sure
the
solution
reaches
all
surfac
es
and
parts.
Always
install
all
the
parts
in
the
repair
kit
when
the
carburetor
needs
servicin
g.
Always
install
new
gaskets
whenever
the
carburetor
is
disassembled
even
though
no
oth
er
new
parts
ar
e
installed.
DISASSEMBLING
CARBURETOR
Remove
carburetor
from
engine
a
nd
r e
move
air
cleaner
base
and
elbow.
Remove
high
speed
and
idl
e
mixtur
e n
ee
dles.
Remove
idle
adjusting
scr
ew.
Remove
fuel
bowl
retainin
g
nut
, fuel
bo
wl
,
fuel
bowl
gasket,
float
assembly
,
ne
e
dle
valv
e,
spring
and
needle
seat.
Remove
screws
holding
throttle
valve
and
remove
valve
and
throttle
shaft
with
r e
turn
spring
from
carburetor
housing.
Remove
choke
valve
and
choke
shaft.
REMOVING
MAIN
NOZZLE
\ 1 ''''I "
Fig.
TT-Main
Nozzle
Normally
the
main
nozzle.
Figure
11,
should
not
be
removed.
Remove
the
main
nozzle
onl
y
if
the
high
speed
needl
e
seat
is
damag
ed
or
because
of
excessive
dirt.