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mainten
ance
air cleaner
FIG. 12
Clean air cleaner element (C), every 25 hours
-
-
more often
under
dusty conditions.
1.
Remove wing nut (A).
2. Remove cover (B).
3. Remove element
(C),
and top
element (top
or
bottom) on flat surface or wash
in
r.:m·sudsin~!J
detergent and
flush
from ins ide
until
water is
clear. After
washing,
air
dry
thoroughly before
using. DO
NOT
OIL.
4.
Reassemble ports as shown.
Be
sure element
seats on grommet
(D).
Screw
wing nut
(A), down
tight.
.
starter
a1r screen
~
-
\.,
~,,
~
...
·'
<:0' 1
The s
t
a rter screen guard (A), and the starter
ro·
tot ing screen
(I ocaterl direct
I
y behind
the starter
sc reen
guard),
are
designed
to keep grass,
chaff
and leaves from
entering
the
cool ing system.
They
must
be cleaned period
icall
y.
The c leaning
of
the screens
will vary with the conditions in wh ich
the Tractor
is
used.
They
should not
be allowed
to
become dirty. This
wou ld
interfere
with
the cooling
of
the
engine. Remove the screen
guard (A),
clean
it
and the s tarter
rotating screen
regu
lar ly.
clean
cooling
system
~~'-r7:::::-'-T---'::==-
CL
E AN OUT
FIG.
14
CHAFF
AND
DIRT
Gra
ss
or
chaff
may clog cooling
system
after
pro·
longed serv ice in cutting tall dry grasses or hay.
Conti
nued
operation with a clogged cooling
system
cau
ses
severe
overheating
and
possible
engin~
damage.
Remove blower housing and clean
regularly.
3738R-l8 .12
.72
• 8 •
carbu
retor
FIG. 15
Minor carburetor adjustment may
be
required to com·
pensate for
d ifferences
in fuel, temperat
ure,
altitude
and load
.
TO
ADJUST
CARBURETOR:
Turn
needle valve
clockwise until it
just
closes. CAUTION
: Va lve
may
be damaged by turning it in too for.
Now open needle valve 1-1
/
8 turns
counterclockwise.
Close
idle
valve
in some manner
and
open
1-1/8
turns. This initial adjustment will
permit the
engine
to be started and warmed up prior to final
adjustment.
FINAL ADJUSTMENT:
Turr
needle
valve
inuntil
engine misses (lean mixture),
then
turn
it out past
smooth operating
point
until engine
runs unevenly
(rich mixture). Now turn needle
valve to the mid-
point between rich and lean
so
t
he
engine runs
smoothly. Hold throttle at
idle
position
and set idle
speed adjusting screw
until fast
idle is
obtained
(1750
RPM).
Hold throttle in
jdl
e position and
turn
idl,e,
valve
it~Jiean}\;ond
out (rich)
until
engine
idles
smoofh'ly.
Then reset
idte speed adjusting
screw
so
that engine idles
at
1750 RPM. Release throttle-
engine
should
accelerate
without
hesitation
or
sputtering.
If
engine
does
not accelerate properly,
the carburetor
should be
re-adjusted to
a
slightly
richer
mixture.
spark
pI
ug
FIG.
16
Clean
and
reset gop at .030"
every
100
hours
of
operation.
Blast cleaning
of
spark
plugs in
mach
ines
that
use
ab rasi ve
grit
is not recommended
.
Spark
plugs should
be cleaned by
scraping
or
wi re
brushing and washing
with
a
commercial
solve
nt or
go
s
o
l in
e.
Should spark
plug need replacing,
use
Champion CJ-8.
ignition
point gap
T
he ig
n
ition
point
setti
ng
is
.020".
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