Poulan HDF550E User Manual - Page 16

Remove, Guard, Adjust, Carburetor

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SERVICE AND ADJUSTMENTS TO REMOVE BELT GUARD (See Fig. 22) • Remove two (2) cap nuts and washers from side of belt guard. • Loosen (do not remove) tine shield nut on underside of tine shield. • Pull belt guard out and away from unit. • Replace belt guard by reversing above procedure. Be sure slot in bottom of belt guard is under head of tine shield bolt and all nuts are tightened securely. CAP NUTS AND WASHERS o BELT GUARD • • TINE SHIELD NUT FIG. 22 ENGINE TO ADJUST CARBURETOR (See Fig. 23) The carburetor has a high speed fixed jet and has been preset at the factory and adjustment should not be necessary. However, minor adjustments may be required to compensate for differences in fuel, temperature, altitude or load. If the carburetor does need adjustment, proceed as follows. In general, turning the idle needle valve in (clockwise) decreases the supply of fuel to the engine giving a leaner fuel/air mixture. Turning the needle valve out (counterclockwise) increases the supply of fuel to the engine giving a richer fuel/air mixture. IMPORTANT: DAMAGE TO THE NEEDLES AND THE SEATS IN CARBURETOR MAY RESULT IF SCREWS ARE TURNED IN TOO TIGHT. PRELIMINARY SETTING • Air cleaner assembly must be assembled to the carbu- retor when making carburetor adjustments. • With engine off, turn idle needle valve in (clockwise) closing it finger tight and then turn valve out (counterclockwise) 1-1/2 turns. FINAL SETTING • Start engine and allow to warm for five minutes. Make final adjustments with engine running at idle and tine control lever in "OFF" position. • With throttle control in "SLOW" position, turn idle needle valve in (clockwise) until engine begins to die, then turn out (counterclockwise) until engine runs rough. Turn valve to a point midway between those two positions. IDLE RPM ADJUSTMENT • To adjust idle RPM, rotate throttle linkage counterclockwise and hold against stop while adjusting idle speed adjusting screw to obtain 1750 RPM. Release throttle linkage. ACCELERATION TEST • Move throU4:1 control lever from "SLOW" to "FAST" position. If engine hesitates or dies, turn idle needle valve out (counterclockwise) 1/8 turn. Repeat test and continue to adjust, if necessary, until engine accelerates smoothly. High speed stop is factory adjusted. Do not adjust or damage may result. IMPORTANT: NEVER TAMPER WITH THE ENGINE GOVERNOR. WHICH IS FACTORY SET FOR PROPER ENGINE SPEED. OVERSPEEDING THE ENGINE ABOVE THE FACTORY HIGH SPEED SETTING CAN BE DANGEROUS. IF YOU THINK THE ENGINE-GOVERNED HIGH SPEED NEEDS ADJUSTING, CONTACT YOUR NEAREST AUTHORIZED SERVICE CENTER/ DEPARTMENT, WHICH HAS THE PROPER EQUIPMENT AND EXPERIENCE TO MAKE ANY NECESSARY ADJUSTMENTS. THROTTLE LINKAGE THROTTLE STOP CO IDLE SPEED ADJUSTING SCREW IDLE NEEDLE VALVE FIG. 23 16

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SERVICE
AND
ADJUSTMENTS
TO
REMOVE
BELT
GUARD
(See
Fig.
22)
•
Remove
two
(2)
cap
nuts
and
washers
from
side
of
belt
guard.
•
Loosen
(do
not
remove)
tine
shield
nut
on
underside
of
tine
shield.
•
Pull
belt
guard
out
and
away
from
unit.
•
Replace
belt
guard
by
reversing
above
procedure.
Be
sure
slot
in
bottom
of
belt
guard
is
under
head
of
tine
shield
bolt
and
all
nuts
are
tightened
securely.
o
•
•
TINE
SHIELD
NUT
CAP
NUTS
AND
WASHERS
BELT
GUARD
FIG.
22
ENGINE
TO
ADJUST
CARBURETOR
(See
Fig.
23)
The
carburetor
has
a
high
speed
fixed
jet
and
has
been
preset
at
the
factory
and
adjustment
should
not
be
neces-
sary.
However,
minor
adjustments
may
be
required
to
compensate
for
differences
in
fuel,
temperature,
altitude
or
load.
If
the
carburetor
does
need
adjustment,
proceed
as
follows.
In
general,
turning
the
idle
needle
valve
in
(clockwise)
decreases
the
supply
of
fuel
to
the
engine
giving
a
leaner
fuel/air
mixture.
Turning
the
needle
valve
out
(counter-
clockwise)
increases
the
supply
of
fuel
to
the
engine
giving
a
richer
fuel/air
mixture.
IMPORTANT:
DAMAGE
TO
THE
NEEDLES
AND
THE
SEATS
IN
CARBURETOR
MAY
RESULT
IF
SCREWS
ARE
TURNED
IN
TOO
TIGHT.
PRELIMINARY
SETTING
•
Air
cleaner
assembly
must
be
assembled
to
the
carbu-
retor
when
making
carburetor
adjustments.
•
With
engine
off,
turn
idle
needle
valve
in
(clockwise)
closing
it
finger
tight
and
then
turn
valve
out
(counter-
clockwise)
1-1/2
turns.
FINAL
SETTING
•
Start
engine
and
allow
to
warm
for
five
minutes.
Make
final
adjustments
with
engine
running
at
idle
and
tine
control
lever
in
"OFF"
position.
•
With
throttle
control
in
"SLOW"
position,
turn
idle
needle
valve
in
(clockwise)
until
engine
begins
to
die,
then
turn
out
(counterclockwise)
until
engine
runs
rough.
Turn
valve
to
a
point
midway
between
those
two
positions.
IDLE
RPM
ADJUSTMENT
•
To
adjust
idle
RPM,
rotate
throttle
linkage
counterclock-
wise
and
hold
against
stop
while
adjusting
idle
speed
adjusting
screw
to
obtain
1750
RPM.
Release
throttle
linkage.
ACCELERATION
TEST
•
Move
throU4:1
control
lever
from
"SLOW"
to
"FAST"
position.
If
engine
hesitates
or
dies,
turn
idle
needle
valve
out
(counterclockwise)
1/8
turn.
Repeat
test
and
continue
to
adjust,
if
necessary,
until
engine
acceler-
ates
smoothly.
High
speed
stop
is
factory
adjusted.
Do
not
adjust
or
damage
may
result.
IMPORTANT:
NEVER
TAMPER
WITH
THE
ENGINE
GOVERNOR.
WHICH
IS
FACTORY
SET
FOR
PROPER
ENGINE
SPEED.
OVERSPEEDING
THE
ENGINE
ABOVE
THE
FACTORY
HIGH
SPEED
SETTING
CAN
BE
DANGEROUS.
IF
YOU
THINK
THE
ENGINE
-GOVERNED
HIGH
SPEED
NEEDS
ADJUSTING,
CONTACT
YOUR
NEAREST
AUTHORIZED
SERVICE
CENTER/
DEPARTMENT,
WHICH
HAS
THE
PROPER
EQUIPMENT
AND
EXPERIENCE
TO
MAKE
ANY
NECESSARY
ADJUSTMENTS.
THROTTLE
LINKAGE
THROTTLE
STOP
CO
IDLE
SPEED
ADJUSTING
SCREW
IDLE
NEEDLE
VALVE
FIG.
23
16