Poulan 177580 - Manual (Page 23)

23
SERVICE AND ADJUSTMENTS
HOOD
TO REMOVE HOOD AND GRILL ASSEMBLY
(See Fig. 30)
• Raise hood.
• Unsnap headlight wire connector.
• Stand in front of tractor. Grasp hood at sides, tilt toward
engine and lift off of tractor.
• To replace, reverse above procedure.
FIG. 30
HEADLIGHT WIRE
CONNECTOR
CABLE
CLAMP
SCREW
SPEED CONTROL
BRACKET
IDLE FUEL
ADJUSTING
NEEDLE
IDLE SPEED
ADJUSTING
SCREW
THROTTLE LEVER
FIG. 31
FIG. 32
ENGINE
Maintenance, repair, or replacement of the emission control
devices and systems, which are being done at the custom-
ers expense, may be performed by any non-road engine
repair establishment or individual. Warranty repairs must be
performed by an authorized engine manufacturer's service
outlet.
TO ADJUST THROTTLE CONTROL CABLE
(See Fig. 31)
The throttle control has been preset at the factory and
adjustment should not be necessary. Check adjustment as
described below before loosening cable. If adjustment is
necessary, proceed as follows:
•
With engine not running, move throttle control lever from
slow to choke position. Slowly move lever from choke to
fast position.
• Check to see if hole in throttle lever and hole in speed
control bracket are aligned.
• If holes are not aligned, loosen cable clamp screw and
align the holes by inserting a pencil or a 1/4" drill bit
through both holes.
• Pull throttle cable up to remove slack and tighten cable
clamp screw. Remove alignment pencil or drill bit.
TO ADJUST CARBURETOR (See Fig. 32)
The carburetor has been preset at the factory and adjust-
ment should not be necessary. However, minor adjustment
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 adjusting needles in (clockwise)
decreases the supply of fuel to the engine giving a leaner
fuel/air mixture. Turning the adjusting needles 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 NEEDLE IS
TURNED IN TOO TIGHT.
NOTE: The carburetor on this engine is low emission. It is
equipped with an idle fuel adjusting needle with a limiter cap,
which allows some adjustment within the limits allowed by
the cap. Do not attempt to remove the limiter cap. The limiter
cap cannot be removed without breaking the adjusting
needle.
•
Be sure you have a clean air filter and the throttle control
cable is adjusted properly (see above).
• Start engine and allow to warm for five minutes. Make
adjustments with engine running and shift/motion control
lever in neutral (N) position.
• Idle speed setting - With throttle control lever in slow
position, engine should idle at 1750 RPM. If engine idles
too slow or fast, turn idle speed adjusting screw in or out
until correct idle is attained.
• Idle fuel needle setting - With throttle control lever in slow
position, turn idle fuel adjustment needle in (clockwise)
until engine begins to die and then turn out (counter-
clockwise) until engine runs rough. Turn needle to a point
midway between those two positions.
• Recheck idle speed. Readjust if necessary.
ACCELERATION TEST -
•
Move throttle control lever from slow to fast position. If
engine hesitates or dies, turn idle fuel adjusting needle
out (counterclockwise) 1/8 turn. Repeat test and con-
tinue to adjust, if necessary, until engine accelerates
smoothly.
High speed stop is factory adjusted. Do not adjust - damage
may result.
IMPORTANT: NEVER TAMPER WITH THE ENGINE
GOVERNOR, WHICH IS FACTORY SET FOR PROPER
ENGINE SPEED. OVERSPEEDING THE ENGINE ABOVE
T H E F A C T O R Y H I G H S P E E D S E T T I N G C A N B E
DANGEROUS. IF YOU THINK THE ENGINE-GOVERNED
HIGH SPEED NEEDS ADJUSTING, CONTACT YOUR
N E A R E S T A U T H O R I Z E D S E R V I C E C E N T E R /
DEPARTMENT, WHICH HAS PROPER EQUIPMENT AND
E X P E R I E N C E T O M A K E A N Y N E C E S S A R Y
ADJUSTMENTS.