Adjusting The Carburettor - Ryobi PCN 4040 Owner's Operation Manual

OPERATION
WORK AREA PRECAUTIONS (Fig. 21)
Cut only wood or materials made from wood; no
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sheet metal, no plastics, no masonry, no non-wood
building materials.
Never allow children to operate your saw. Allow no
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person to use this chainsaw who has not read this
operator's manual or received adequate instructions
for the safe and proper use of this chainsaw.
Keep everyone – helpers, bystanders, children, and
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animals, a SAFE DISTANCE from the cutting area.
During felling operations, the safe distance should be
a least twice the height of the largest trees in the
felling area. During bucking operations, keep a
minimum distance of (4.5 m) 15 ft. between workers.
Always cut with both feet on solid ground to prevent
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being pulled off balance.
Do not cut above chest height as a saw held higher
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isdifficult to control against kick-back forces.
Do not fell trees near electrical wires or buildings.
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Leave thisoperation for professionals.
Cut only when visibility and light are adequate for you
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to see clearly.
ADJUSTING THE CARBURETTOR (Fig. 22,
23 & 24)
Before adjusting the carburettor, clean the air filter (A)
and the starter cover vents (B). Allow the engine to warm
up prior to carburettor adjustment. Refer to "Maintenance"
later in this manual.
The carburettor is factory set and should not require
adjusting. The carburettor will permit only limited
adjustment of the "L" (Low Jet) and "H" (High Jet)
needles. Any adjustment should be done by a Ryobi
service dealer.
Under no circumstances should the "L" (Low Jet)
and "H" (High Jet) needles be forced outside the range
of adjustment.
CAUTION
Serious damage may occur to the engine if
improper adjustments are made to the "L" and "H"
needles. Do not force the "L" and "H" needles
outside the adjustment range!
ADJUSTING IDLING SPEED (Fig. 24)
If the engine starts, runs, and accelerates but will not
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idle, turn the idling speed screw "T" clockwise to
increase idling speed.
English
If the chain turns at idle, turn the idling speed screw "T"
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anticlockwise to reduce the idle RPM and stop the
chain movement. If the saw chain still moves at idling
speed, contact a Ryobi service dealer for adjustment
and discontinue use until the repair is made.
WARNING
THE SAW CHAIN SHOULD NEVER TURN
AT IDLE. Turn the idling speed screw "T"
anticlockwise to reduce the idle RPM and stop
the chain, or contact a Ryobi service dealer for
adjustment and discontinue use until the repair is
made. Serious personal injury may result from the
saw chain turning at idle.
OPERATING THE CHAIN BRAKE (Fig. 25 & 26)
Refer to "Safety" earlier in this manual for additional
information. Check the operating condition of the chain
brake prior to each use.
1. Start the engine and grasp the front and rear handles
securely with both hands.
2. Pull the throttle trigger to bring the chainsaw up to full
speed. Using the back of your left hand, engage the
chain brake (A) by pushing the chain brake lever/hand
guard toward the bar while the chain is rotating rapidly.
NOTE: The chain brake should engage and stop the
chain immediately. If not, stop the saw by placing the
ignition switch in the "O" stop position. Take the saw to
a Ryobi service dealer for repair and discontinue use
until the repair is made.
3. Reset the chain brake back into the RUN position (B)
by grasping the right-hand side (from operator's
position) of the chain brake lever/hand guard and pull
towards the front handle until you hear a click.
FELLING TREES – HAZARDOUS CONDITIONS
(Fig. 27)
WARNING
Do not fell trees during periods of high wind or
heavy precipitation. Wait until the hazardous
weather has ended.
When felling a tree, it is important that you heed the
following warnings to prevent possible serious injury.
Wear eye, hearing, and head protection (A) when
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operating this equipment.
Do not cut down trees having an extreme lean or large
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trees with rotten or dead limbs, loose bark, or hollow
trunks. Have these trees pushed or dragged down
with heavy equipment, then cut them up.
Consider the distribution and weight of heavy limbs (B).
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Clear out the undergrowth around the tree to be
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felled (C).
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