Ryobi RCS4246B User manual
Important!
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General Safety Rules and Operation
Model name RCS4246B RCS4040B
Description 42cc 18" saw 40cc 16" saw
Weight - No bar, chain, fuel 4.7 kg 4.7 kg
Fuel tank capacity 340 cm3340 cm3
Lubricant tank capacity 192 cm3192 cm3
Bar length 45 cm 40 cm
Usable cutting length 42.5 cm 37.0 cm
Chain pitch 9.53 mm (0.375 inch) 9.53 mm (0.375 inch)
Chain gauge 1.27 mm (0.05 inch) 1.27 mm (0.05 inch)
Chain type 3/8” low prole full complement 3/8” low prole full complement
Drive sprocket 6 teeth x 3/8'' 6 teeth x 3/8''
Engine displacement 42 cm340 cm3
Maximum engine power(ISO 7293) 1.7 kW 1.6 kW
Minimum engine speed with
attachment 11,000 r/min 11,000 r/min
Maximum engine speed with
attachment (reference only) 12,500 r/min 12,500 r/min
Idling engine speed 2,600-3,600 r/min 2,600-3,600 r/min
Specic fuel consumption at maximum
engine power 426 g/kw.h 426 g/kw.h
Sound pressure level (ISO 22868) LpAav: 101dB(A), KpA=3 dB(A) LpAav: 101dB(A), KpA=3 dB(A)
Sound power level (ISO 22868) 112 dB(A) 112 dB(A)
Vibration (ISO 22867):
- Front Handle
- Rear Handle
Carlton / Oregon
8.2 m/s2, K=1.5
7.7 m/s2, K=1.5
Carlton / Oregon
8.2 m/s2, K=1.5
7.7 m/s2, K=1.5
Catalyst Yes Yes
Metal bumper spike Yes Yes
Primer bulb Yes Yes
Chain brake Dual post support Dual post support
Vibration isolation Springs Springs
Throttle and choke integrated control Yes Yes
Tool-less chain tensioning Yes Yes
Packaging
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See Figures 2-3, 37, 42-45.
1. Stop the engine before setting the chain tension.
2. Slightly loosen the clutch cover lock knob by pressing
in and rotating counterclockwise. (Figure 37)
3. Turn the chain tensioning dial clockwise to tension the
chain. (Figure 44)
Figure 3)
1. Lift the tip of the guide bar up to check for sag. (Figure
43)
2. Release the tip of the guide bar and turn the chain
tensioning dial clockwise. Repeat this process until
sag does not exist.
3. Hold the tip of the guide bar up and tighten the clutch
cover lock knob securely. The chain is correctly
tensioned when there is no sag on the underside of
the guide bar, the chain is snug, but it can be turned
by hand without binding. Ensure that the chain brake
is not set.
See Figures 1a - 1b.
(see figure 1)
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5. Immediately replace the fuel cap and tighten it. Wipe
up any fuel spillage.
See Figure 6.
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See Figures 7 - 8.
1. Engage the chain brake by rotating your left hand
around the front handle, allowing the back of your
hand to push the chain brake lever/hand guard toward
the bar while the chain is rotating rapidly. Be sure to
maintain both hands on the saw handles at all times.
2. Reset the chain brake back into the RUN position by
grasping the top of the chain brake lever/hand guard
and pulling toward the front handle until you hear a
click.
See Figures 8 - 13.
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See Figure 5.
1. Clean the surface around the fuel cap to prevent
contamination.
2. Loosen the fuel cap slowly.
3. Carefully pour the fuel mixture into the tank. Avoid
spillage.
4. Prior to replacing the fuel cap, clean and inspect the
sealing gasket.
1. Place the chainsaw on level ground and ensure that
no objects or obstructions are in the immediate vicinity
that could come in contact with the bar and chain.
2. Hold the front handle rmly with your left hand and put
your right foot onto the base of the rear handle. Do not
drop start the chainsaw as injury may result.
1. Turn on the ignition switch.
2. Make sure the chain brake is in the run position by
pulling back on the lever/hand guard.
3. Fully press and release the primer bulb at least 7
times.
4. Pull choke lever all the way out to START position.
5. When the temperature is above 10°C, pull the starter
grip until the engine attempts to start, but no more than
3 times. When the temperature is below 10°C, pull the
starter grip until the engine attempts to start, but no
more than 5 times.
6. Push choke lever to RUN position. Pull starter grip until
engine runs.
Note: Allow the saw to run in this position 15-30
seconds, depending upon the temperature.
7. Depress the trigger release and squeeze and release
the throttle trigger to return the engine to idle after a
total run time of at least 30 seconds.
1. Turn on the ignition switch.
2. Make sure the chain brake is in the run position by
pulling back on the lever/hand guard.
3. Pull choke lever all the way out and then return to the
run position. This will engage the fast idle.
4. Pull starter grip until engine runs, but no more than 5
times. If engine does not start after 5 pulls, use cold
engine starting procedure.
5. When the engine starts, squeeze and release the
throttle trigger to disengage the fast idle and return the
engine to its normal idle.
See Figures 7 and 14.
See Figure 15.
nIf the engine starts, runs, and accelerates, but will
not idle, turn the idle speed screw “T” clockwise to
increase idle speed.
nIf the chain turns at idle, turn the idle speed screw “T”
counterclockwise to reduce the idle RPM and stop
the chain movement. If the saw chain still moves at
idle speed, contact an authorised service centre for
adjustment and discontinue use until the repair is
made.
See Figure 16.
See Figures 17 - 18.
See Figure 19.
General Safety Rules
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See Figure 20
See Figure 21.
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See Figure 22.
nCut only wood or materials made from wood.
nNever allow children to operate the saw. Do not allow
persons to use this chainsaw who have not read this
operator’s manual or received adequate instructions
for the safe and proper use of this chainsaw.
nKeep helpers, bystanders, children, and animals, a
SAFE DISTANCE from the cutting area. During felling
operations, the safe distance should be at least twice
the height of the largest trees in the felling area. During
bucking operations, keep a minimum distance of 5
metres between workers.
nAlways cut with both feet on solid ground to prevent
being pulled off balance.
nDo not cut above chest height as a saw held higher is
difficult to control against kickback forces.
nDo not fell trees near electrical wires or buildings.
Leave this operation for professionals.
nCut only when visibility and light are adequate for you
to see clearly.
1. Take the proper stance in front of the wood with the
saw idling.
2. Accelerate the engine to full throttle just before
entering the cut by squeezing the throttle trigger.
3. Begin cutting with the saw against the log.
4. Keep the engine at full throttle the entire time you are
cutting.
5. Allow the chain to cut for you; exert only light downward
pressure. Forcing the cut could result in damage to the
bar, chain, or engine.
6. Release the throttle trigger as soon as the cut is
completed allowing the engine to idle. Running the
saw at full throttle without a cutting load can result in
unnecessary wear to the chain, bar, and engine.
7. Do not put pressure on the saw at the end of the cut as
this may cause the saw to drop in an unsafe manner.
nDo not cut down trees having extreme lean or large
trees with rotten limbs, loose bark, or hollow trunks.
Have these trees pushed or dragged down with heavy
equipment, then cut them up.
nDo not cut trees near electrical wires or buildings.
nCheck the tree for damaged or dead branches that
could fall and hit you during felling.
nPeriodically glance at the top of the tree during the
back cut to assure the tree is going to fall in the desired
direction.
nIf the tree starts to fall in the wrong direction, or if the
saw gets caught or hung up during the fall, leave the
saw and save yourself!
See Figures 23 - 26.
1. Pick your escape route (or routes in case the intended
route is blocked). Clear the immediate area around the
tree and make sure there are no obstructions in your
planned path of retreat. Clear the path of safe retreat
approximately 135° from the planned line of fall.
2. Consider the force and direction of the wind, the lean
and balance of the tree, and the location of large limbs.
These things inuence the direction in which the tree
will fall. Do not try to fell a tree along a line different
from its natural line of fall.
3. Cut a notch about 1/3 the diameter of the trunk in the
side of the tree. Make the notch cuts so they intersect
at a right angle to the line of fall. This notch should be
cleaned out to leave a straight line. To keep the weight
of the wood off the saw, always make the lower cut of
the notch before the upper cut.
4. Make the back cut level and horizontal, and at a
minimum of 2 in. above the horizontal cut of the notch.
Note: Never cut through to the notch. Always leave
a band of wood between the notch and back cut
(approximately 2 in. or 1/10 the diameter of the tree).
This is called a “hinge” or “hinge wood.” It controls
the fall of the tree and prevents slipping or twisting or
shooting back of the tree off the stump.
5. On large diameter trees, stop the back cut before it is
deep enough for the tree to either fall or settle back on
the stump. Then insert soft wooden or plastic wedges
into the cut so they do not touch the chain. Drive
wedges in, little by little, to help jack the tree over.
6. As the tree starts to fall, stop the chainsaw and put
it down immediately. Retreat along the cleared path,
but watch the action in case something falls your way.
See Figure 27.
See Figure 28.
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See Figure 29.
See Figure 30.
See Figure 31.
See Figure 32.
See Figures 33 - 34.
nWork slowly, keeping both hands on the saw with a
firm grip. Maintain secure footing and balance.
nKeep the tree between you and the chain while limbing.
nDo not cut from a ladder. This is extremely dangerous.
Leave this operation for professionals.
nDo not cut above chest height. A saw held higher than
chest height is difficult to control against kickback.
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See Figure 35.
See Figures 36 - 45.
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1. Press in on the clutch cover lock knob and rotate
counterclockwise until the clutch cover can be
removed.
2. Remove the bar and chain from the mounting surface.
3. Remove the old chain from the bar.
4. Lay out the new saw chain in a loop and straighten any
kinks. The cutters should face in the direction of chain
rotation. If they face backwards, turn the loop over.
5. Place the chain drive links into the bar groove as
shown.
6. Position the chain so there is a loop at the back of
the bar.
7. Hold the chain in position on the bar and place the loop
around the sprocket.
8. Fit the bar ush against the mounting surface so that
the bar studs are in the long slot of the bar.
9. Replace the clutch cover ensuring that the adjusting
pin in the clutch cover is in the bar chain tensioning
pin hole.
10. Replace the clutch cover and rotate clutch cover lock
knob just enough to hold the cover in position.
This manual suits for next models
1
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