Chain Maintenance - Ryobi RCS4246B Operator's Manual

11. Remove all slack from the chain by rotating the chain
tensioning dial clockwise until the chain seats snugly
against the bar with the drive links in the bar groove.
12. Lift the tip of the guide bar up to check for sag.
13. Release the tip of the guide bar and turn the chain
tensioning dial clockwise. Repeat this process until
sag does not exist.
14. 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.
Note: If chain is too tight, it will not rotate. loosen
the clutch cover lock knob by pressing in and slightly
rotating counterclockwise, then rotate the chain
tensioning dial counterclockwise. lift the tip of the
guide bar up and retighten the clutch cover lock knob
securely. ensure that the chain will rotate without
binding.

CHAIN MAINTENANCE

See Figures 45 - 47.
WARNING
Check that the switch is in the STOP "0" position
before you work on the saw.
use only a low-kickback chain on this saw. this fast-
cutting chain provides kickback reduction when properly
maintained.
For smooth and fast cutting, maintain the chain properly.
the chain requires sharpening when the wood chips are
small and powdery, the chain must be forced through the
wood during cutting, or the chain cuts to one side. During
maintenance of the chain, consider the following:
n Improper filing angle of the side plate can increase
the risk of severe kickback.
n raker (depth gauge) clearance.
- too low increases the potential for kickback.
- not low enough decreases cutting ability.
n If the cutter teeth hit hard objects such as nails and
stones, or are abraded by mud or sand on the wood,
have an authorised service centre sharpen the chain.
Note: Inspect the drive sprocket for wear or damage
when replacing the chain. If signs of wear or damage are
present in the areas indicated, have the drive sprocket
replaced by an authorised service centre.
Note: If you do not fully understand the correct
procedure for sharpening the chain after reading the
instructions that follow, have the saw chain sharpened
by an authorised service centre or replaced with a
recommended low-kickback chain.
English
SHARPENING THE CUTTERS
See Figures 48 - 51.
Be careful to file all cutters to the specified angles and
to the same length, as fast cutting can only be obtained
when all cutters are uniform.
WARNING
the saw chain is very sharp. always wear
protective gloves when performing maintenance
to the chain to prevent serious personal injury.
1. Tension the chain prior to sharpening. Refer to
Adjusting The Chain Tension.
2. Use a 5/32 in. (4 mm) diameter round file and holder.
Do all of your filing at the midpoint of the bar.
3. Keep the file level with the top plate of the tooth. Do
not let the file dip or rock.
4. Use light but firm pressure. Stroke towards the front
corner of the tooth.
5. Lift the file away from the chain tooth on each return
stroke.
6. Put a few firm strokes on every tooth. File all left hand
cutters in one direction. Then move to the other side
and file the right hand cutters in the opposite direction.
7. Remove filings from the file with a wire brush.
CAUTION
a dull or improperly sharpened chain can cause
excessive engine speed during cutting, which may result
in severe engine damage.
WARNING
Improper chain sharpening increases the
potential of kickback.
WARNING
Failure to replace or repair a damaged chain can
cause serious injury.
TOP PLATE FILE ANGLE
See Figure 52.
n COrreCt 30° – file holders are marked with guide
marks to align file properly to produce correct top
plate angle.
n less tHan 30° – for cross cutting.
n mOre tHan 30° – feathered edge dulls quickly.
SIDE PLATE FILE ANGLE
See Figure 53.
n COrreCt 80° – produced automatically if you use
the correct diameter file in the file holder.
n HOOK – "Grabs" and dulls quickly; increases the
potential of KICKBaCK. resulted from using a file
with a diameter too small or a file held too low.
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