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the bar nuts securely. Ensure that the chain will rotate
without binding.
ADJUSTING THE CHAIN TENSION
See figure 48 - 50.
WARNING
Never touch or adjust the chain while the motor is
running. The saw chain is very sharp. Always wear
protective gloves when performing maintenance on the
chain.
1. Stop the engine before setting the chain tension.
2. Make sure the guide bar mounting nuts are loosened
to finger tight and turn the chain tensioning screw (M)
clockwise to tension the chain.
NOTE: A cold chain is correctly tensioned when there
is no slack on the underside of the guide bar, the chain
is snug, and it can be turned by hand without binding.
3. Re-tension the chain whenever the flats on the drive
links hang out of the bar groove.
NOTE: During normal saw operation, the temperature
of the chain increases. The drive links of a correctly
tensioned warm chain will hang approximately
1.25 mm (0.05 inch) out of the bar groove. To help
determine the correct warm chain tension, the tip of
the combination wrench (C) can be used as a guide.
NOTE: New chain tends to stretch. Check the chain
tension frequently and tension as required.
CAUTION
A chain tensioned while warm may be too tight upon
cooling. Check the "Adjusting the chain tension" before
next use.
CHAIN MAINTENANCE
See figure 51 - 52.
WARNING
Check that the switch is in the STOP "O" position before
you work on the saw.
Use only a low-kick-back chain on this saw. This
fastcutting chain provides kick-back 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
English (Original Instructions)
wood during cutting, or the chain cuts to one side. During
maintenance of the chain, consider the following:
1. Improper filing angle of the side plate can increase the
2. Raker (depth gauge) clearance (A).
SHARPENING THE CUTTERS
See figure 53 - 56.
Parts of a cutter
(A) Cutting corner
(B) Side plate
(C) Depth gauge
(D) Toe
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.
1. Wear gloves for protection.
2. Tension the chain prior to sharpening.
3. Use a 4 mm (5/32 inch) diameter round file and holder.
4. Keep the file level with the top plate of the tooth. Do
5. Using light but firm pressure, stroke towards the front
6. Lift the file away from the steel on each return stroke.
7. Put a few firm strokes on every tooth. File all left-hand
8. Remove filings from the file with a wire brush.
A dull or improperly sharpened chain can cause
excessive engine speed during cutting which may result
in severe engine damage.
31
risk of a severe kick-back.
–
Too low increases the potential for kick-back.
–
Not low enough decreases cutting ability.
If the cutter teeth hit hard objects such as nails and
stones, or are abraded by mud or sand on the wood,
have the Ryobi service dealer sharpen the chain.
NOTE: Inspect the drive sprocket for wear or damage
when replacing the chain (B). If signs of wear or
damage are present in the areas indicated, have the
drive sprocket replaced by a Ryobi service dealer.
(E) Gullet
(F) Heel
(G) Rivet hole
(H) Top plate
NOTE: Refer to "Maintenance – adjusting the chain
tension" earlier in this manual.
Do all your filing at the midpoint of the bar.
not let the file dip or rock.
corner of the tooth.
cutters (A) in one direction. Then move to the other
side and file the right-hand cutters (B) in the opposite
direction.
CAUTION
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