Ryobi RY10521B Manuel D'utilisation page 28

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:
 Improper filing angle of the side plate can
increase the risk of severe kickback.
 Raker (depth gauge) clearance.
• Too low increases the potential for kickback.
• 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 an authorized service center
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 indi-
cated, have the drive sprocket replaced by an
authorized service center.
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 authorized service center or
replace with a recommended low-kickback chain.
SHARPENING THE CUTTERS
See Figures 49 - 52.
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 pro-
tective gloves when performing maintenance
to the chain to prevent serious personal injury.
 Tension the chain prior to sharpening. Refer to
Adjusting The Chain Tension.
 Use a 3/16 in. diameter round file and holder.
Do all of your filing at the midpoint of the bar.
 Keep the file level with the top plate of the tooth.
Do not let the file dip or rock.
 Using light but firm pressure. Stroke towards
the front corner of the tooth.
MAINTENANCE
TOP PLATE
RIVET HOLE
Page 28 — English
INSPECT
DRIVE
SPROCKET
CUTTING
CORNER
SIDE PLATE
DEPTH GAUGE
HEEL
TOE
GULLET
Fig. 48
Fig. 49
Fig. 50
Fig. 51