Ryobi P548 Operator's Manual page 29

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 a
Ryobi Service dealer.
HOW TO SHARPEN THE CUTTERS
See Figures 37 - 39.
NOTE: If you do not fully understand the correct
procedure for sharpening the chain after read-
ing the instructions that follow, have the saw
chain sharpened by a Ryobi Service dealer or
replace with a recommended low-kickback chain.
Be careful to file all cutters to the specified angles
and to the same length, as fast cutting can be
obtained only 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.
 Properly tension the chain prior to sharpening.
Refer to Adjusting the chain tension section
earlier in this manual. Do all of your filing at the
mid-point of the bar.
 Use a 5/32 in. diameter round file and holder.
 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.
 Lift file away from the steel on each return stroke.
 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. Occasionally remove filings
from the file with a wire brush.
WARNING:
Improper chain sharpening increases the poten-
tial of kickback, which can result in serious
personal injury.
WARNING:
Failure to replace or repair damaged chain can
cause serious injury.
MAINTENANCE
RIVET HOLE
29 - English
INSPECT DRIVE
SPROCKET
CUTTING CORNER
TOP PLATE
HEEL
GULLET
LEFT HAND
CUTTERS
RIGHT HAND
CUTTERS
Fig. 36
SIDE PLATE
DEPTH GAUGE
TOE
Fig. 37
Fig. 38
Fig. 39