Scotts LPS41024S Manuel De L'opérateur page 9

HOW TO SHARPEN THE CUTTERS
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.
Wear gloves for protection. Properly tension the chain prior to
sharpening. Refer to "Chain Tension Section" earlier in this manual.
Do all of your filing at the midpoint 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 filing from the file with
a wire brush.
WARNING: Improper chain sharpening increases the potential of
kickback.
WARNING: Failure to replace or repair damaged chain can cause
serious injury.
WARNING: The saw chain is very sharp, always wear protective
gloves when performing maintenance to the chain.
CHAIN TENSION AND MAINTENANCE
TOP PLATE FILING ANGLE
Correct 30 degrees – File holders are marked with guide marks to align
file properly to produce top plate angle.
Less than 30 degrees – for cross cutting.
More than 30 degrees – feathered edge dulls quickly.
SIDE PLATE ANGLE
Correct – 80 degrees produced automatically if correct diameter file is
used in file holder.
Hook – "Grabs" and dulls quickly. Increases potential of kickback. Re-
sults from using a file with a diameter too small, or file held to low.
Backward Slope – Needs too much feed pressure, causes excessive
wear to bar and chain. Results from using a file with a diameter too
large, or file held too high.
DEPTH GAUGE CLEARANCE
The depth gauge should be maintained at a clearance of .025 in. (0.6
mm). Use a depth gauge tool for checking the depth gauge clearances.
Every time the chain is filed, check the depth gauge clearance
Use a flat file and a depth gauge jointer to lower all gauges uniformly.
Depth gauge jointers are available in .020 in. to .035 in. (0.5 mm to 0.9
mm). Use a .025 in. (0.6 mm) depth gauge jointer. After lowering each
depth gauge, restore original shape by rounding the front. Be careful not to
damage adjoining drive links with the edge of the file.
Depth gauges must be adjusted with the flat file in the same direction the
adjoining cutter was filed with the round file. Use care not to contact cutter
face with flat file when adjusting depth gauges.
9