Ryobi RCS5145N User Manual page 15

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
cutters (A) in one direction. Then move to the other
side and file the right-hand cutters (B) in the opposite
direction.
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.
Improper chain sharpening increases the potential of
kick-back.
Failure to replace or repair a damaged chain can cause
serious injury.
The saw chain is very sharp. Always wear protective
gloves when performing maintenance to the chain.
TOP PLATE FILING ANGLE
See figure 57.
(A) Correct 30° – file holders are marked with guide marks
to align file properly to produce correct top plate angle.
(B) Less than 30° – for cross cutting.
(C) More than 30° – feathered edge dulls quickly.
SIDE PLATE ANGLE
See figure 58.
(D) Correct 80° – produced automatically if you use the
correct diameter file in the file holder.
(E) Hook – "Grabs" and dulls quickly, increases the
potential of kick-back. Results from using a file with a
diameter too small or a file held too low.
(F) Backward slope – needs too much feed pressure,
causes excessive wear to the bar and chain. Results from
using a file with a diameter too large or file held too high.
MAINTAINING DEPTH GAUGE CLEARANCE
See figure 51. See figure 59 - 60.
■ Maintain the depth gauge (A) at a clearance of 0.6 mm
(0.025 inch). Use a depth gauge tool for checking the
English (Original Instructions)
CAUTION
WARNING
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WARNING
depth gauge clearances.
■ Every time the chain is filed, check the depth gauge
clearance.
■ Use a flat file (B) (not provided) and a depth gauge
jointer (C) (not provided) to lower all gauges uniformly.
Use a 0.6 mm (0.025 inch) depth gauge jointer. After
lowering each depth gauge, restore original shape
by rounding the front (D). 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.
MAINTAINING THE GUIDE BAR
See figure 61.
Make sure the chain has stopped before you do any
work on the saw.
Every week of use, reverse the guide bar on the saw to
distribute the wear for maximum bar life. The bar should
be cleaned every day of use and checked for wear and
damage.
Feathering or burring of the bar rails is a normal process
of bar wear. Such faults should be smoothed with a file as
soon as they occur.
A bar with any of the following faults should be replaced:
■ Wear inside the bar rails which permits the chain to lie
over sideways;
■ Bent guide bar;
■ Cracked or broken rails;
■ Spread rails.
In addition, lubricate guide bars (with a sprocket at their
tip) weekly. Using a grease syringe, lubricate weekly in
the lubricating hole.
Turn the guide bar and check that the lubrication holes (A)
and chain groove are free from impurities.
CLEANING THE AIR FILTER
See figure 62 - 64.
NOTE: Always clean the air filter before making any
mixture adjustments of the carburettor.
1. Push down on the knob on the top of the air filter access
cover assembly (20) and rotate counterclockwise to
unlock. Lift the cover straight up to remove; set aside.
2. Before removing the air filter from the carburettor, blow
or brush as much loose dirt and sawdust from around
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