Ryobi CS-1840, Owner'S Operating Manual

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Sprocket
The sprocket is subjected to especially high wear and tear.
If you notice deep wear marks on the teeth, the sprocket
must be replaced. A worn sprocket curtails the service
life of the saw chain. Have the sprocket replaced by an
authorised service centre.
Sharpening the saw chain
WARNING: We advise you to have the deep or important
sharpening carried out by a service agent who is equipped
with an electric sharpener.
When the chain penetrates into wood with difficulty, it
needs sharpening as follows:
1. Put the chain under tension
2. Fasten the bar in a vice so that the chain can slide (Fig.
23).
3. Fasten the file to the file holder and place it on cutter at
35˚ angle (Fig. 24).
4. File with forward strokes only until all the worn out parts
of the cutting edge is removed.
5. Count the number of strokes given to the cutter as
a reference basis and file away the same number of
strokes on all other cutters.
6. If after sharpening a few times, the depth gauge
protrudes from the template, you must reset its level
using a flat file (Fig. 25).
7. Finally, round off the depth gauge (Fig. 26).
Guide bar
The guide bar is subjected to especially severe wear and
tear at the nose and the bottom. To avoid one-sided wear
and tear, turn the guide bar over every time you sharpen
the chain.
1. When you have finished working, clean out the groove
and the oil passages, with a special scraping hook (Fig.
27).
2. Periodically trim the sides of the rails using a flat file. If
not done in the long run, the “feathered edges” might
break away and damage the bar. (Fig. 28).
3. If one rail is higher than the other one, it is necessary to
make it even with a flat file and then smooth them with a
file or fine grain abrasive paper (Fig. 29).