Stiga SP 316 C Manual De Instrucciones página 183

Periodically remove and clean the
spark plug using a metal brush to get
rid of any deposits (Fig. 35.A).
Check and reset the correct distance
between the electrodes (Fig. 35.B).
Replace the spark plug and fasten it
firmly using the supplied wrench.
The spark plug must be replaced with one
with the same characteristics whenever the
electrodes have burnt or the insulation has worn,
and in any case every 100 working hours.
8.5 STARTER CABLE
The starter rope must be replaced by
your dealer or Authorised Service Centre
as soon as it shows signs of wear.
8.6 MAINTENANCE OF THE
TOOTHED CHAIN
To ensure that the chainsaw works
safely and efficiently, it is essential that
the cutting means are well-sharpened.
Chain sharpening is necessary when:
– the sawdust looks like dust.
– cutting becomes more difficult.
– the cut is not straight.
– vibrations increase.
– fuel consumption increases.
Kickback may occur if the chain
is not sufficiently sharpened
IMPORTANT It is recommended to have
an authorised service centre or dealer
sharpen the chain using the right tools to
ensure minimum removal of material and
even sharpness on all the cutting edges.
8.6.1 Chain sharpening
If you sharpen the chain yourself, use special
round-section files with the right diameter
depending on the type of chain (see "Chain
Maintenance Table", chap. 14). You need
a certain amount of skill and experience
to avoid damaging the cutting edges.
Sharpen the chain as follows:
1. Stop the machine (par. 6.7).
2. Disengage the chain brake (par. 5.7).
3. Secure the bar firmly, with the chain
mounted, in a suitable vice (Fig. 36.A),
making sure that the chain can run freely.
4. Tighten the chain if it is loose (par. 6.1.3).
5. Insert the file in the tooth at a constant
angle from the cutting edge (Fig.
36.B). Using a sharpening plate makes
using the file easier (Fig. 36.C).
6. Sharpen in a forward motion a few times
and repeat this on all the cutting edges
facing the same way (right or left).
7. Turn the bar over in the vice and repeat
on all the other cutting edges.
8. Check that the limiter tooth (Fig. 36.D)
complies with the levels indicated in
the "Chain Maintenance Table" (Chap.
14) and file any projecting parts with
a flat file, rounding off the edge.
9. After sharpening, remove all traces of filing
and dust and lubricate the chain in an oil bath.
8.6.2 Replacing the toothed chain
Replace the chain whenever:
– the length of the cutting edges reduces
to 5 mm or less (Fig. 36.E);
– there is too much play between
the links and the rivets.
– the cutting speed is too slow and the
repeated sharpening does not improve
the cutting speed. The chain is worn.
IMPORTANT After replacing the chain,
its tension level must be checked more
frequently due to settling of the chain.
8.7 GUIDE BAR MAINTENANCE
NOTE Any work on the guide bar requires
specific experience and special tools in order
to achieve top workmanship standards; for
safety purposes, we recommend you contact
your dealer to ensure work is done correctly.
To avoid asymmetrical wear on the bar,
make sure it is turned over periodically.
To keep the bar in perfect working
order, proceed as follows:
1. Grease the bearings on the nose sprocket
(if present) with the syringe (not included).
2. Clean the bar groove with the scraper
(not included) (Fig. 37.A);
3. Clean the lubrication holes (Fig. 37.B);
4. With a flat file (not included), remove burr
from the edges and level off the guides.
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