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–
If necessary, clean the sponge pre-filter (3a)
and filtering element (3) with hot soapy water
or detergent or clean with a jet of compressed
air.
–
Eliminate all sawdust and dirt residue in the
filter housing (4) being careful it does not pe-
netrate into the suction duct (5).
–
Reassemble the filtering element (3) and
sponge pre-filter (3a) only when thoroughly
dry.
–
Remount the cover (2).
Models 46 and 52
To clean the filter (Fig. 23):
–
Move the front hand guard forward.
–
Using a screwdriver, remove the three side
springs (1) and the cover (2).
–
Extract the starter knob (3) and, using pliers,
extract the two side stops (4).
–
Remove the filter element (5) and tap it gently
to remove any dirt and, if necessary, clean it
with hot soapy water or detergent. If you are
using compressed air, aim the jet so that it
blows from the inside towards the outside.
–
Eliminate all sawdust and dirt residue in the
filter housing (6) being careful it does not pe-
netrate into the suction duct (7).
–
Reassemble the filter element (5) only when
thoroughly dry, being careful to perfectly line
up the two side protrusions (8) with the filter
housing protrusions.
–
Reassemble the two side stops (4).
–
Reassemble the cover (2) and hook the three
springs (1).
CHECKING THE SPARK PLUG (Fig. 24)
The spark plug can be accessed by removing the
air filter cover.
Periodically remove and clean the spark plug
using a metal brush to get rid of any deposits.
Check and reset the correct distance between the
electrodes.
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.
TUNING THE CARBURETTOR
The carburettor is tuned by the manufacturer to
achieve maximum performance in all situations,
with a minimum emission of toxic gas in compli-
ance with the regulations in force.
44
8. MAINTENANCE AND STORAGE
When performance is poor, first check that the
chain runs smoothly and the bar rails are not dis-
torted, then contact your dealer to check the car-
burettor and the engine.
Tuning minimum speed
CAUTION!
The chain must not move when the
engine is running idle. If the chain mo-
ves when the engine is running idle,
contact your dealer to correctly regu-
late the engine.
SHARPENING THE CHAIN
CAUTION!
To ensure that the chain saw works
safely and efficiently, it is essential
that the cutting components are well
sharpened.
Sharpening is necessary when:
The sawdust looks like dust.
Cutting becomes more difficult.
The cut is not straight.
Vibrations increase.
Fuel consumption increases.
CAUTION!
If the chain is not sufficiently sharpe-
ned, the risk of kick-back increases.
A specialist centre will sharpen the chain using the
right tools to ensure minimum removal of material
and even sharpness on all the cutting edges.
If you sharpen the chain yourself, use special
round-section files with the right diameter depen-
ding on the type of chain (see
table). You need a certain amount of skill and ex-
perience to avoid damaging the cutting edges.
Sharpen the chain as follows (Fig. 25):
–
Switch off the engine, release the chain brake
and secure the bar with the chain in a vice so
that the chain can run smoothly.
–
Tighten the chain if it is loose.
–
Mount the file in the guide and then insert it in
the tooth at a constant angle from the cutting
edge.
–
Sharpen in a forward motion a few times and
repeat this on all the cutting edges facing the
same way (right or left).
–
Turn the bar over in the vice and repeat on all
the other cutting edges.
Chain maintenance
469601_a
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