Stiga SP 375 Operator's Manual page 27

MAINTENANCE AND STORAGE
CHAIN CATCHER
This is an important safety device that restrains the
chain if it breaks or degrooves.
Regularly check the condition of the pin and re-
place it if damaged.
NUTS AND SCREWS
Periodically check that all the nuts and screws are
securely tightened and the handgrips are tightly
fastened.
It is recommended that daily inspection before use
and after dropping or other impacts to identify
significant damage or defects.
CLEANING THE AIR FILTER (Fig. 22)
I MPORTANT
sen tial to guarantee the efficiency and duration of
the machine. Do not work with a damaged filter or
without a filter, as this could permanently damage
the engine.
It must be cleaned after every 8-10 working hours.
To clean the filter:
– Release the tab (1) and remove the cover (2).
– Unscrew the knob (2a), remove the filter ele-
ment (3) and tap it gently to remove any dirt and
clean it with a brush if necessary.
– If it is completely clogged, separate the two
parts (3a and 3b) with a screwdriver and wash
them in clean petrol. If you are using compres-
sed air, aim the jet so that it blows from the in-
side towards the outside.
– Reassemble the filter element's two parts pu-
shing on the edges until you hear a click.
– Reassemble the filter element (3) and screw on
the knob (2a).
– Reassemble the cover (2) and fasten the tab (1).
CHECKING THE SPARK PLUG (Fig. 23)
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
Cleaning the air filter is es-
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.
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-
buretion and the engine.
• Tuning minimum speed
WARNING!
when the engine is running idle. If the chain
moves when the engine is running idle, con-
tact your dealer to correctly regulate the en-
gine.
SHARPENING THE CHAIN
WARNING!
saw works safely and efficiently, it is essential
that the cutting components are well-sharp-
ened.
Sharpening is necessary when:
• The sawdust looks like dust.
• Cutting becomes more difcult.
• The cut is not straight.
• Vibrations increase.
• Fuel consumption increases.
WARNING!
ciently sharpened, the kick-back's risk in-
creases.
A specialized centre will sharpen the chain using
the right tools to ensure minimum removal of ma-
terial and even sharpness on all the cutting edges.
If you sharpen the chain yourself, use special
round-section files with the right diameter de-
pending on the type of chain (see "Chain Main-
tenance Table"). You need a certain amount of
skill and experience to avoid damaging the cutting
edges.
Sharpen the chain as follows (Fig. 24):
EN
The chain must not move
To ensure that the chain-
If the chain is not suffi-
15