Manual Stiga SP 375Q (page 41 of 460) (All languages)

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MAINTENANCE AND STORAGE 15

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)

Cleaning the air filter is es-

sential 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 compressed air, aim

the jet so that it blows from the inside towards the

outside.

– Reassemble the filter element’s two parts push-

ing 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.

IMPORTANT

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.

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

The chain must not move

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

To ensure that the chain-

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 difficult.

• The cut is not straight.

• Vibrations increase.

• Fuel consumption increases.

If the chain is not suffi-

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 Mainte-

nance Table”). You need a certain amount of skill

and experience to avoid damaging the cutting

edges.

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Stiga SP 375Q Manual

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