Manual Husqvarna 440 II (page 25 of 402) (English, German, Dutch, Danish, French, Italian, Portuguese, Swedish, Spanish, Norwegian, Finnish)

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MAINTENANCE

English – 25

1155355-38 Rev.3 2014-11-24

General

The user must only carry out the maintenance and

service work described in this Operator's Manual. More

extensive work must be carried out by an authorized

service workshop.

Carburettor adjustment

Your Husqvarna product has been designed and

manufactured to speciﬁcations that reduce harmful

emissions.

Function

• The carburettor governs the engine’s speed via the

throttle control. Air and fuel are mixed in the

carburettor. The air/fuel mixture is adjustable. Correct

adjustment is essential to get the best performance

from the machine.

• The T-screw regulates the throttle setting at idle

speed. If the T-screw is turned clockwise this gives a

higher idle speed; turning it anti-clockwise gives a

lower idle speed.

Basic settings and running in

The basic carburettor settings are adjusted during testing

at the factory. Fine adjustment should be carried out by a

skilled technician.

Rec. idle speed: See the Technical data section.

Fine adjustment of the idle speed T

Adjust the idle speed with the T-screw. If it is necessary to

re-adjust, turn the T-screw clockwise while the engine is

running, until the chain starts to rotate. Then turn anti-

clockwise until the chain stops. When the idle speed is

correctly adjusted the engine should run smoothly in

every position and the engine speed should be safely

below the speed at which the chain starts to rotate.

Correctly adjusted carburettor

When the carburettor is correctly adjusted the machine

accelerates without hesitation and 4-cycles a little at full

throttle. It is also important that the chain does not rotate

at idle. If the L-jet is set too lean it may cause starting

difﬁculties and poor acceleration. If the H-jet is set too

lean the machine will have less power, poor acceleration

and could suffer damage to the engine.

Checking, maintaining and

servicing chain saw safety

equipment

Chain brake and front hand guard

Checking brake band wear

Brush off any wood dust, resin and dirt from the chain

brake and clutch drum. Dirt and wear can impair operation

of the brake. (96)

Regularly check that the brake band is at least 0,6 mm

thick at its thinnest point.

Checking the front hand guard

Make sure the front hand guard is not damaged and that

there are no visible defects such as cracks.

Move the front hand guard forwards and back to make

sure it moves freely and that it is securely anchored to the

clutch cover.

Checking the inertia brake release

Place the chain saw, with the engine switched off, on a

stump or other stable surface. Release the front handle

and let the saw fall by its own weight, rotating around the

rear handle towards the stump. (97)

When the bar hits the stump the brake should be

activated. (98)

Checking the brake trigger

Place the chain saw on ﬁrm ground and start it. Make sure

the chain does not touch the ground or any other object.

See the instructions under the heading Start and stop.

(99)

Grasp the chain saw ﬁrmly, wrapping your ﬁngers and

thumbs around the handles.

Apply full throttle and activate the chain brake by tilting

your left wrist forward onto the front hand guard. Do not let

go of the front handle. The chain should stop

immediately. (58)

WARNING! Contact your servicing

dealer, if the idle speed setting cannot be

adjusted so that the chain stops. Do not

use the chain saw until it has been

properly adjusted or repaired.

Note! All service and repair work on the machine

demands special training. This is especially true of the

machine’s safety equipment. If your machine fails any of

the checks described below we recommend that you

take it to your service workshop.

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Husqvarna 440 II Manual

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