Manual Husqvarna 455e Rancher (page 31 of 44) (English)

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MAINTENANCE

English – 31

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

Due to existing environmental and emissions legislation

your chain saw is equipped with movement limiters on the

carburettor adjuster screws. These limit the adjustment

possibilities to a maximum of a 1/2 turn.

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.

• Adjusting the carburettor means that the engine is

adapted to local operating conditions, e.g. climate,

altitude, petrol and the type of 2-stroke oil.

• The carburettor has three adjustment controls:

- L = Low speed jet

- H = High speed jet

- T = Idle adjustment screw

• The L and H-jets are used to adjust the supply of fuel

to match the rate that air is admitted, which is

controlled with the throttle. If they are screwed

clockwise the air/fuel ratio becomes leaner (less fuel)

and if they are turned anti-clockwise the ratio

becomes richer (more fuel). A lean mixture gives a

higher engine speed and a rich mixture gives a lower

engine speed.

• 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. Avoid running at a too high speed during the

ﬁrst 10 hours.

CAUTION! If the chain rotates while idling the T-screw

must be turned anti-clockwise until the chain stops.

Rec. idle speed: 2700 rpm

Fine adjustment

When the machine has been ”run-in” the carburettor

should be ﬁnely adjusted. The ﬁne adjustment should be

carried out by a qualiﬁed person. First adjust the L-jet,

then the idling screw T and then the H-jet.

Changing the type of fuel

Fine tuning may be required if the chain saw, after

changing the type of fuel, performs differently with regard

to starting, acceleration, maximum speed, etc.

Conditions

• Before any adjustments are made the air ﬁlter should

be clean and the cylinder cover ﬁtted. Adjusting the

carburettor while a dirty air ﬁlter is in use will result in

a leaner mixture next time the ﬁlter is cleaned. This

can give rise to serious engine damage.

• Do not attempt to adjust the L and H jets beyond either

stop as this could cause damage.

• Now start the machine according to the starting

instructions and let it warm up for 10 minutes.

• Place the machine on a ﬂat surface so that the bar

points away from you and so that the bar and chain do

not come into contact with the surface or other

objects.

Low speed jet L

Turn the low speed jet L clockwise until it stops. If the

engine accelerates poorly or idles unevenly, turn the low

speed jet L anticlockwise until good acceleration and

idling are achieved.

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.

1/2

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.

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Husqvarna 455e Rancher Manual

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