Husqvarna 3120XP 사용자 설명서

English

 – 29

Your Husqvarna product has been designed and 
manufactured to specifications that reduce harmful 
emissions. After the engine has used 8-10 tanks of fuel the 
engine will be run-in. To ensure that it continues to run at peak 
performance and to minimise harmful exhaust emissions 
after the running-in period, ask your dealer/service workshop 
(who will have a rev counter at their disposal) to adjust your 
carburettor.

•

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 setting of the carburettor means that the engine is 
adepted to local conditions, for example, the climate, 
altitude, fuel and the type of 2-stroke oil.

•

The carburettor has two adjustment controls: 

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L = Low speed jet

-

T = Idle adjustment screw (Maximum speed is 
controlled by a fixed jet/electronic speed governor).

•

The amount of fuel that is mixed with the air admitted by 
the throttle opening is adjusted using the low speed jet. If 
this is turned clockwise it gives a leaner air/fuel mixture 
(less fuel) and if it is turned anti-clockwise it gives a richer 
air/fuel mixture (more fuel). A leaner mixture gives a 
higher engine speed, while a richer 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.

The basic carburettor settings are adjusted during testing at 
the factory. The basic setting is richer than the optimal setting 
and should be kept during the machine’s first working hours. 
Thereafter the carburetor should be finely adjusted. Fine 
adjustment should be carried out by a skilled technician.

NOTE! If the chain rotate while idling the T screw should be 
adjusted counter-clockwise until it stops.

Recommended idling speed: 2 500 rpm.

When the saw has been ”run-in” the carburettor should be 
finely adjusted. The fine adjustment should be carried out by 
qualified person.  The L-needle is adjusted first, then the idling 
screw T. 

•

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.

•

Turn the low speed jet carefully clockwise until it bottoms. 
Now turn it one turn anti-clockwise. The carburettor is now 
set to L = 1.

•

Now start the machine according to the starting 
instructions and let it warm up for 10 minutes. CAUTION! 
If the chain rotates while idling the T-screw must be 
turned anti-clockwise until the chain stops.

•

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.

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.

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 counter-clockwise 
until the chain stops. A correctly adjusted idle speed setting 
occurs when the engine runs smoothly in every position. It 
should also be good margin to the rpm when the chain starts 
to rotate.

L

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