Husqvarna 345E EPA II 用户手册

30 – 

English

The user must only carry out the maintenance and service 
work described in this manual.

Due to existing environmental and emissions legislation your 
chain saw is equipped with movement limiters on the 
carburetor 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.

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The carburetor governs the engine’s speed via the throttle 
control. Air and fuel are mixed in the carburetor. The air/
fuel mixture is adjustable. Correct adjustment is essential 
to get the best performance from the machine.

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The satisfactory operation of a catalytic converter 
depends, among other factors, on the correct adjustment 
of the carburetor. Carefully follow the instructions below, 
using a tachometer as an aid.

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

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The carburetor has three adjustment controls:

   - L = Low speed jet

   - H = High speed jet

   - T = Idle adjustment screw

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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.

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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 carburetor settings are adjusted during testing at 
the factory. Avoid running at a too high speed for extended 
periods 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

When the machine has been ”run-in” the carburetor 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.

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Before any adjustments are made the air filter should be 
clean and the cylinder cover fitted. Adjusting the 
carburetor 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.

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Now start the machine according to the starting 
instructions and let it warm up for 10 minutes.

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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.

IMPORTANT! Any maintenance other than that described in 
this manual must be carried out by your servicing dealer 
(retailer).