Husqvarna 340 User Manual download pdf (Page 39)

38 – English

Empty the fuel tank.

Remove the following:

• cylinder cover

• air filter

• clutch cover

• chain and guide bar

• starter assembly

• cable guide

Disconnect the fuel hose from the carburettor.

Fuel tank – removal

WARNING!

The fuel used in chainsaws is

harmful if inhaled, may cause

skin irritation and is highly flam-

mable.

Disconnect the pushrod from the carburettor by

first carefully prising up the spring over the end of

the rod, where it connects to the throttle lever (A).

Then press the throttle lever forwards (B) while

pressing the throttle pushrod backwards (C) and

lifting it off the lever. Withdraw the throttle pushrod

from the tank and lift it upwards without pulling it

through the rubber inlet manifold.

Repair instructions

Fine adjustment of idling speed T

• The idling speed is adjusted using the screw

marked T.

• If adjustment is necessary, screw in the idling

screw T until the chain starts to turn. Then screw it

out until the chain stops moving.

• The idling speed is correctly set when the engine

runs smoothly in all positions and there is a clear

margin to the speed at which the chain starts to

move.

High speed jet H

• The high speed jet H influences the saw power

output and engine speed. If the H jet is set too

weak the saw will over-rev, which could cause

engine damage.

• Run the saw at full throttle for about 10 seconds.

H=1.

• Then screw out the H screw 1/4 turn. H=1 1/4.

• Run the saw again at full throttle for about 10

seconds and listen to the difference in the engine

note. Repeat this procedure again with the H

screw screwed out another 1/4 turn. H=1 1/2.

• You have now run the saw at settings H ± 0, H =

+1/4 and H = +1/2 from the factory setting. At full

throttle the engine will sound different at each

setting.

• The H screw is correctly adjusted when the saw

“burbles” a little at full throttle without any load.

• If there is a lot of smoke from the silencer and the

saw does not run smoothly then the setting is too

rich.

• Screw in the H screw to the setting that sounds

right.

NOTE!

For optimum adjustment, a tachometer

should be used. The recommended maxi-

mum speed should not be exceeded.

Carburettor – correct adjustment

• When the carburettor is correctly adjusted the saw

should accelerate without hesitation and the

engine will burble a little at full throttle without any

load.

• The chain must not turn when idling.

• If the L screw is set too weak this can make the

saw difficult to start and cause poor acceleration.

• If the H screw is set too weak the saw will produce

less power, poor acceleration and there is a risk of

engine damage.

• If either the L or H screws are set too rich it will

cause acceleration problems or too low working

speed.

1 2 ... 34 35 36 37 38 39 40 41 42 43 44 ... 51 52

Comments to this Manuals

No comments

Husqvarna 340 User Manual Page 39

Comments to this Manuals

Related products and manuals for Petrol tool Husqvarna 340