Jonsered CS 2240 Manuel d'utilisateur télécharger pdf (Page 32)

English – 33

Repair instructions

WARNING!

The fuel used in the chainsaw has

the following hazardous properties:

1. The ﬂuid and its fumes are

poisonous.

2. Can cause skin irritation.

3. Is highly inﬂammable.

7.15 Carburettor

Description

The drawings accompanying this description do not

correspond with the carburettor on the chainsaw.

They only show the principle for the design and

function.

Design

The carburettor is based on three sub-systems:

• The metering unit, A.

• The mixing venturi, B.

• The pump unit, C.

In the pump unit (C), fuel is pumped from the fuel

tank to the metering unit. One side of the pump di-

aphragm is connected to the crankcase and pulses

in time with the pressure changes in the crankcase.

The other side of the diaphragm pumps the fuel

(see gure 24).

The jets and the fuel’s control functions are located

in the metering unit (A). Here the correct quantity

of fuel is adjusted for the actual speed and power

output (see gure 22).

The mixing venturi (B) houses the choke, throttle

valve and diffuser jets. Here air is mixed with the

fuel to give a fuel/air mixture that can be ignited by

the ignition spark (see gure 23).

Fig 22

Fig 23

Fig 24

1 2 ... 27 28 29 30 31 32 33 34 35 36 37 ... 54 55

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Jonsered CS 2240 Manuel d'utilisateur Page 32