Husqvarna 966451906 用户手册

34

 - English

Repair Instructions

The figures accompanying this description do not 

correspond with the carburettor on the chain saw. 

They show only the principle of design and func-

tion.

The carburettor is based on three sub-systems:

•  Metering unit, A.
•  Mixing unit, B.
•  Pump unit, C.

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

tank to the carburettor’s metering unit. One side of 

the pump diaphragm 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 figure 29.

The needles 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 figure 27.

The mixing unit B houses the choke, the throttle 

valve and the diffuser jets. Here air is mixed with 

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

by the ignition spark. See figure 28.

Fig 28

Fig 29

Fig 27