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34 - English
Repair Instructions
WARNING!
The fuel used in the chain saw has
the following hazardous properties:
1. The fluid and its vapour are
poisonous.
2. Can cause skin irritation.
3. Is highly inflammable.
7.14 Carburettor
Description
The gures accompanying this description do not
correspond with the carburettor on the chain saw.
They show only the principle of design and func-
tion.
Design
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 gure 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 gure 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 gure 28.
Fig 28
Fig 29
B
Fig 27