Servicing The Carburetor - Stihl 034 Series User Manual

12.4

Servicing the Carburetor

– Remove the carburetor -
It is advisable to check the
serviceability of the fuel pump
whenever the carburetor is removed
for repair.
– Inspect pump diaphragm - see
"Carburetors" handbook, chapter
7.3, Pump Diaphragm
Note:
If the fuel strainer (arrow) in the
pump side of the carburetor body is
dirty, use a scriber to pry it out and
then clean it.
Important:
If the fuel strainer is damaged, fit a
new one.
– If the strainer is dirty, also check
the fuel pickup body and replace
it if necessary - see 12.7.
62
see 12.3
1
2
1
To disassemble the carburetor,
take out the screws (1) of the
metering chamber end cover (2)
and lift away the cover.
Note:
There is no compensator stub (3)
on the end cover (2) of older
carburetors installed in model
034 1 45 945 205 and model
036 X 32 622 640.
Remove the metering diaphragm
and gasket from the carburetor
body or the end cover.
Note:
If the gasket and diaphragm are
stuck, remove them very carefully.
1
3 1
Carefully separate the diaphragm
and gasket.
Note:
The diaphragms are the most
delicate parts of the carburetor.
They are subjected to continuous
alternating stresses and the
material eventually shows signs of
fatigue, i.e. the diaphragms distort
and swell. Check and replace if
necessary.
The inlet needle valve is located
in a recess in the metering
diaphragm chamber. Remove
the round head screw (1).
1
034, 036, 036 QS